Calibration Procedure - Keysight 537A Operating Note

Calibration Procedure

Test equipment recommended for testing the 537A are listed in
that recommended may be substituted if their performance equals or exceeds the minimum
required specifications given.
specifications. If dial accuracy is not within listed specifications, adjust 537A as detailed in the
Calibration Alignment Procedure, as follows.
1 Remove knob (1).
2 Remove base (11) retaining screws. With base retaining screws removed, place the 537A in
upright position and make electrical hookup for OVERALL ACCURACY TEST.
3 In the original high-frequency end setting, 12.4 GHz is set almost one-half turn (about 150
degrees) counterclockwise from the stop. The dial (5) is held to the dial holder (10) by two set
screws (9). Check frequency accuracy at 12.4 GHz, and if not within overall accuracy
specification, loosen set screws (9) and slip dial. The set screws are loosened from inside the
dial holder; the dial must be rotated about 6 turns before the access holes become visible.
4 The low-frequency end adjustment is made at 3.7 GHz by moving capacitive load with two cap
screws. This adjustment should not change the high frequency setting.
5 Check dial accuracy in vicinity of 3.7 to 4.1 and 8.2, 12.0, and 12.4 GHz. Reposition the dial, or
capacitive load if a compromise is necessary
6 If accuracy specifications cannot be met, further disassembly is not recommended. The unit
should be returned to your local Keysight Technologies Sales and Service office.
Keysight 537A Operating Note
Figure 2 and Figure 3 list procedures for checking instrument
Calibration Procedure
Table 2.Test equipment other than
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