HP Integrity rx8640 Installation Manual page 77

WARNING
Step 1. Measure the voltage between A0 and A1 as follows:
1. Take the AC voltage down to the lowest scale on the volt meter.
2. Insert the probe into the ground pin for A0.
3. Insert the other probe into the ground pin for A1.
4. Verify that the measurement is between 0-5 V AC.
If the measurement is 5 V or greater, escalate the situation. Do not attempt to plug the power cord
into the server cabinet.
Step 2. Measure the voltage between B0 and B1 as follows:
1. Take the AC voltage down to the lowest scale on the volt meter.
2. Insert the probe into the ground pin for B0.
3. Insert the other probe into the ground pin for B1.
4. Verify that the measurement is between 0-5 V AC.
If the measurement is 5 V or greater, escalate the situation. Do not attempt to plug the power cord
into the server cabinet.
Step 3. Measure the voltage between A0 and B0 as follows:
1. Take the AC voltage down to the lowest scale on the volt meter.
2. Insert the probe into the ground pin for A0.
3. Insert the other probe into the ground pin for B0.
4. Verify that the measurement is between 0-5 V AC.
If the measurement is 5 V or greater, escalate the situation. Do not attempt to plug the power cord
into the server cabinet.
Step 4. Measure the voltage between A1 and B1 as follows:
1. Take the AC voltage down to the lowest scale on the volt meter.
2. Insert the probe into the ground pin for A1.
3. Insert the other probe into the ground pin for B1.
4. Verify that the measurement is between 0-5 V AC.
If the measurement is 5 V or greater, escalate the situation. Do not attempt to plug the power cord
into the server cabinet.
Chapter 2
SHOCK HAZARD
Risk of shock hazard while testing primary power.
Use properly insulated probes.
Be sure to replace access cover when finished testing primary power.
Installing the System
Cabling and Powering On the Server
77