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MA L OOP CALIBRATOR FLUKE 707 EX
Prepared by : Elkhomainy Hamed
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What is a mA Loop calibrator fluke 707 EX?
The Fluke 707Ex is an intrinsically safe loop calibrator
for use in potential explosive environments.
Function of a mA Loop calibrator fluke 707
EX?
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mA Loop calibrator fluke 707 EX parts
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mA Loop calibrator fluke 707 EX parts
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Using the mA Sourcing (Output) Modes
The Calibrator outputs current for calibrating and
testing 0 to 20 mA and 4 to 20 mA current loops
and instruments.
In SOURCE mode, the Calibrator supplies the
current.
In SIMULATE mode, the Calibrator simulates a
2-wire transmitter in an externally powered current
loop.
Changing the mA Output Span
The Calibrator has two mA output spans:
• 4 mA to 20 mA (0 % to 100 %) [default]
• 0 mA to 20 mA (0 % to 100 %) [optional]
Use SOURCE mode to supply current to a passive circuit.
To change the output span, turn the Calibrator off. Press + simultaneously. The selected setting is saved
until it is changed again.
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Simulating a Transmitter
When simulating the operation of a transmitter, the Calibrator
regulates the loop current to a known value selected by you.
A 12 V to 28 V loop supply must be available. Insert the test leads
as shown in the figure.
Auto Ramping the mA Output
Auto ramping allows you to continuously apply a varying current
from the Calibrator to a passive (sourcing) or active (simulate)
loop. Your hands remain free to test the transmitter’s response.
Press + simultaneously to enter the Auto Ramp mode and
step to a ramp type.
The Calibrator applies or controls a continuously repeating mA
signal over a 0-20 mA or a 4-20 mA span in one of three ramp
types:
Slow ( ) 0 % to 100 % to 0 % smooth ramp over 40 sec.
Fast ( ) 0 % to 100 % to 0 % smooth ramp over 15 sec.
Step ( ) 0 % to 100 % to 0 % stair-step ramp in 25 % steps, pausing 5 sec at each step.
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Using the Span Check Function
When in source mode the Span Check™
function checks the zero and span points of
a transmitter in either SOURCE or
SIMULATE mode.
To select Span Check, press .
To exit, press any pushbutton or turn the
knob.
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Measuring dc mA
To measure dc mA:
1. Press to step to MEASURE mode.
MEASURE mA is displayed.
Touch the test probes to the circuit across
the load or power source as shown below.
Connect the COM probe first.
To prevent damage to the unit under
test, ensure that the Calibrator is in the
correct mode before connecting the test
leads.
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Measuring dc mA with Loop Power
Loop Power provides power to a transmitter (up to 700
Ω load) and simultaneously measures the loop current.
To measure dc mA with Loop Power:
1. Press to step to Loop Power mode.
2. MEASURE mA and Loop Power are displayed.
3. Touch the test probes to the circuit across the load or
power source as shown below. Connect the COM
probe first.
To prevent damage to the unit under test, ensure
that the Calibrator is in the correct mode before
connecting the test leads.
To exit Loop Power, change measurement mode.
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HART Compatibility
When in source mode the Calibrator has > 250 Ohms
of series resistance and is compatible with HART
devices without needing an additional series resistor.
Measuring dc Volts
To measure dc Volts:
1. Press to step to MEASURE mode.
2. MEASURE V is displayed.
3. Touch test lead probes across the load or power
source. Connect the COM probe first.
To prevent damage to the unit under test, ensure
that the Calibrator is in the correct mode before
connecting the test leads.
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