GE Giraffe Blue Spot PT Lite - 8.4.4 Electrical Safety Tests; 8.4.4.1 Ground Resistance Check; 8.4.4.2 Leakage Current Checks

4. Divide the lowest reading by the highest reading. If the LED light is functioning properly, the result
should be greater than 0.4. Refer to symptom S12 in Chapter 10 for troubleshooting.
8.4.4 Electrical Safety Tests
It is recommended that the electrical safety tests be performed as follows:
• Before the rst use of Girae Blue Spot PT Lite
• Each time the system is serviced
• Every twelve months thereafter
Use an approved electrical safety analyzer. Follow the operating instructions supplied by the vendor of the
electrical safety analyzer. For reliable leakage current checks, perform the ground resistance check rst.
8.4.4.1 Ground Resistance Check
The ground resistance check varies depending on the power source:
• For a system plugged into a wall outlet, measure the resistance between power cord ground terminal
and the potential equalization stud on the system. The ground resistance must be less than 0.1 ohms.
• For a system plugged into an accessory outlet on a microenvironment, measure the resistance
between the power cord ground terminal of the microenvironment and the potential equalization stud
on the Girae Blue Spot PT Lite. The ground resistance must be less than 0.2 ohms.
8.4.4.2 Leakage Current Checks
In normal conditions and in all possible operating modes:
• For a system plugged into a wall outlet, measure the leakage current and conrm that it is less than
130 microamperes.
• For a system plugged into an accessory outlet on a microenvironment, measure the leakage current
and conrm that it does not increase leakage current of the microenvironment by more than 130
microamperes.
If required by local ordinances, in single fault condition and in all possible operating modes:
- For a system plugged into a wall outlet, measure the leakage current and conrm that it is less than 500
microamperes.
- For a system plugged into an accessory outlet on a microenvironment, measure the leakage current
and conrm that it does not increase leakage current of the microenvironment by more than 500
microamperes.
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Chapter 8: Service Maintenance and Checkout