Valleylab Force FX-8C, Service Manual

Page: 105 / 218

Periodic Safety Check
Setup, T
ests, and Adjustments
Force FX-8C Service Manual 5-21
Checking Low Frequency Leakage Current and Ground Resistance
Check the low frequency leakage current and ground resistance before
returning the Force FX-8C generator to clinical use.
Equipment required:
• DVM
• Leakage current tester.
Figure 5-9.
Leakage current test circuit per
IEC 60601-1
Output Receptacles and REM Source Current
1.
Set the DVM to AC volts (200 millivolts [mV]) and connect the leakage
current test circuit.
2.
Turn on the generator.
3.
Measure between all the output receptacles (including the Patient
Return Electrode receptacle) and earth ground. Record the largest
reading.
4.
Determine the leakage current using the conventional
1 microamp (µA) per 1 mV.
5.
Verify under normal conditions (ground closed, normal polarity) the
leakage current is less than 10 µA. If the leakage current is greater than
10 µA, call the Valleylab Service Center.
6.
Verify single fault conditions (ground open) the leakage current is less
than or equal to 50 µA. If the leakage current is greater than 50 µA, call
the Valleylab Service Center.