GEInstallation and Maintenance Manual

are operating correctly. You should replace modules that are not operating 

correctly with a spare. 

When performed properly, you may remove modules from or install modules into 

the rack while power is applied to the rack. Refer to Section 3 for the proper 

procedure. 

The 3500 Monitoring System is a high precision instrument that requires no 

calibration. The functions of the 3500 modules, however, require verification at

regular intervals. You should verify all modules in the 3500 Monitoring System at 

these maintenance intervals. The procedures in the Maintenance and 

Troubleshooting sections of the module manuals describe the verification and 

troubleshooting process. 

5.2 Choosing a Maintenance Interval 

Use the following approach to choose a maintenance interval: 

1. Start with an interval of 1 year and then shorten the interval if any of the 

following conditions apply: 

• the monitored machine is classified as critical, or 

• the 3500 rack is operating in a harsh environment such as in 

extreme temperature, high humidity, or a corrosive atmosphere. 

2. At each interval, use the results of the previous verifications and ISO 

Procedure 10012-1 to adjust the interval.