Appendix C: Performance Verification
General Information
This appendix begins with General Information which contains topics you
should understand before performing the procedures in this appendix. The
table Test Equipment Required follows. The performance checks are found
under Procedures.
Read the following topics before performing the performance verification
procedures in this appendix.
Purpose
The Performance Verification is used to verify the instrument against the
performance requirements listed in Table A-4 {page A-8) and to determine
the need for instrument adjustment, it may also be used as an acceptance
test or as a preliminary troubleshooting aid.
Performance Check Interval
To ensure instrument accuracy, check its performance after every 2000
hours of operation or once each year, if used infrequently. A more frequent
interval may be necessary, if the instrument is subjected to harsh environ
ments or severe usage.
Structure
The Performance Verification is structured in subparts to permit checking
individual sections of the instrument, whenever a complete verification of
performance is not required.
Each subpart begins with a list of the test equipment required for performing
the steps in that subpart. Following that equipment list is a list of all the
front-pane! control settings required to prepare the Instrument for performing
Step 1 of that subpart. The procedure steps follow.
When performing any subpart, start at the beginning and do each step
within a particular subpart-—both in the sequence presented and in its
entirety—to ensure that control-setting changes will be correct for following
steps.
Limits and Tolerances
The tolerances given in this procedure are valid for an instrument that is
operating in and has been previously calibrated in an ambient temperature
between +20° C and +30° C. The instrument also must have had at least a
20 minute warm-up period. Refer to Table A-4 for tolerances applicable to an
i
2221A User Manual
A-25
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