Service 2
Keysight 53210A/53220A/53230A Assembly Level Service Guide 133
Option 106 microwave channel frequency calibration
The following procedure should be performed when Option 106 (6 GHz Microwave
channel) with any Option 106 firmware revision other than FW Rev 27 is installed
as Channel 2 in a 53210A or Channel 3 in a 53220A or 53230A. See Chapter 6,
"Backdating" for the procedure to calibrate Option 106 with FW Rev 27. (Refer to
“Determine the counter firmware version” on page 119.)
1 First, run the counter Self-Test as described under “Performing the counter
self-test” on page 169. A successful self-test procedure verifies that the
counter is operational and ready for calibration.
2 Unlock the counter by performing the procedure “To unlock the counter for
calibration:” on page 116. Key sequence:
[Utility] / (Cal AutoCal) / enter <code> / (Unlock Cal)
3 Set up an external microwave frequency source for a 500 MHz sine wave at
-27 dBm. If the source has an ‘output enable’ feature, turn it OFF at first (for
the zero-calibration procedure).
4 Connect the microwave frequency source to Channel 3 on the counter front
panel. (Channel 2 for a 53210A.) See Figure 2-7.
Figure 2-7 Microwave source connection to Channel 3
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