Valleylab Force FX-8C, Service Manual

Page: 102 / 218

Periodic Safety Check
5-18 Force FX-8C Service Manual
Checking the Bipolar Output
1.
Verify that the generator successfully completes the self-test as
described in Testing the Generator in this section.
2.
Connect the test equipment for bipolar output.
a.
Connect the two test cables to the Bipolar Instrument receptacle.
b.
Pass one test cable through the current transformer and connect the
current transformer to the voltmeter.
c.
Connect the 100 ohm power resistor across the output jacks at the
end of the test cables.
d.
Connect the bipolar footswitch to the Bipolar Footswitch receptacle
on the rear panel.
3.
Press the Precise button and set the bipolar power to 10 watts.
4.
Test the output current for the selected Bipolar mode.
a.
Press the footswitch pedal and, while activating the generator, note
the output on the voltmeter.
b.
Release the footswitch pedal.
c.
Based on the voltmeter setting and the current transformer you are
using, calculate and record the output current.
5.
Press the Standard button and repeat step 4.
6.
Press the Macro button and repeat step 4.
7.
Verify that the generator output for each mode is 316 ± 17 mA rms.
If the output is outside the specified range, calibrate the bipolar output
as described in calibration steps 5, 6, 7, and 8. Then repeat this
procedure. If the output for one or more modes remains outside the
specified range, call the Valleylab Service Center.