Operating Manual

Amplifier System
MGA II

with Digital Display

DA12

B0599-3.4 en
HBM
 3

Contents

A Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-1
1 Notes on documentation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-2
2 MGA II housings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-3
3 Structure of the MGA II device . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-5
3.1 Control elements for the digital indicator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-7
3.2 Control elements for the amplifier plug-in units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-8
3.3 Component location diagrams, connection boards . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-9
3.4 Component location diagrams ME10, ME30, ME50, ME50S6 . . . . . . . . . . . . . . . . . . A-12
4 Conditions on site . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-13
5 Maintenance and cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-14
B Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-1
1 Mains connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-2
1.1 Shielding design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-3
2 Connecting transducers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-4
2.1 Connect strain-gauge full bridge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-5
2.2 Connect inductive half bridge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-6
2.3 Intrinsically safe transducer port . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-7
2.3.1 Electrical connection to AP05 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-8
3 Outputs and remotes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-10
3.1 Connection boards AP01, AP03, AP05, AP11 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-10
4 Synchronisation (ME30 and ME50 only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-12
C Commissioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-1
1 Commissioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-2
1.1 Devices in the desktop housing and module frame . . . . . . . . . . . . . . . . . . . . . . . . . . . C-3
1.2 Switching on . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-4
MGA II
4

D Balancing/Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-1
1 Balancing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-2
1.1 Excitation voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-2
1.2 Zero balancing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-4
2 Setting a range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-5
3 Calibrating the measuring chain . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-9
4 Zero operating mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-11
5 Measurement frequency range /Cut-off frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-12
E Technical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . E-1
1 MGA II System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . E-2
1.1 System device . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . E-2
1.2 DA12 Digital indicator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . E-3
1.3 EM001 End-phase module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . E-4
2 Amplifier plug-in unit ME10 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . E-5
3 Amplifier plug-in unit ME10S6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . E-7
4 Amplifier plug-in unit ME30 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . E-8
5 Amplifier plug-in unit ME50 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . E-10
6 Amplifier plug-in unit ME50S6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . E-12
7 Connection boards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . E-14
F Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . F-1

MGA II
 5

Safety instructions

Use in accordance with the regulations

The amplifier system is to be used exclusively for measurement tasks and directly related
control tasks. Use for any purpose other than the above shall be deemed to be not in accor-
dance with the regulations.
To ensure safe operation, the device may only be operated in accordance with the informa-
tion given in the User Manual. It is also essential to comply with the legal and safety require-
ments for the application concerned during use. The same applies to the use of accessories.

General dangers of failing to follow the safety instructions

The amplifier system is a state-of-the-art device and is safe to operate. The device may
give rise to further dangers if it is inappropriately installed and operated by untrained person-
nel.
Any person instructed to carry out installation, commissioning, maintenance or repair of the
device must have read and understood the User Manual and in particular the technical
safety instructions.

Residual dangers
The scope of supply and list of components provided with the amplifier system cover only
part of the scope of measurement technology. In addition, equipment planners, installers and
operators should plan, implement and respond to the safety engineering considerations of
measurement technology in such a way as to minimise residual dangers. Prevailing regula-
tions must be complied with at all times. There must be reference to the residual dangers
connected with measurement technology.
After setting up and password protected activities, care must be taken to ensure that any
control units that may be connected remain in a safe and secure state until the switching
behaviour of the amplifier system has been checked.

MGA II
6

Any risk of residual dangers when working with the amplifier system is pointed out in this
introduction by means of the following symbols:

Symbol: CAUTION
Meaning: Potentially dangerous situation
Warns of a potentially dangerous situation in which failure to comply with safety require-
ments could result in damage to property or some form of physical injury.

Symbol: NOTE
Means that important information about the product or its handling is being given.

Symbol:

Meaning: CE mark

The CE mark enables the manufacturer to guarantee that the product complies with the re-
quirements of the relevant EC guidelines (the Declaration of Conformity can be found at
http://www.hbm.com/HBMdoc ).

MGA II
 7

Information about CE labelling

The devices in the MGA II II II range carry the CE label and satisfy the requirements of EU
guideline 89/336/EWG “Elektromagnetic compatibility” andmits listed harmonised European
standards (EN).
The EU declarations of conformity according to the above mentioned EU guideline , Article
10, for the relevant authorities are available from:

HOTTINGER BALDWIN MESSTECHNIK GMBH

Im Tiefen See 45
D-64239 Darmstadt

The MGA II II II system devices are designed for industrial and domestic applications (do-
mestic area, business and trade, small scale enterprises) and fulfil the requirements for in-
terference immunity according to EN 50 082-2: 1995 and EN 50 082-1: 1992 and for em-
mission according to EN 55 011: 1991 and EN 55 022: 1994 respectively.

In addition to the details given in the operating instructions, the following information should
be taken into account when operating the device:
The connecting cable must be screened and the screen must be connected flat on the
connector housing.
If system components (e.g. plug-in cards) are supplied separately, then the operator must
ensure that they are used in a HBM system housing or in an equivalent housing.

In addition to the details given in the “Technical Data” in the operating instructions,
the following values also apply:

Accuracy class
Max. deviation under the influence of strong electromagnetic ME10 ME30 ME50
fields according to EN50082-2
10 V/m, 80 MHz ...1 GHz 2% 0.1 % 0.1 %
10 V , 150 kHz...80 MHz 2% 0.1 % 0.1 %

MGA II
8

Working safely
Error messages should only be acknowledged if the cause of the error is removed and no
further danger exists.
The instrument complies with the safety requirements of DIN EN 61010, Part 1 (VDE 0411,
Part 1); Protection Class I.
To ensure adequate immunity from interference, use only Greenline shielded ducting (see
HBM offprint ”Greenline shielding design, EMC-compliant measuring cable; G36.35.0).

Conversions and modifications

The MP55 module must not be modified from the design or safety engineering point of view
except with our express agreement. Any modification shall exclude all liability on our part for
any damage resulting therefrom.
In particular, any repair or soldering work on motherboards is prohibited. When exchanging
any modules, only original HBM parts must be used.

Qualified personnel
This instrument is only to be installed and used by qualified personnel strictly in accordance
with the technical data and with the safety rules and regulations which follow. It is also es-
sential to comply with the appropriate legal and safety regulations for the application con-
cerned during use. The same applies to the use of accessories.
Qualified personnel means persons entrusted with the installation, assembly, commissioning
and operation of the product who possess the appropriate qualifications for their function.
Maintenance and repair work on an open device with the power on must only be carried out
by trained personnel who are aware of the dangers involved.

MGA II
 9

Safety requirements
Before commissioning, find out whether the mains voltage and current type specified on the
identification plate match the mains voltage and current type at the place of use, and whe-
ther the circuit being used is adequately protected.
Insert the mains plug only into a socket with a protection switch (Protection Class I). When
connecting electrical devices to low voltage: connect to extra-low safety voltage only (safety
transformer in accordance with DINVDE 0551/ EN60742).
Before you open the device, make sure it is switched off; remove the mains plug from the
socket.
Never pull the mains plug from the socket by the mains cable.
Do not operate the device, if the mains cable is damaged.
If an amplifier channel is to be withdrawn, close off the plug-in unit with a blanking plate.
Built-in devices must only ever be operated whilst they are within the housing provided for
them.
The device complies with the safety requirements of DIN EN 61010-Part 1 (VDE 0411-Part
1); Protection Class I.

MGA II
10

MGA II
Introduction Ý Notes on documentation A-1

A Introduction

MGA II
A-2 Introduction Ý Notes on documentation

1 Notes on documentation

This Manual contains all the information you need to operate the MGA II.

There are several guidelines available to you:

• Each Section starts with a list of its contents.

• The header tells you which Section or sub-section you are currently reading.
Example:

Connections Ý Transducer B-15

• The page numbering is linked to capital letters which correspond to the Section headings.

MGA II
Introduction Ý MGA II housings A-3

2 MGA II housings

The MGA II System is supplied in various housings:

Desktop housing TG 005 Desktop housing TG 007 (458x171x367)

(255x171x367)

Desktop housing TG011 (173x171x367) 19” module frame ER 007 (483x132.5x367)

(W x H x D in mm)

Desktop housing Module frame Maximum number of channels Supply voltage

TG005 - 6 230 V (115 V)
TG007 - 12 230 V (115 V)
TG011 - 2 230 V (115 V)
- ER007 12 230 V (115 V)

MGA II
A-4 Introduction Ý MGA II housings

All basic versions of the device consist of the following components:

• Housing
• DA12 digital indicators (indication limit 19.999)
• Amplifier plug-in units (ME10 ....)
• Connection boards (AP01, AP03 ... )
• Power pack

Accessories

• Kab133A adapter cable; 0.3 m, (D-connector to MS coupler socket)

• Kab251-05 synchronisation cable; 0.5 m, (2x 5-pin cable plugs)
• DB-25P connecting plug (25-pin cable plug with housing and fixing accessories for
output and control signals)
• DB-15P connecting plug (15-pin cable plug with housing and fixing accessories for
transducer port)
• D25-BNC/2 connecting plug; with BNC jack
• EM001 end-phase module, switchable to impressed voltage or impressed current; can be
plugged on to connection boards

MGA II
Introduction Ý Structure of the MGA II device A-5

3 Structure of the MGA II device

Connection boards (AP01, AP02, AP05, AP11) End-phase module (option)

Power
pack

DA12 digital indicator

Amplifier plug-in units

(ME10, ME30, ME50, ME50S6)

Fig. 3.1: Overall structure of the MGA II device

MGA II
A-6 Introduction Ý Structure of the MGA II device

Synchronisation

Earthing switch

SY02

Output

Transducer port

AP01 Blanking
Connection plates Mains
boards connection

Chassis ground

Fig. 3.2: Rear of device (section)

MGA II
Introduction Ý Structure of the MGA II device A-7

3.1 Control elements for the digital indicator

Digital display
4 1/2-position 7-segment display

Channel-selector switch
Selection of the required
measurement channel

Mains
switch

Fig. 3.3: DA12 digital indicator

The four-and-a-half-position digital indicator displays the nominal value at 10 V. This corresponds to the HBM
amplifiers’ output area.
The decimal point is selectable/disconnectable via plug-in jumpers St21/St22 on the DA12 motherboard.

Select decimal point: DA12 motherboard Dec.-point

position
Display St22 Free
S Unscrew DA12 front panel 10000.V
S Lift cap off the rotary switch and unscrew 1000.V
100.V
rotary switch with socket spanner 10.V
S Unscrew motherboards; access to ST21/22 free 1.V
P21

Remove jumper: no decimal point

St21
Plug jumper in: Decimal point can be moved to any Factory
setting
position

S22

MGA II
A-8 Introduction Ý Structure of the MGA II device

3.2 Control elements for the amplifier plug-in units

Amplifier type
ME10 ME10: DC amplifier for strain-gauge transducers
(measurement-frequency range 0...10 kHz)
ME30: 600 Hz carrier-frequency amplifier for strain gauge transducers
ME50: 4.8 kHz carrier-frequency amplifier for inductive transducers
ME50S6: 4.8 kHz carrier-frequency amplifier for strain-gauge transducers

Range fine
Fine balancing of the ranges
Operating mode
Selection of Zero/Measure/Calibrate operating modes
Zero balancing fine
Fine balancing of the zero point

Zero balancing coarse

Coarse balancing of the zero point

Polarity
Setting the polarity of the balance voltage

Fig. 3.4: Front panel, amplifier plug-in unit

MGA II
Introduction Ý Structure of the MGA II device A-9

3.3 Component location diagrams, connection boards

Bu2
Base for EM001
end-phase module

0...20

S1 S2
Bu1

Fig. 3.5: Connection board AP01

MGA II
A-10 Introduction Ý Structure of the MGA II device

Base for EM001

end-phase module
S301-1

S302-1

S304-2
S303-2

Fig. 3.6: Connection board AP05

MGA II
Introduction Ý Structure of the MGA II device A-11

Base for EM001

end-phase module

S302-1 S304-2 S301-1

S303-2

Fig. 3.7: Connection board AP11

MGA II
A-12 Introduction Ý Structure of the MGA II device

3.4 Component location diagrams ME10, ME30, ME50,

ME50S6

S26 S27
BR3/BR4

St21

P21 S283)
P22
S21
P23
S22
S23
S292)

S251) S254)
S24 S252)

Fig. 3.8: Component location diagram ME10, ME30, ME50, ME50S6

1) with ME30 and ME50S6

2) on ME50
3) not on ME10
4) on ME10

MGA II
Introduction Ý Conditions on site A-13

4 Conditions on site

CAUTION
D Protect desktop devices from moisture or atmospheric influences such as rain, snow, etc.
D Ensure that the ventilation openings on the sides, the openings for the electric fan on the
back of the device and the openings on the underside of the device are not covered up.
D Protect the device from direct sunlight.
D Comply with the maximum permitted ambient temperatures specified for the system
devices in the Technical Data.
D For installation in 19” fitted cupboards, because of the poorer heat dissipation suitable
steps must be taken to ensure that the maximum permissible ambient temperature is not
exceeded. In all cases we recommend forced exhaust ventilation and, in particularly
critical cases, clearances above and below the module frame.
D Permissible relative humidity at 31 °C is 80 % (non-condensing), reducing linearly to
50 % at 40 °C.
D The devices are classed as overvoltage category II, pollution grade 2 equipment.

MGA II
A-14 Introduction Ý Maintenance and cleaning

5 Maintenance and cleaning

MGA II system devices are maintenance-free. Please note the following points when
cleaning the housing:

CAUTION
Withdraw the mains plug from the socket before carrying out any cleaning.

D Clean the housing with a soft, slightly damp (not wet!) cloth. You should on no
account use solvent, since it may damage the labelling on the front panel and
the indicator box.

D When cleaning, ensure that no liquid gets into the device or connections.

MGA II
Connections Ý Mains and battery operation B-1

B Connections

MGA II
B-2 Connections Ý Mains and battery operation

1 Mains connection

The NT010 power pack is designed for connection to 230 V (115 V) and
for the maximum configuration of 16 channels. It adapts automatically
to the 115 V/230 V mains supply voltage. The fan on the power pack is
temperature-controlled and automatically cuts out if necessary. The
Housing power pack is protected with an internal 3.15 A/ T micro-fuse.
earthing
system

CAUTION
The power pack fuse may be changed only by the manufacturer’s
service personnel.

Earthing switch
The earthing switch, in the factory setting ( ), links zero operating
voltage to the protection circuit. If external devices (e.g. transducers,
computers) already make this link, and this causes earth-circuits to
occur (hum-pickup), the earthing switch must be opened ( ).

Connecting to the mains

Earthing switch

MGA II
Connections Ý Shielding design B-3

1.1 Shielding design

GREENLINE
Greenline shielding design:
wh

bk HBM has developed the Greenline shielding design as an effective

means of improved protection against electromagnetic interference.
rd
The cable shielding is formed in such a way that the whole of the
bu measuring system is completely enclosed in a Faraday cage.
gn

gy

ye
NOTE
In the case of connection boards fitted with a terminal block
(AP05) please connect the cable shielding to the eyelet on the
connection board.

MGA II
 B-4 Connections Ý Transducers

2 Connecting transducers

Measuring signal (+) When using double-width connection boards (AP03, 05) only slots 1, 3,
Excitation voltage (-) 5, 7, 9 and 11 can be occupied by an amplifier.
2
Excitation voltage (+)
IMPORTANT: Transducers with four-wire connection
Measuring signal (-)
1 4
If you are connecting a transducer with 4-wire cable, you must connect
Cable shielding 1)
3 the sensor circuit to the appropriate bridge excitation circuit in the
Sensor circuit (+) transducer connector (sensor circuit (-) to excitation voltage (-) and
Feedback Sensor circuit (-) sensor circuit (+) to excitation voltage (+)*).
bridges AP01 connection board: connect 5 with 12 and bridge 6 with 13.
AP03 connection board: connect B with G and bridge C with F.
1)
Any cable extension must only ever be carried out in six-wire
see page B-3
connection. Avoid rearranging the transducers with the device switched
on. Should this however occur, correct functioning is obtained by briefly
switching the device ON and OFF.
*) For cable lengths >50 m, one resistor with half the bridge resistance value
(BR/2) must be wired into the transducer in place of each feedback bridge. If
the transducers are calibrated in six-wire connection, the resistors must be
wired directly into the sensor circuit.

Which transducer to connect to which amplifier?

ME10: DC amplifier for strain-gage transducers
(measuring frequency 0...10 kHz)
ME30: 600 Hz CF-amplifier for strain-gage transducers
ME50: 4.8 kHz CF amplifier for inductive transducers
ME50S6:4.8 kHz CF amplifier for strain-gage transducers

NOTE
The accuracy of a measurement channel can be affected by
adjacent channels, if no transducers have been connected to
them. In this case, we recommend closing the bridges for the
sensor circuits of the excitation voltage for all channels that have
not been connected (clip on dummy plug with appropriate
bridges).

MGA II
Connections Ý Transducers B-5

2.1 Connect strain-gage full bridge

Amplifier: ME10, ME30, AP01 AP03 AP05 AP11

ME50S6

1
2
1 9 3
A 4
F
5 1 6
B E
15 G 6 2 5
8 C D 4
7 3
8

wh 8 1
Measuring signal (+) A 1
bk Excitation voltage (-) 5 B 2 2
2 bu Excitation voltage (+) 6 C 3 3
rd
Measuring signal (-) 15 D 4 4
1 4
ye Case Case Case
Cable shielding 1) Case
3
gn
Sensor circuit (+) 13 F 6 5
gy 6
Sensor circuit (-) 12 G 7
1) see page B-3

Wire colours: wh= white; bk= black; bu= blue; rd= red; ye= yellow; gn= green; gy= grey

MGA II
B-6 Connections Ý Transducers

2.2 Connect inductive half bridge

Amplifier: ME50 AP01 AP03 AP11

1 9
A F
1 6
B E
G 2 5
8 15 C D 4
3

wh
Measuring signal (+) 8 A 1
bk Excitation voltage (-) 5 B 2
2 bu Excitation voltage (+) 6 C 3

1
ye
Cable shielding 1) Case Case Case
3
gn
Sensor circuit (+) 13 F 5
gy
Sensor circuit (-) 12 G 6
1) see page B-3

Wire colours: wh= white; bk= black; bu= blue; rd= red; ye= yellow; gn= green; gy= grey

MGA II
Connections Ý Transducers B-7

2.3 Intrinsically safe transducer port

The AP05 connection board is used for connecting strain-gage transducers which are used
through an intrinsically safe EEx(ib) circuit in areas subject to explosion hazard.
Three safety barriers (double safety barriers for 6 lines) separate the intrinsically-safe from
the non-intrinsically-safe circuit.
Strain-gage full bridges can be connected to the AP05 connection board.
The following values apply to the intrinsically safe circuit:

Strain-gage full bridge:

Voltage:
22 V
Current:
193 mA
Power:
1.06 W

Attachable transducer resistors in the intrinsically safe circuit

ME30 UB=5 V 300...4000 Ω
UB= 2.5 V 100... 4000 Ω
ME10 UB=10 V 600...4000 Ω
UB= 5 V 175... 4000 Ω
UB= 2.5 V 60... 4000 Ω

MGA II
B-8 Connections Ý Transducers

2.3.1 Electrical connection to AP05

In the case of strain-gage full bridges a six-wire connection must be used to attach the
transducer. A 6-core cable with light-blue oversheath to identify the intrinsically safe circuit
is used to connect the transducer.
The transducer’s Inspection Certificate should be consulted to determine whether it is
suitable for the intrinsically-safe circuit present with the values specified in the Technical
Data.

The PEL (potential equalisation line) terminals of the Zener barriers must be connected by
the shortest path to the potential equalisation (cable shielding) in the area subject to
explosion hazard. The cross-section of this link must at least match the conductivity of
1.5 mm2 copper.
If the voltage between the PEL earthing point and the operating-voltage zero point of the
amplifier exceeds 1..2 V, additional connection of protective conductor and operating zero
may result in malfunctions in the amplifier. This voltage should therefore be kept as low as
possible by appropriate choice of protective conductor.

NOTE
Further guidance on transducer connection in areas subject to explosion hazard will
be found in HBM publications.
“SD01A safety barriers” for strain-gage full bridges

MGA II
Connections Ý Transducers B-9

Intrinsically safe transducer port, strain-gage full bridge

UE max. = 8.8 V (6.3 V effective)

Sensor circuit

Excitation circuit

Zero operating voltage

Excitation circuit

Sensor circuit

Measurement diagonal

Ex-risk area
UE max. = 1.4 V (1 V effective)

RK = Cable resistance RZ1 = 158.5 kΩ (Barrier resistance)

RB = Bridge resistance RZ2 = 1.5 kΩ (Barrier resistance)

RE = Earth resistance 15 kΩ RZ3 = 155 kΩ (Barrier resistance)

In normal operation no current flows through the Zener diodes in the Zener barriers or - if cable and transducer are
of symmetrical construction - through RE. The potential equalisation line (PEL) is thus kept to the operating-zero
potential. If malfunctions occur, connect the zero operating voltage to the PEL earthing point through a separate
line.

MGA II
B-10 Connections Ý Outputs and remotes

3 Outputs and remotes

3.1 Connection boards AP01, AP03, AP05, AP11

Connection boards for the amplifier channels are plugged in at the back
of the desktop housing. The jacks on these connection boards provide
you not only with connection facilities for the transducer, but also with
several output and control signals, depending on the chosen option.
1 14 The connection boards contain a 25-pin jack designated Bu2. The pin
assignment of the jack for connection boards AP01, 05, 11, is shown in
the following diagram.

13 25 1 Zero operating voltage

2
50kΩ
Bu 2 21 Zero balancing, external
Outputs 5
OUTPUT
17
5kΩ Range 1 fine, external
18
19
3 Operating mode Calibrate; to
4 Switch MB1/MB2; to
6 Operating mode ZERO; to
11 Option: voltage or current output;
switchable 10 V; Ia=20 mA (+4...+20 mA)
13 Output Ua=10 V; Ra>5 kΩ
16
22
23
24
25

Fig. B 1: Bu2 pin assignment

MGA II
Connections Ý Outputs and remotes B-11

AP01/ AP03 The chart above left shows the arrangement of switches on the
AP01/AP03 motherboard. Each end-phase module is assigned a
Bu5 sliding switch (e.g. S302-1) and a plug-in jumper. The maximum
End-phase module possible number of EM001 end-phase modules is two.
The switch position necessary for the required output signal is shown in
Bu3 the table underneath.
End-phase module

S1 S2

0...20

Sliding switch Plug-in jumpers

required
output Switch position
S1 ST
+10 V S2 ST
Any

S1 ST
+20 mA S2 ST

+4... S1 ST
S2
+20 mA ST

MGA II
B-12 Connecting Ý Synchronising

4 Synchronisation (ME30 and ME50 only)

SY 02 Synchronisation is advisable when

• the transducer cables of several devices have been laid side by side
SYNCHR
.
• the sensors are unshielded and bunched close together
Synchronisation prevents beat interference due to carrier-frequency
differences. All amplifiers within a device are basically synchronized
MASTER
with a built-in master oscillator.
D
D Switch Synchronising 2 devices
SLAVE

• Connect two devices through one of the SYNCHR. jacks (1-Kab

251) on the SY02 plug-in unit.
• Set the Master/Slave switch on the plug-in unit SY02 to MASTER
for one device and to SLAVE for the other.
Synchronisation jack
In addition the switch S28 on the amplifier PCB must be set
(1st channel) accordingly:

Setting S28

Slave

Master
ME30, ME50

S28 R37 R24

If in the the case of the MASTER amplifier no transducer is connected

by six-core circuit, the bridge supply-voltage leads must be connected
to the sensor conductor by jumpers at the connecting plug or by internal
100 kOhm resistors on the amplifier circuit-board.
• In the case of ME30 and ME50: solder bridge between R24 and R37

MGA II
Connecting Ý Synchronising B-13

Synchronising more than 2 devices (with ME30 and ME50)

SY 02 Device 1
You can synchronise any number of devices via the SYNCHR. jacks.
• Set the switch SY02 on the first device to MASTER, likewise S28 on
M
the amplifier motherboard (Channel 1).

S S28 ME30, ME50

Kab 1-Kab251-0.5
S28
MASTER

• On all succeeding amplifier plug-in units set the switch S28 to

SLAVE, likewise switch SY02 on the succeeding devices.

S28 ME30, ME50

SY 02
S28
SLAVE
M

• Connect all devices together via the synchronisation jacks.

If the device is not to be synchronised:
Device 2 • on the first device set the SY02 switch to MASTER
• switch S28 (Channel 1) to MASTER
Use the synchronisation cable Kab251-0.5 (Accessories).
In the case of the ME10 amplifier synchronisation is not possible (no
CF amplifier).

Device 3

MGA II
B-14 Connecting Ý Synchronising

MGA II
Commissioning C-1

C Commissioning

MGA II
C-2 Commissioning Ý Switching on

1 Commissioning

This chapter shows you the necessary steps to take in order to make your measuring system
(amplifier system and transducer) ready for use.
You will then be in a position to carry out a function test of all components. The various steps
are deliberately explained in very general terms, without going into detail about specific
transducers or amplifier plug-in units. However, it is very easy to apply the description to
your own measuring system. In some instances - especially to do with connecting
transducers - reference will be made to later chapters. We also warn about certain errors
which can typically occur during commissioning.
After initially commissioning and adapting the amplifier plug-in unit to your transducer you
are in a position to get to know the other functions and facilities of the MGA II Amplifier
System.

MGA II
Commissioning Ý Switching on C-3

1.1 Devices in the desktop housing and module frame

• If you have not yet received your complete amplifier system, you should take note of the
following points when putting the system together:

- The amplifier plug-in units are inserted from the front, the associated connection boards
from the back.

It is important to ensure correct allocation during this step:

- If using wide connection boards (8 divisions), you must plug these into slots 1, 3, 5 etc.
Slots 2, 4, 6 etc. on the front panel must be fitted with blanking plates.

• On safety grounds all unused slots (amplifiers or connection boards) must be covered
over with blanking plates.
• Check that all amplifiers and connection boards are firmly plugged in.
• Connect the device to the mains supply with the mains cable provided.
• Connect your transducer to the jack provided on the connection board (reference BU01).
If you use a cable you have made up yourself, please adhere to the pin assignment for
your transducer as shown in Section B Connections.

Also observe the safety instructions.

MGA II
C-4 Commissioning Ý Switching on

1.2 Switching on

• Switch the device on with the POWER button on its front panel.

When the DA12 is initialized (at which time all LEDs light up for a
moment) it notes the components present. If no transducer is
connected, an overflow is displayed.

Switching on

MGA II
Balancing/Range D-1

D Balancing/Range

MGA II
D-2 Balancing/Range Ý Zero balancing

1 Balancing

Before measurement takes place the amplifier must be matched to the transducer and balanced.

1.1 Excitation voltage

Factory settings:

ME10 ME30 ME50 ME50S6

5V 5V 2.5 V 2.5 V

UB = 5 V: Default setting for strain gage transducers

UB = 2.5 V: Rated excitation voltage for HBM inductive transducers

UB = 1 V: For inductive transducers with high output signals

or when using the ME50 with safety
barriers or with very small sensors.
You can alter the bridge supply voltage using the S25 switch on the
amplifier motherboard:
ME10
ME10
S25
UB Bridge resistance
1 2 3

2.5 V RB≥60...4000 Ω OPEN

5V RB≥110...4000 Ω
CLOSED
10 V RB≥220...4000 Ω

S25

MGA II
Balancing/Range Ý Zero balancing D-3

ME30
ME30
UB Bridge resistance Switch S25
2.5 V RB ≥60...4000 Ω
5V RB ≥110...4000 Ω

ME50
UB Bridge resistance Switch S25 Switch S29
1 V1) RB ≥2.5...20 mH
S25
2.5 V RB ≥6...19 mH

ME50

NOTE
If the ME50 is used with SI01 safety barriers, ensure that the
bridge supply voltage is 1 V and that switch S29 is in the ‘”Full
bridge” position.

S25

S29

MGA II
D-4 Balancing/Range Ý Zero balancing

1.2 Zero balancing

Perform zero balancing before the first measurement and after each
alteration to the measurement set-up
ME10

1. Leave sliding switches in the MEAS. position during

balancing.

2. Set the polarity with switch S23. Set to minus for positive and
plus for negative indication.

3. Coarse balancing
With switch S22 set the smallest possible display value.

The balance range for ME10 and ME30 is approx. 2 mV/V,

for ME50 80 mV/V.

4. Fine balancing
P23 With P23 set the display precisely to zero.
S22
Example:
S23
Display on DA12: -1.437

S23 to +
S22 as close as possible to zero, e.g.: 0.123

With P23 set to 0.000.

MGA II
Balancing/Range Ý Setting a range D-5

2 Setting a range

Using the adjustment controls on the operating panel RANGE (P21,

P22), match the sensitivity of the amplifier to the transducer signal.
ME10 Try to set the measuring range so as to utilise the amplifier’s dynamic
range (10 V) as fully as possible.

Range coarse
Using internal DIP switches the two ranges can be set independently to
the transducer’s nominal sensitivity.

Factory settings:

ME10 and ME30: MB1!2 mV/V

P21 MB2!0.2 mV/V
P22

Range Switch S24/4 External

MB1 = 2 mV/V OPEN -

Connect contacts 4
MB2 = 0.2 mV/V CLOSED and 22 from Bu2
(see page B-10)

ME50: MB1!80 mV/V

MB2!8 mV/V
Range Switch S24/4 External
ME30, ME50
MB1 = 80 mV/V OPEN -
Connect contacts 4
MB2 = 8 mV/V CLOSED and 22 from Bu2
(see page B-10)

S24/4
MGA II
D-6 Balancing/Range Ý Setting a range

ME10, ME30 Pre-setting of the ranges in the range 0.2 mV/V ...4 mV/V for UB=5 V
(ME10, ME30) / 0.4 mV/V...8 mV/V for UB= 2.5 V (ME50) is possible
S26 S27 with switches S26 and S27 as shown in the following tables:

UB = 2,5 V UB = 5 V UB = 10 V MB1: S26/ MB2: S27

mV/V mV/V mV/V 1 2 3 4 5 6 7 8
0.34-0.48 0.17-0.24 0.09-0.12
0.44-0.64 0.22-0.32 0.11-0.16
0.60-0.84 0.30-0.42 0.15-0.21
0.78-1.1 0.39-0.55 0.20-0.28
1.04-1.46 0.52-0.73 0.26-0.37
1.36-1.94 0.68-0.97 0.34-0.49
1.80-2.56 0.90-1.28 0.45-0.64
2.36-3.38 1.18-1.69 0.59-0.85
3.12-4.46 1.56-2.23 0.78-1.12
OPEN 4.14-5.88 2.07-2.94 1.04-1.47
5.46-7.76 2.73-3.88 1.37-1.94
CLOSED
7.22-10.26 3.61-5.13 1.81-2.57

The range should be set so that the nominal value of the transducer
(see identification plate) is within one range, in order thereby to obtain
the greatest possible output signal.

Example: Force transducer 100 N at 2 mV/V

Range setting: 1.56...2.23 mV/V

MGA II
Balancing/Range Ý Setting a range D-7

UB = 1 V UB = 2,5 V MB1: S26/ MB2: S27

ME50
mV/V mV/V 1 2 3 4 5 6 7 8
S26 S27 17.0-24.0 6.8-9.6
22.0-32.0 8.8-12.8

30.0-42.0 12.0-16.8
39.0-55.0 15.6-22.0
52.0-73.0 20.8-29.2
68.0-97.0 27.2-38.8
90.0-128.0 36.0-51.2
118.0-169.0 47.2-67.6
156.0-223.0 62.4-89.2
207.0-292.5 82.8-117.0
OPEN
272.0-387.5 109.0-155.0
CLOSED 360.0-512.5 144.0-205.0

MGA II
D-8 Balancing/Range Ý Setting a range

Range fine
ME10 Both ranges can be separately fine-tuned with P21 (MB1) or P22
(MB2). In this case corrections up to 35 % relative to the set range are
possible.

NOTE
If the factory calibration of MB2 (+0.2 mV/V or +8 mV/V) is to be
retained, P22 must not be altered.
P21
P22 For MB1 it is also possible to perform fine-setting by means of an
external potentiometer (approx. 35 % of the set range).
To do this, reset switches S24 / 1 + 2 as per the following table and
1 connect the potentiometer to contacts 17-19 of jack Bu2 (rear of
2 housing) (see also page B-10).
21
5
17 Range 1 fine Switches S24/ 1+2 External
5kΩ
18
MB1 internal CLOSED OPEN
19 -
(factory setting) 1 2

OPEN Potentiometer to
Bu2
MB1 external CLOSED contacts 17-19
1 2

ME30, ME50

MGA II S24/1+2
Balancing/Range Ý Calibrating the measuring chain D-9

3 Calibrating the measuring chain

Calibrating a measuring chain serves to maintain a clear-cut

relationship between measured and displayed value. Here we explain
ME10 two standard calibration procedures suitable for the MGA II System.

Method A: Internal calibration signal

The amplifier has an internal calibration signal of +1 mV/V 0.1 %

(+8 mV/V 1 % for ME50) with which for the measuring range
1 mV/V (ME50: 8 mV/V) the amplifier’s sensitivity can be adjusted.

1. Set sliding switch to position CAL during the calibration task.

2. Using potentiometer P21 for MB1, set the range so that the
desired output signal appears.
P21 Example:
2 mV/V = 10000
P22
Internal calibration signal 1 mV/V = 5000
Set output signal to 5000

MB2 has been calibrated at the factory to 0.2 mV/V (ME50:

8 mV/V).

NOTE
If the setting of MB2 is altered, this value can no longer be set
later using the internal calibration signal by balancing
potentiometer P22.

On calling the calibration signal you always receive a fixed value for
checking, irrespective of the transducer load.

MGA II
D-10 Balancing/Range Ý Calibrating the measuring chain

Method B: Direct loading of the transducer

ME10 A defined load is applied to the attached transducer. The accuracy of

this calibration depends on the calibration weighting (end measure in
the case of displacement transducers).

1. Set sliding switch to position MEAS during the calibration

task.

2. Select a range such that the amplifier is driven to the

maximum possible extent by the calibration load.

3. Apply a defined load to the transducer.

P21 4. With potentiometer P21, set the display so as to bring about a

P22 reference to the load-quantity. You can display a mechanical
load at the correct digital and numerical value. The same
procedure can be followed with P22 (MB2); the factory
calibration 0.2 mV/V (ME50: 8 mV/V) will be lost.

Mechanical calibration can be simulated electrically using a

calibrator.

Example:

Transducer: Load-cell with nominal load 10kg

Nominal characteristic: 2 mV/V
Calibration load: 5 kg

For Range 1: With P21 set display to 5000 d; 1 d = 1 g

For Range 2 proceed similarly using P22.

MGA II
Balancing/Range Ý Zero operating mode D-11

4 Zero operating mode

The amplifiers in the MGA II System are easily replaced.

ME10 1. When internal calibration is finished, move sliding switch to position

ZERO (check amplifier zero-point).
2. The zero value set is displayed and corresponds to the suppressed
previous load (tare value).
Example:
Tare value: 0.1 mV/V
2 mV/V = 2000 kg
0.1 mV/V = 100 kg

Zero: -100 kg is displayed (negative tare load)

3. Note this value.

P21
4. Switch amplifiers.
P22 5. Move sliding switch to position ZERO.
6. Set polarity with switch S23. For positive indication to minus, for
P23 negative indication to plus.
7. With switch S22 set the value noted previously as precisely as
S22 possible.
8. With P23 set the display precisely to the noted value (-100).
S23 9. The amplifier has now been matched to the transducer’s zero point.

The amplifier can now be calibrated with the internal calibration signal
(see page D-9).

MGA II
D-12 Balancing/Range Ý Measuring-frequency range

5 Measurement frequency range /Cut-off frequency

ME30, ME50 The amplifier’s Butterworth low-pass is factory-set:

ME10 ME30 ME50 ME50S6
0...500 Hz 0...60 Hz 0...500 Hz 0...250 Hz

You can change the measuring-frequency range by repositioning

DIP-switches S24/3 and S24/6:

ME10

S24/3+6 Measurement S24/3 S24/6

frequency range
0...2 Hz (-1 dB)
OPEN OPEN
fg = 2.5 Hz (-3 dB)
0...500 Hz (-1 dB)
CLOSED OPEN
fg = 675 Hz (-3 dB)
0...10 kHz (-1 dB)
without effect CLOSED
fg = 20 kHz (-3 dB)

ME30
Measurement S24/3
frequency range
0...60 Hz (-1 dB)
CLOSED
fg = 80 Hz (-3 dB)
0...2 Hz (-1 dB)
OPEN
fg = 2.5 Hz (-3 dB)

MGA II
Balancing/Range Ý Measuring-frequency range D-13

ME50
Measurement S24/3
frequency range
0...500 Hz (-1 dB)
CLOSED
fg = 675 Hz (-3 dB)
0...2 Hz (-1 dB)
OPEN
fg = 2.5 Hz (-3 dB)

MGA II
D-14 Balancing/Range Ý Measuring-frequency range

MGA II
Technical Data Ý MGA II System E-1

E Technical Data

MGA II
E-2 Technical Data Ý MGA II System

1 MGA II System

1.1 System device

Mains power supply
Nominal input voltage V AC 115 V/230 V -25+15 %
Max. nominal input current A 2.2/1.3
Starting current A < 20
Max. power consumption W 83
Nominal temperature range oC -10...+60
Service temperature range oC -20...+60
Storage temperature range oC -25...+70
Protection system Desktop housing 19” module frame
IP20 IP20

Dimensions of desktop housing (in mm)

Desktop housing TG 005 Desktop housing TG 007 (255x171x367)
(173x171x367)

Desktop housing TG009 (173x171x367)

19” module frame ER 007 (483x132.5x367)

Desktop housing Module frame Maximum number of channels Supply voltage

TG005 - 6 230 V (115 V)
TG007 - 12 230 V (115 V)
TG011 - 2 230 V (115 V)
- ER007 12 230 V (115 V)

MGA II
Technical Data Ý MGA II System E-3

1.2 DA12 Digital indicator

Class of accuracy 0.05

Digital display range
Nominal value d  10,000
Maximum value d  19,999
Input
Measurement channels 12
Differential input voltage for nominal display value V  10.000
Differential input voltage, maximum value V  19.999

Input resistance kΩ > 100

Permissible common-mode rejection against V 1
operating-voltage zero
Common-mode rejection dB > 50
Measured-value display mm 14
Seven-segment display
Polarity indication automatic
Decimal-point indication 10,000; fixed
(can be switched on/off with St21)
Overload indication V >  10
Measurement (conversion) time s 0.4
Integration time s 0.1
Linearity variance in nominal range 10000 d d 1
Error of symmetry in nominal range 10000 d d 1
Effect of 10 K change in ambient temperature

on zero point % 0.005 of scale value

on sensitivity % 0.03

MGA II
E-4 Technical Data Ý MGA II System

1.3 EM001 End-phase module

Input
Input voltage V -10 ... +10
Input resistance kOhm 12.5
Output
Impressed voltage V -10 ... +10
Impressed current mA  20 / 4 ... 20
Load resistance Ohm maximum 500, minimum 500
Measurement frequency range kHz 0...10
Operating voltage V +16; -16
Current consumption mA 35

MGA II
Technical data Ý Amplifier plug-in units E-5

2 Amplifier plug-in unit ME10

Type ME10
Class of accuracy 0.1
Excitation voltage V 2.5 2 % 5 2 % 10 2 %
Attachable transducers
Strain-gauge transducer (full bridge) Ω 60...4000 110...4000 220...4000
Maximum cable length m 500
Number of ranges 2
Ranges, adjustable in 12 steps mV/V 0.4...8 0.2...4 0.1...2
Continuous fine adjustment % 35
Factory setting: Range 1 mV/V 2
Range 2 mV/V  0.2
Calibration signal mV/V + 1  0.1 %
Bridge balancing range
Coarse balance, adjustable in 16 steps (polarity adjustable) mV/V 2
Fine balance, using screwdriver potentiometer mV/V  0.08
Measurement frequency range Butterworth low-pass, 3rd order Without
low-pass
at -1 dB Hz 0...2 0...500 0...10,000
at -3 dB Hz 2.5 675 20,000
Phase delay time ms 135 0.55 0.01
Rise time ms 170 0.5 0.015
Overshoot on sudden change in signal % <10 <10 <0.1
Input (symmetrical)
Input impedance MΩ >20
par. pF 200
Permissible common-mode voltage V 6 V
DC 0...500 Hz
Common-mode rejection dB >130 100
Output (asymmetrical)
Nominal voltage V  10
Permissible load resistance kΩ >5
Internal resistance Ω <5

MGA II
E-6 Technical data Ý Amplifier plug-in units

Noise, at UB=5V projected backwards to the input (peak-to-peak value) µV/V <0.1 <0.5 <2
Linearity variance
relative to nominal voltage % <0.01

Effect of 10 K change in temperature in the nominal temperature range

relative
to sensitivity % <0.1; typically 0.05
to the zero point at the amplifier output
in the range 2 mV/V at UB=5 V (4x350Ω) mV <10, or
in the range 0.2 mV/V at UB=5 V mV <100; additionally
<0.05 % of the bridge balance value
Long-term drift over 48 h (after 1 h warm-up time) µV/V <0.1

MGA II
Technical data Ý Amplifier plug-in units E-7

3 Amplifier plug-in unit ME10S6

Type ME10S6
Class of accuracy 0.1
Excitation voltage V 5 2 %
Attachable transducers
Strain-gauge transducer (full bridge) Ω 110...4000
Maximum cable length m 500
Measurement frequency range Measurement frequency is set using low-pass to
0...250 Hz (-1 dB)
Range mV/V 1
Fine balance, using screwdriver potentiometer mV/V 0.9...1.28
Bridge balance range, approx. mV/V 0.08
Input (symmetrical)
Input impedance MΩ > 20
par. pF 200
Permissible common-mode voltage V 6 V
Common-mode rejection dB DC: >130
Output (asymmetrical)
Nominal voltage V  10
Permissible load resistance kΩ >5
Internal resistance Ω <5
Noise, at UB=5 V projected backwards to the input (peak-to-peak value) µV/V <0.5
Linearity variance relative to nominal voltage % <0.01
Effect of 10 K change in temperature in the nominal temperature range
relative
to sensitivity % <0.1; typically 0.05
to the zero point at the amplifier output
in the range 1 mV/V at UB=5 V mV <20
Long-term drift over 48 hours (after 1 h warm-up time) µV/V <0.1

MGA II
E-8 Technical data Ý Amplifier plug-in units

4 Amplifier plug-in unit ME30

Type ME30
Class of accuracy 0.1
Carrier frequency Hz 600 0.5 %
Excitation voltage V 2.5 2 % 5 2 %
Attachable transducers
Strain-gauge transducer (full bridge) Ω 60...4000 110...4000
Maximum cable length m 500
Number of ranges 2
Ranges, adjustable in 12 steps mV/V 0.4...8 0.2...4
Continuous fine adjustment % 35
Factory setting: Range 1 mV/V 2
Range 2 mV/V  0.2
Calibration signal mV/V +1 0.1 %
Bridge balancing range
Coarse balance, adjustable in 16 steps (polarity adjustable) mV/V 2
Fine balance, using screwdriver potentiometer mV/V  0.08
Measurement frequency range Butterworth low-pass, 3rd order, switchable
at -1 dB Hz 0...2 0...60
at -3 dB Hz 2.5 80
Phase delay time ms 135 4.8
Rise time ms 170 7
Overshoot on sudden change in signal % <10 <10
Residual carrier voltage % <0.1 <0.2; typically 0.1
Input (symmetrical)
Input impedance MΩ >10
par. pF 470
Permissible common-mode voltage V 6 V
Common-mode rejection dB 0...600 Hz: >50
Output (asymmetrical)
Nominal voltage V  10
Permissible load resistance kΩ >5
Internal resistance W <5
Noise, projected backwards to the input µV/V <0.2 (peak-to-peak); typically 0.1
Linearity variance
relative to nominal voltage % <0.02; typically 0.01

MGA II
Technical data Ý Amplifier plug-in units E-9

Effect of 10K change in temperature in the nominal temperature range

relative
to sensitivity % <0.1; typically 0.05
to the zero point at the amplifier output
in the range 2 mV/V at UB=5 V (4x350 Ω) mV <4, or
in the range 0.2 mV/V at UB=5 V mV <13; additionally
<0.05 % of the bridge balance value
Long-term drift over 48h (after 1h warm-up time) µV/V <0.05

MGA II
E-10 Technical data Ý Amplifier plug-in units

5 Amplifier plug-in unit ME50

Type ME50
Class of accuracy 0.1
Carrier frequency Hz 4800 0.5 %
Excitation voltage V 1 3 % 2.5 2 %
Attachable transducers
Inductive transducers (half bridge) mH 2.5...20
Maximum cable length m 500
Number of ranges 2
Ranges, adjustable in 12 steps mV/V 20...400 8...160
Continuous fine adjustment % 35
Factory setting: Range 1 mV/V  80
Range 2 mV/V 8
Calibration signal mV/V +8 0.1 %
Bridge balancing range
Coarse balance, adjustable in 16 steps (polarity adjustable) mV/V  80
Fine balance, using screwdriver potentiometer mV/V  3.2
Measurement frequency range Butterworth low-pass, 3rd order, switchable
at -1 dB Hz 0...2 0...500
at -3 dB Hz 2.5 675
Phase delay time ms 135 0.55
Rise time ms 170 0.5
Overshoot on sudden change in signal % <10 <10
Residual carrier voltage % <0.02 <0.2; typically 0.1
Input (symmetrical)
Input impedance MΩ >0.2
par. pF 100
Permissible common-mode voltage V 6 V
Common-mode rejection dB 0...4800 Hz: > 50
Output (asymmetrical)
Nominal voltage V  10
Permissible load resistance kΩ >5
Internal resistance Ω <5

MGA II
Technical data Ý Amplifier plug-in units E-11

Noise, projected backwards to the input µV/V 500 Hz:<8 (peak-to-peak)

2 Hz:<0.08(peak-to-peak)
Linearity variance
relative to nominal voltage % <0.05; typically 0.02

Effect of 10 K change in temperature in the nominal temperature range

relative
to sensitivity % <0.15; typically 0.1
to the zero point at the amplifier output µV/V <8; typically 4
additionally <0.05 % of the bridge balance value

Long-term drift over 48 h (after 1 h warm-up time) µV/V <0.8

MGA II
E-12 Technical data Ý Amplifier plug-in units

6 Amplifier plug-in unit ME50S6

Type ME50S6
Class of accuracy 0.1
Carrier frequency Hz 4800 0.5 %
Excitation voltage V 1 2 % 5 2 %
Attachable transducers
Strain-gauge transducer (full bridge) Ω 60...4000 110...4000
Maximum cable length m 500
Number of ranges 2
Ranges, adjustable in 12 steps mV/V 1...20 0.2...4
Continuous fine adjustment % 35
Factory setting: Range 1 mV/V 1
Range 2 mV/V  0.2
Calibration signal mV/V +1 0.1 %
Bridge balancing range
Coarse balance, adjustable in 16 steps (polarity adjustable) mV/V 2
Fine balance, using screwdriver potentiometer mV/V  0.08
Measurement frequency range Butterworth low-pass, 3rd order, switchable
at -1 dB Hz 0...40 0...250
at -3 dB Hz 50 300
Phase delay time ms 7 1.1
Rise time ms 10 1.6
Overshoot on sudden change in signal % <10 <10
Residual carrier voltage % <0.02 <0.2; typically 0.1
Input (symmetrical)
Input impedance MΩ >10
par. pF 470
Permissible common-mode voltage V 6 V
Common-mode rejection dB 0...600 Hz: >50

MGA II
Technical data Ý Amplifier plug-in units E-13

Output (asymmetrical)
Nominal voltage V  10
Permissible load resistance kΩ >5
Internal resistance Ω <5
Noise, projected backwards to the input µV/V <0.2 (peak-to-peak); typically 0.1
Linearity variance
relative to nominal voltage % <0.02; typically 0.01

Effect of 10 K change in temperature in the nominal temperature

range relative
to sensitivity % <0.1; typically 0.05
to the zero point at the amplifier output
in the range 2 mV/V at UB=5 V (4x350 Ω) mV <4, or
in the range 0.2 mV/V at UB=5 V mV <13; additionally
<0.05 % of the bridge balance value
Long-term drift over 48 h (after 1 h warm-up time) µV/V <0.05

MGA II
E-14 Technical data Ý Connection boards

7 Connection boards

AP01 AP03
AP01 (connection board with D-connector)
Width mm 20.3 (4 divs)
Transducer port 15-pin D-plug, DA-15P 1)
Output-signal connection 25-pin D-plug, DB-25P 2)
Option 2x EM001; 2x RM001 with AP02

AP03 (connection board with MS-plug)

Width mm 40.6 (8 divs)
Transducer port 7-pin MS cable plug, MS3106A 16S-1P 3)
Output-signal connection 25-pin D-plug, DB-25P 2)
Option 2x EM001, 2x RM001 with AP02

AP11 (connection board with LEMO jack)

Width mm 20.3 (4 divs)
AP11
Transducer port 6-pin LEMO FGG . 1B.306 4)
Output-signal connection 25-pin D-plug, DB-25P 2)
Option 2x EM001; 2xRM001 with AP02

1) HBM order number 2-9278.0321

2) HBM order number 2-9278.0293
3) HBM order number 1-MS3106 PEMV
4) HBM order number 3-3312.0126

MGA II
Index F-1

F Index

B I
Bridge supply voltage, D-2 Internal calibration signal, D-9

C M
Calibration, D-9 MASTER, B-12
Coarse balance, D-4 Measuring-frequency range, D-12
Connecting a strain-gage full bridge, B-5
Connection boards, B-4 , B-10 , C-3
R
Cut-off frequency, D-12
Range, D-5
Range fine, D-8
D Remotes, B-10
Decimal point, A-7

S
E Safety barriers, B-7 , D-3
Earthing switch, B-2 Safety instructions, 5
End-phase module EM001, B-11 residual dangers, 5
SLAVE, B-12
Synchronisation, B-12
F
Fine balance, D-4
Z
Four-wire connection, B-4 , B-6
Zero balance, D-4
Zero value, D-11
G
Greenline, B-3
Guidelines, A-2

MGA II
Modifications reserved.
All details describe our products in
Hottinger Baldwin Messtechnik GmbH
general form only. They are not to be understood as
express warranty and do not constitute any liability
whatsoever.
Im Tiefen See 45, D-64293 Darmstadt, Germany
Tel.: +49 6151 8030; Fax: +49 6151 803 9100
B0599-3.4 en E-mail: support@hbm.com www.hbm.com