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8.2 Routine Maintenance
Calibrate the instrument routinely to ensure conformity to specifications. Calibration is to be performed by
qualified service personnel only.
Clean the front panel with a damp cloth. If needed, use a detergent containing no abrasives. Always clean
the front panel with the bezel closed. Do not use solvent cleaners.
8.3 Set Mode
Select this to change the operating mode to Online or Program.
ATTENTION
Changing to ONLINE mode by pressing any of the Display buttons can cause incorrect values to be displayed.
The values will correct themselves in a few seconds. To avoid this potential annoyance, change to online
mode through SET MODE instead of through the Display buttons.
8.4 Calibrate Analog Inputs
Select an AI for calibration. Only one Analog Input is needed for calibration, regardless of the number of
inputs present.
WARNING
Disconnect power to all terminals before connecting or disconnecting calibration leads. Hazardous
voltage is present on the mains terminals and may be present on other terminals. More than one switch
may be required to de-energize the unit before servicing.
ATTENTION
Time-stamp and description of successful calibrations are stored to disk in the Event File.
Calibrating EMF Inputs
Step
1
Connect an adjustable precision 25 mV - 5 V voltage source to the terminals of the selected TC or
EMF input.
2
Adjust the source to 25 mV. Select the calibration voltage 25 mV and press Enter to calibrate the
selected range. A message CALIBRATING will appear until calibration is complete. If it fails, a
failure message is displayed.
3
Repeat for 75 mV, 1.0V and 5.0V
4
Press Menu to restore the Main Maintenance Menu when finished.
12/00
Table 8-2 Calibrate EMF Input Procedure
Action
VPR & VRX – User Manual
Maintenance
257
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