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6
Performance Tests and Calibration
Performance Verification Tests
140
Use the following performance verification tests to verify the
measurement performance of the U1253A true RMS OLED
multimeter. These performance verification tests are based on
the specifications listed in the instrument data sheet.
These performance verification tests are recommended as
acceptance tests when you first receive the instrument. After
acceptance, you should repeat the performance verification
tests at every calibration interval (to be performed before
calibration to identify which measurement functions and
ranges require calibration).
If any or all of the parameters fail the performance
verification, then adjustment or repair is required.
Adjustment is recommended at every calibration interval. If
adjustment is not made, you must establish a 'guard band',
using not more than 80% of the specifications, as the
verification limits.
Carry out the performance verification tests according to
Table 6- 2
on page 141. For every listed step:
1 Connect the calibration standard terminals to the
appropriate terminals on the U1253A true RMS OLED
multimeter.
2 Set up the calibration standard with the signals specified
in the "Reference signals/values" column (one setting at a
time, if more than one setting is listed).
3 Turn the rotary switch of the U1253A true RMS OLED
multimeter to the function being tested, and choose the
correct range, as specified in the table.
4 Check whether the measured reading falls within the
specified error limits from the reference value. If yes, then
this particular function and range does not require
adjustment (calibration). If no, then adjustment is
necessary.
U1253A User's and Service Guide
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