Performance Tests and Calibration 6
Keysight U1253B User’s and Service Guide 187
Adjustment Considerations
To adjust the instrument, you will need a test input cables and connectors set for
receiving the reference signals (for example, from the Fluke 5520A calibrator or
Keysight 33250A function/arbitrary waveform generator) and a shorting plug.
Adjustments for each function should be performed with the following
considerations (where applicable):
1 Allow the instrument to warm up and stabilize for 5 minutes before performing
the adjustments.
2 Ensure that during the adjustment, the low-battery indicator does not appear.
Replace/recharge the battery as soon as possible to avoid false reading.
3 Consider thermal effects as you connect test leads to the calibrator and this
instrument. It is recommended that you wait for 1 minute after connecting the
test leads before you begin the calibration.
4 During ambient temperature adjustment, ensure that the instrument has been
turned on for at least 1 hour with the K-type thermocouple connected between
the instrument and the calibration source.
After each successful adjustment, the secondary display briefly shows “PASS”. If
the calibration fails, the instrument emits a beep, and an error code is shown
momentarily on the secondary display. For a list of calibration error codes, refer
to “Calibration error codes” on page 201. In the event of a calibration failure,
correct the problem and repeat the procedure.
Never turn off the instrument during calibration. This may delete the calibration
memory for the present function.
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