Compliance West GFM-40ac, Instruction Manual

Page: 17 / 19

13
Before starting the Calibration procedure,
perform the Calibration access procedure given
earlier in this Section.
NOTE
Allow the instrument to stabilize for
approximately five minutes. Perform
all calibration adjustments at an
ambient temperature of 23
°
C
±
5
°
C (73
°
F
±
9
°
F).
WARNING
CALIBRATION ADJUSTMENTS ARE
PERFORMED ON ENERGIZED
CIRCUITS. EXERCISE CAUTION AT ALL
TIMES, AND USE A NON-CONDUCTIVE
TOOL FOR ALL ADJUSTMENTS.
Voltage Calibration Adjustment
Use the following procedure to calibrate the
Output Voltage Range.
1.
Using supplied Test Lead and 10 AWG
Test Power Cord, perform the Voltage
Zero Calibration. See Page 5, "Setting
Voltage Zero using the supplied IEC Test
Cordset" for details.
2.
Connect the Test Lead and the ground of
the IEC Test Cordset to the back panel (or
other) 0.1 ohm resistor using the alligator
clip/wire assembly.
3. Connect the DMM across the 0.1 ohm
resistor.
4.
Switch the Volts/Amps switch on the front
panel of the GFM-40ac to Volts.
5.
Adjust the "CAL" knob on the front panel
of the GFM-40ac until the DMM reads
2.5Vdc.
6.
Push the Test Button on the front panel
and adjust the resistor marked R26 until
the front panel meter of the GFM-40ac
reads 2.5 volts.
Current Calibration Adjustment
Use the following procedure to calibrate the
Current Output.
1.
Perform the voltage calibration adjustment
procedure above.
2.
With the DMM and test leads connected
per the voltage calibration adjustment
procedure, switch the Volts/Amps switch
of the GFM-40ac to Amps.
3.
Push and hold the Test Button on the front
panel of the GFM-40ac. Adjust the
"CAL" knob on the front panel of the
GFM-40ac until the DMM reads 2.5 volts.
4.
Adjust the resistor marked R25 until the
front panel meter of the GFM-40ac reads
2.5 volts. .