Compliance West GFM-40ac, Instruction Manual

Page: 12 / 19

8
Volts/Amps switch is set to Volts, the meter
will swing.
2. Set the "CAL" knob on the front panel to its
minimum (furthest counter-clockwise)
position.
3. Set the front panel switch to Amps.
4. Plug the split end plug of the 10 AWG Test
Lead into the "Chassis" Receptacle of the
Tester.
5. Plug the supplied 10 AWG Test Power Cord
or non-detachable EUT power cord into the
"Device" Receptacle of the Tester, and then
into the power inlet of the equipment to be
tested.
6. Connect the alligator clip end of the Test
Lead to the chassis of the equipment to be
tested.
7. Push the test button. While the Test Button
is pressed, set the current to the desired level
with the current knob. The test will
continue only as long as the test button is
pressed.
8. The results of the test will be shown on the
front panel meter. Voltage and current can
be read by cycling the volts/amps switch on
the front panel.
Test results (Laboratory Use)
By noting current and voltage readings, the
resistance of the grounding path of the EUT can
be easily determined. Check the appropriate
Safety Standard for the product category and
safety agency to determine acceptable grounding
circuit resistance.
For new designs, start at a low current and
gradually increase to the full 25 amps so the
EUT is not damaged. Following this strategy,
you will be able to locate weak links in the
grounding chain and redesign them before
production.
Using the GFM-40ac for
Production Line Testing
The GFM-40ac can be used effectively in low-
volume production line testing. Set the voltage
zero point and the current level each time a
different length or gauge test lead or Cord is
used, and every time the instrument is returned
to production line use following an annual
calibration or laboratory testing. In the
following section, EUT means equipment under
test.
CAUTION
High current. Risk of burns.
Remove any conductive
jewelry before using the
Tester.
NOTE
If the EUT uses a detachable
power cord, use the supplied 10
AWG Test Power Cord, not the
EUT power cord. The accuracy
of the calibration procedure
depends on use of the same
power cord type for all testing.
Setting the Current Level
1. Set the voltage zero point as shown on
page 5. This adjustment allows the GFM-
40ac to compensate for the resistance of
the cordset and the return lead.
2. Connect your Tester to a correctly rated
source of supply and turn the power
switch to the I or ON position. The tester
will perform a self-diagnostic test.
3. Set the current adjustment knob on the
front panel to its minimum (furthest
counter-clockwise) position.
4. Set the volts/amps switch on the front
panel to Amps.
5. Plug the split end plug of the 10 AWG
Test return lead into the "Chassis"
Receptacle of the Tester.
6. Plug the supplied 10 AWG Test Power
Cord or non-detachable EUT power cord
into the "Device" Receptacle of the Tester.
7. Using the alligator clip/wire assembly,
short the Test Cordset (or non-detachable
EUT power cord used in the voltage zero
procedure) together.
8. Push and hold the test button and adjust
the current to the desired level.
9. Set the volts/amps switch on the front
panel to Volts.
Production Line Testing
During the Production Line Testing procedure, it
is important that the current adjustment knob on
the front panel is not moved to ensure the
desired amount of current is flowing.
1.
Connect your Tester to a correctly rated
source of supply and turn the power switch