of high temperature,humidity,explosive,inflammable No.

Symbol Description The AC Current ranges are: 2mA, 200mA and 20A
and strong magnetic field. The performance of To measure current, do the following:
1 The unit of transistor test
the Meter may deteriorate after dampened.
The battery is low. 1.Turn off power to the circuit. Discharge all high-
z When using the test leads, keep your fingers 2
Warning: To avoid false voltage capacitors.
behind the finger guards.
readings, replace the battery as 2. Insert the red test lead into the A or μAmA (UT58A)
z Disconnect circuit power and discharge all high
-voltage capacitors before testing resistance, soon as the battery indicator or mA (UT58B/UT58C) terminal and the black test
continuity, diodes, capacitance or current. appears. lead into the COM terminal.
z Before measuring current, check the Meter’s Indicator for AC voltage or current. 3.Set the rotary switch to an appropriate measurement
fuses and turn off power to the circuit before 3 AC The displayed value is the mean position in A or A range.
connecting the Meter to the circuit. value. 4. Break the current path to be tested. Connect the red
z Replace the battery as soon as the battery indicator 4 Indicates negative reading. test lead to the more positive side of the break and
appears. With a low battery, the Meter might 5 Test of diode. the black test lead to the more negative side of the
produce false readings that can lead to electric 6 The continuity buzzer is on. break.
shock and personal injury. 7 Date hold is active. 5. Turn on power to the circuit.
z Remove test leads, test clips and temperature
8 Indicator of connecting test leads The measured value shows on the display.
probe from the Meter and turn the Meter power Connect
Terminal into different input terminals.
off before opening the Meter case.
z When servicing the Meter, use the replacement
parts with the same model or identical electrical Ω,kΩ,MΩ
specifications.
z To avoid any damage to the meter or any accident,
do not alter the internal circuit of the Meter randomly. mV, V
z Soft cloth and mild detergent should be used to
clean the surface of the Meter when servicing.
No abrasive and solvent should be used to prevent
the surface of the Meter from corrosion, damage μF nF
and accident. 9
z The Meter is suitable for indoor use.
z Turn the Meter power off when it is not in use (See Figure 5)
and take out the battery when not using for a long
Overview time. μA, mA, A
z Constantly check the battery as it may leak when
Warning it has been using for some time, replace the battery
To avoid electric shock or personal injury, read the as soon as leaking appears. A leaking battery will o
“Safety Information”, carefully before using the Meter. damage the Meter. C
Digital Multimeters Model UT58A, UT58B and UT58C black red
are 2000-count hand-held instruments with remarkable
International Electrical Symbols
features: ex-large LCD, steady operations, overload AC (Alternating Current).
(Figure 5)
protection for all ranges and unique structure. The
Meter can measure AC/DC voltage, AC/DC current, DC (Direct Current). Measurement Operation Warning
resistance, capacitance, temperature, frequency, Grounding. A. Measuring DC and AC Voltage (See Figure 3) To avoid damages to the Meter or to the devices
transistor, diode and continuity, and is equipped with under test, disconnect circuit power and discharge
data hold, full icon display and sleep mode functions. Double Insulated. all the high-voltage capacitors before measuring
Low Battery Indication. resistance.
Unpacking Inspection The resistance ranges are:
Warning. Refer to the Operating Manual. Model UT 58A/UT58B:200Ω,2kΩ ,20kΩ,2M Ω,20MΩ and
for 200MΩ.
Conforms to Standards of European Union.
Model UT 58C:200Ω, 2kΩ, 20kΩ, 2MΩ and 20MΩ.
black red
Item Description Qty The Meter Structure (See Figure 1) 1. Insert the red test lead into the Hz VΩ (UT58C) or
1 English Operating Manual 1 pc VΩ (UT58A/UT58B) terminal and the black test
2 Test Lead 1 pair (Figure 3) lead into the COM terminal.
3 Multi-Purpose Socket 1 pc 1. LCD Display. 2. Set the rotary switch to an appropriate measurement
4 Point Contact Temperature Probe 1 pc 2. HOLD Button. Warning position in Ω range.
(UT58B/UT58C only) 3. Rotary Switch. To avoid harms to you or damages to the Meter from 3. Connect the test leads across with the object being
5 9V Battery (NEDA 1604, 6F22 or 009P) 1 pc 4. Input Terminals. electric shock, please do not attempt to measure measured.
5. POWER voltages higher than 1000V although readings may The measured value shows on the display.
In the event you find any missing or damaged part, be obtained.
please contact your dealer immediately. Note
(Figure 1) The DC Voltage ranges are: 200mV, 2V, 20V, 200V and
Safety Information 1000V. z The test leads can add 0.1to 0.2Ω of error to the slow-
This Meter complies with the standards IEC61010: The AC Voltage ranges are: 2V, 20V, 200V and 750V resistance measurement. To obtain accurate readings
Pollution Degree2, Overvoltage Category (CAT. II 1000V, To measure DC or AC Voltage, connect the Meter as follows: in low-resistance, short-circuit the input terminals
CAT. III 600V) and Double Insulation. 1. Insert the red test lead into the HzVΩ (UT58C) or beforehand and record the reading obtained (called
CAT. II: Local level, appliance, PORTABLE EQUIPMENT VΩ (UT58A/UT58B) terminal and the black test this reading as X). (X) is the additional resistance from
etc., with smaller transient voltage overvoltages than lead into the COM input terminal. the test lead. Then use the equation:
CAT. III 2. Set the rotary switch to an appropriate measurement measured resistance value (Y) – (X)=accurate readings
CAT. III: Distribution level, fixed installation, with smaller position in V or V range. of resistance.
3. Connect the test leads across with the object to be z If the input terminal short-circuit reading 0.5,check
transient overvoltages than CAT. IV
measured. the test leads for any looseness or other cause.
Use the Meter only as specified in this operating manual,
The measured value shows on the display. z For high resistance (>1MΩ), it is normal taking several
otherwise the protection provided by the Meter may be
seconds to obtain a stable reading; select short test
impaired.
leads for stable and precise readings.
In this manual, a Warning identifies conditions and
z When the resistance is higher than the maximum range
actions that pose hazards to the user, or may damage
or in open circuit condition, the Meter displays “1”.
the Meter or the equipment under test.
z When resistance measurement has been completed,
A Note identifies the information that user should pay
disconnect the connection between the testing leads
attention to. and the circuit under test.
Warning (See Figure 6)
To avoid possible electric shock or personal injury, Transistor Test
and to avoid possible damage to the Meter or to the
equipment under test, adhere to the following rules:
Functional Buttons
z Before using the Meter inspect the case. Do not
use the Meter if it is damaged or the case (or part Below table indicated for information about the functional
of the case) is removed. Look for cracks or missing button operations.
plastic. Pay attention to the insulation around the Button Description
black red
connectors. B. Measuring DC and AC Current (See Figure 4)
POWER Turn the Meter on and off.
z Inspect the test leads for damaged insulation or (Yellow z Press down the POWER to turn on
exposed metal. Check the test leads for continuity. Button) the Meter. (Figure 6)
Replace damaged test leads with identical model z Press up the POWER to turn off the
number or electrical specifications before using Meter. Warning
the Meter. z Press HOLD once to enter hold mode. To avoid damage to the Meter or to the equipment
HOLD
z Do not apply more than the rated voltage, as z Press HOLD again to exit hold mode. under test, disconnect circuit power and discharge
(Blue black red
marked on the Meter, between the terminals or all high-voltage capacitors before measuring diodes.
Button) z In Hold mode, is displayed and the
between any terminal and grounding. present value is shown. To avoid harms to you, please do not attempt to input
z The rotary switch should be placed in the right
(figure 4) voltages higher than 60V DC or 30V rms AC.
position and no any changeover of range shall (See Figure 2) Warning Use the diode test to check diodes, transistors, and other
be made during measurement to prevent damage Never attempt an in-circuit current measurement semiconductor devices. The diode test sends a current
of the Meter. where the open circuit voltage between terminals through the semiconductor junction, and then measures
z When the Meter working at an effective voltage CmVVΩkΩMΩ and ground is greater than 250V . the voltage drop across the junction. A good silicon junction
over 60V in DC or 30V rms in AC, special care If the fuse burns out during measurement, the Meter drops between 0.5V and 0.8V
should be taken for there is danger of electric may be damaged or the operator himself may be hurt.
shock. To test out a diode out of a circuit, connect the Meter as
z Use the proper terminals, function, and range Use proper terminals, function, and range for the follows:
for your measurements. nFμFkHzμAmAA measurement. When the testing leads are connected
1. Insert the red test lead into the Hz VΩ (UT58C) or
z If the value to be measured is unknown, use the
Connect Test Leads to the current terminals, do not parallel them across
VΩ (UT58A/UT58B) terminal and the black test
maximum measurement position and reduce the A μ AmA VΩ COM any circuit.
lead into the COM terminal
range step by step until a satisfactory reading is The DC Current ranges are: 2. Set the rotary switch to .
(Figure 2)
obtained. Model UT58A/ UT58B: 20μA,2mA,20mA,200mA and 20A. 3. For forward voltage drop readings on any semiconductor
z Do not use or store the Meter in an environment Model UT58C: 2mA, 200mA, 20A component, place the red test lead on the component’s

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anode and place the black test lead on the component’s Accuracy Specifications
cathode. Accuracy: (a% reading + b digits),guarantee for 1 year. the
o o
The measured value shows on the display. Operating temperature:18 C~28 C.
for Relative humidity: 75%RH.
A. DC Voltage
Overload J. Transistor
Range Resolution Accuracy
Protection
Range Resolution Accuracy±(a% reading + b digits)
200mV 0.1mV 250VAC
2V 1mV (0.5%+1)
20V 10mV hFE 1β Vce 3V Ibo 10μA 1000βMAX
200V 100mV 1000V AC
1000V 1V (0.8%+2)
Remarks:Input Impedance: approx.10MΩ.
B. AC Voltage
z The open-circuit voltage is around 3V.
Range Resolution Accuracy Overload K. Frequency ( UT58C only)
z When diode testing has been completed, disconnect Protection
the connection between the testing leads and the Range Resolution Accuracy Overload
2V 1mV (0.8%+3) Protection
circuit under test.
20V 10mV 1000V AC 2kHz 1Hz
(See Figure 7) 200V 100mV ±(1.5%+5) 250V AC
750V 1V (1.2%+3) 20kHz 10Hz

Remarks:
z Input Impedance: approx.10MΩ.
z Frequency response: Maintenance
(See Figure 8)
40Hz~1kHz< 500V; This section provides basic maintenance information
40Hz~400Hz > 500V including battery and fuse replacement instruction.
black red The 500Hz reading is for reference
z Display sinewave RMS value(AVG response) Warning
Do not attempt to repair or service your Meter unless
(Figure 7) C. DC Current
you are qualified to do so and have the relevant
Model Range Resolution Accuracy Overload calibration, performance test, and service information.
Warning Protection
To avoid harms to you, please do not attempt to input To avoid electrical shock or damage to the Meter, do
voltages higher than 60V DC or 30V rms AC.
UT58A 20μA 0.01μA not get water inside the case.
Fuse 0.5A, 250V,
To avoid damages to the Meter or to the devices under UT58ABC 2mA 1μA (0.8%+1) fast type, A. General Service
test, disconnect circuit power and discharge all the UT58AB 20mA 10μA 5x20mm z Periodically wipe the case with damp cloth and mild
high-voltage capacitors before testing for continuity. UT58ABC 200mA 0.1mA (1.5%+1) detergent. Do not use chemical solvent.
UT58ABC 20A 10mA (2%+5) Un-Fused z To clean the terminals with cotton bar with detergent,
To test for continuity, connect the Meter as below: as dirt or moisture in the terminals can affect readings.
Remarks: z Turn the Meter off when it is not in use and take out
1. Insert the red test lead into Hz VΩ (UT58C) or
z At 20A Range: the battery when not using for a long time.
VΩ (UT58A/UT58B) terminal and the black test
For continuous measurement 10 seconds and z Do not store the Meter in place of humidity, high
lead into the COM terminal. interval time between 2 measurement greater than
I. Measuring Frequency (UT58C Only) temperature, explosive, inflammable and strong
2. Set the rotary switch to . 15 minutes. magnetic field
3. Connect the test leads across with the object being (See Figure 9)
D. AC Current B. Replacing the Fuse (See Figure 10)
measured.
4. The buzzer does not sound if the resistance of a Range Resolution Accuracy Overload
Protection
circuit under test is >70Ω
The buzzer sounds continuously if the circuit is in 2mA 1μA (1.0%+3) Fuse 0.5A, 250V,
good condition with resistance value 10Ω. 200mA 0.1mA (1.8%+3) fast type,
The measured value shows on the display and the 5x20mm
unit is Ω. 20A 10mA (3.0%+5) Un-Fused
Remarks:
z Frequency reaponse: 40Hz~400Hz ( Figure 10)
Warning
z At 20A Range: To avoid electrical shock or arc blast, or personal
For continuous measurement 10 seconds and injury or damage to the Meter, use specified fuses
interval time between 2 measurement greater than ONLY in accordance with the following procedure.
F. Measuring Capacitance (See Figure 8)
15 minutes To replace the Meter’s fuse:
1. Turn the Meter off and remove all connections from
the terminals.
2. Remove the holster from the Meter.
3. Remove the 3 screws from the case bottom, and
UT58ABC separate the case top from the case bottom.
4. Remove the fuse by gently prying one end loose,
UT58ABC
F UT58ABC
then take out the fuse from its bracket.
POWER UT58ABC 5. Install ONLY replacement fuses with the identical type
UT58ABC and specification and make sure the fuse is fixed
UT58AB firmly in the bracket.
Fuse: 0.5A, 250V, fast type,φ5x20mm
capacitance 6. Rejoin the case bottom and case top, and reinstall
the 3 screws and holster.
Replacement of the fuses is seldom required. Burning
of a fuse always results from improper operation.
C.Replacing the Battery (See Figure 10)

Warning
General Specifications To avoid false readings, which could lead to possible
Maximum Voltage or Current between input Terminals electric shock or personal injury, replace the battery
and Grounding: According to different functional input as soon as the battery indicator “ ” appears.
protection value. To replace the Meter’s battery:
1. Turn the Meter power off and remove all connections
z Fused Protection for
uA mA Input Terminals: CE Version: 0.5A, 250V fast from the terminals.
2. Remove the holster from the Meter.
type, 5x20mm.
3. Remove the 3 screws from the case bottom, and
z Maximum Display : 1999,updates 2~3 times/
separate the case top from the case bottom.
second.
4. Remove the battery from the battery connector.
z Range : Manual ranging. H. Capacitance
5. Replace with a new 9V battery (NEDA1604, 6F22
z Polarity display : Automatically
Range Resolution Accuracy or 006P).
z Overloading : Display “1”.
6. Rejoin the case bottom and case top, and reinstall
z Low Battery Indication : Display “ ”.
o o o o 2nF 1pF the 3 screws and the holster.
z Temperature: Operating: 0 C~40 C (32 F~104 F); (4.0%+3)
o o o
Storage : -10 C~50 C(14 F~122 F)
o
200nF 0.1nF
** END **
z Relative Humidity : 75%@00C~300C; ±(5.0%+4)
0 0 100μF 0.1μF When it is 40μF: the obtained
This operating manual is subject to change without notice.
50%@30 C~40 C Copyright 2001 Uni-Trend Group Limited.
z Electromagnetic reading is only for reference All rights reserved.
Compatibility : In a radio field of 1 V/m,
Overall Accuracy = Specified
G. Measuring Temperature
(See Figure 9) Accuracy + 5% of Range;
in a radio field of more than
1 V/m, no assigned accuracy
is specified.
z Battery Type : One piece of 9V (NEDA1604
or 6F22 or 006P). Range Resolution Accuracy
z Dimensions : 179x88x39mm.
z Weight : Approx.380g (including 7
holster and battery)
(Figure 9) z Safety/Compliances : IEC61010 CAT II 1000V,
CATIII 600V overvoltage
and double insulation standard.
z Certificate:

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