Service 2
Keysight 53210A/53220A/53230A Assembly Level Service Guide 121
Calibration cycle
The calibration cycle for the Keysight 53210A, 53220A, and 53230A Counters is
1-year. The counter should be calibrated at least once every 12 months to ensure
specification accuracy.
Calibration string:
The Cal String on the Calibrate Information page is operator-modifiable and can be
used to remotely enter any current or historical data/information up to 40
characters long. The string may include the characters A-Z, 0-9, and special
characters like @, #, *, etc.
The CAL STRing can be entered remotely as follows:
– Send CALibration:STRing “<string>” .
–
(Example:) output <addr
ess> ; CAL:STR “last cal 8-15-2010”
– CALibration:STRing? reads the current cal string contents from the counter:
– “last cal 8-15-2010”
Internal reference oscillator calibration
1 First, run the counter Self-Test as described in“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 a low-jitter, low-noise, external frequency source, such as the Stanford
Research CG635, for a 10 MHz square wave at 1 Vpp, 0 volts offset, 50% duty
cycle.
If your source has an output enable feature, turn it ON.
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