8
RS-925D
8
Maintenance
Chapter 5
MaInTEnanCE
5.1 Maintainability and Reliability
It is possible to maintain Model RS-925D indefinitely.
It is reliable due to its closed design and sealed
switches and resistors. It is possible to adjust the unit,
if necessary, because it has 6 trimmable decades. The
unit is resistant to electromagnetic interference (EMI)
because of its metal enclosure.
5.2 preventive Maintenance
Keep the unit in a clean environment. This will help
prevent possible contamination.
The Model RS-925D is packaged in a closed case and
uses completely sealed switches. This limits the entry
of contaminants and dust to the inside of the switches.
If it is maintained in a clean or air-conditioned envi-
ronment, cleaning will seldom be required.
Should cleaning be needed:
1. Remove the 4 housing screws from the side
of the instrument, and remove the housing.
2. Remove any dust or debris using optical
grade dry compressed air or a clean brush.
3. Replace the housing and reattach the 4 hous-
ing screws.
The front panel should be periodically cleaned to
eliminate any leakage paths from near or around the
binding posts. To clean the front panel:
Wipe the front panel clean using alcohol and a
lint-free cloth.
5.3 Calibration
The Model RS-925D may be employed as a stand-
alone instrument or as an integral component of a
system. If used as part of a system, it should be
calibrated as part of the overall system to provide an
optimum system calibration.
If the RS-925D is employed as a stand alone device,
the following should be observed:
•
Calibration Interval
•
General Considerations
•
Required Equipment
•
Calibration Procedure
5.3.1 Calibration Interval
The recommended RS-925D Series calibration inter-
val is twelve (12) months.
If the instrument is used to transfer resistance values
only, recalibration is not required, assuming that there
has been no drastic change in the deviations of any
individual resistors.
