CHAPTER 2
Core Configuration
Checking Ground Resistance at the Optical/Tributary Shelf Power Input
FNC-7500-0061-200
Issue 1, May 2009
FLASHWAVE 7500 Release 6.1
Equipment Installation
2-58
Fujitsu and Fujitsu Customer Use Only
2.12 Checking Ground Resistance at the Optical/Tributary
Shelf Power Input
Ideally, frame ground and battery return at the shelf power input connectors are common to
each other. Essentially a resistance of 0 ohms should be present between them and little or no
voltage potential across frame ground and battery return.
The test equipment required is a DMM or a voltmeter and ohmmeter that can accurately
detect low resistance levels. See Figure 2-32 [p. 2-58].
1 Use the DMM set to the voltmeter function or a voltmeter to measure the voltage between
frame ground and each of the battery return points. The reading should be very close to 0 V
DC.
2 Does the voltage exceed 1 V DC?
If YES:
Do not continue with Step 3 [p. 2-59] until the voltage source has been eliminated. For
technical assistance, call 1-800-USE-FTAC (800-873-3822).
If NO:
Continue with Step 3 [p. 2-59].
Figure 2-32: Ground Voltage Check Example
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