VX4237 Digital Multimeter Module User Manual
E–1
Appendix E: User Service
This appendix provides information about user service. For additional service
assistance, please contact your Tektronix field office or representative.
Preventive Maintenance
You should perform inspection and cleaning as preventive maintenance.
Preventive maintenance, when done regularly, may prevent VX4237 malfunction
and enhance reliability. Inspect and clean the VX4237 as often as conditions
require by following these steps:
1. Turn off power and remove the VX4237 from the VXIbus mainframe.
2. Remove loose dust on the outside of the instrument with a lint-free cloth.
3. Remove any remaining dirt with a lint-free cloth dampened with water or a
75% isopropyl alcohol solution. Do not use abrasive cleaners.
User-Replaceable Parts
There are no user-replaceable parts in the VX4237. If you suspect a failure,
contact your Tektronix field office or representative for assistance.
Adjustment
The VX4237 provides full external calibration of all ranges and functions
through the VXIbus. Calibration commands are programmed using the
IEEE-488.2 command set.
The DMM should be periodically calibrated against external inputs of known
value. The recommended adjustment interval is at least every 2000 hours of
operation. The differences in the reading of the DMM and the known value of
the input are stored as calibration constants in the non-volatile memory of the
VX4237. The VX4237 assumes that nominal values are used, unless the user
specifies otherwise.
During normal use, the VX4237 calculates and applies any necessary calibration
corrections using the most recently stored calibration constants for the parame-
ters of the measurement in progress. In this manner, each measurement made by
the DMM receives an individual calibration correction using the stored calibra-
tion constants.
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