Periodic Safety Check
6-20
Force EZ-C Series Service Manual
Checking Low Frequency Leakage Current and Ground
Resistance
Check the leakage current and ground resistance before returning the Force EZ-C
Series Electrosurgical Generator to clinical use.
Equipment
•
DVM
•
Leakage current test load per IEC 60601-1 1988, Figure 15
Figure 6-7.
The leakage current test circuit
Output Receptacles and REM Source Current
1.
Set the DVM to AC volts (200 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 per 1
millivolt.
5.
Verify under normal conditions (ground closed, normal polarity) the leakage
current is less than 10 microamps. If the leakage current is greater than 10
microamps, call the Valleylab Service Center.
6.
Verify under single fault conditions (ground open) the leakage current is less
than or equal to 50 microamps. If the leakage current is greater than
50 microamps, call the Valleylab Service Center.
Chassis or Earth Leakage
1.
Set the DVM to AC volts (200 mV) and connect the leakage current test
circuit.
2.
Turn on the generator.
3.
Measure between the chassis and earth ground.
4.
Determine the leakage current using the conventional 1 microamp per 1
millivolt.
10k ohms
1k ohms
Z
.015
μ
f
V
