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7-1
Chapter 7
Maintenance
Title Page
Introduction ....................................................................................................... 7-3
Cleaning............................................................................................................. 7-3
Line Fuse ........................................................................................................... 7-3
Selftest Diagnostics and Error Codes................................................................ 7-4
Performance Tests............................................................................................. 7-4
Accuracy Verification Test........................................................................... 7-7
Channel Integrity Test................................................................................... 7-8
Thermocouple Measurement Range Accuracy Test ..................................... 7-9
Four-Terminal Resistance Test ..................................................................... 7-10
Thermocouple Temperature Accuracy Test.................................................. 7-10
Open Thermocouple Response Test ............................................................. 7-11
RTD Temperature Accuracy Test................................................................. 7-13
RTD Temperature Accuracy Test (Using Decade Resistance Source).... 7-13
RTD Temperature Accuracy Test (Using DIN/IEC 751 RTD)................ 7-14
Digital Input/Output Verification Tests........................................................ 7-15
Digital Output Test ................................................................................... 7-15
Digital Input Test...................................................................................... 7-16
Totalizer Test............................................................................................ 7-17
Totalizer Sensitivity Test.......................................................................... 7-18
Dedicated Alarm Output Test ....................................................................... 7-18
External Trigger Input Test........................................................................... 7-21
Calibration......................................................................................................... 7-21
Variations in the Display................................................................................... 7-22
Service............................................................................................................... 7-22