2Service
114 Keysight 53210A/53220A/53230A Assembly Level Service Guide
– Secure Code displays either all dashes ( --- ) or an operator-entered security
code that has not yet been accepted by the counter.
– Display softkey annunciators show:
–If “Unlock Cal” is displayed for the second softkey from the left, the counter is
locked against calibration. (See step 1.)
–If “Lock Cal” is displayed for the second softkey from the left, the counter is
unlocked and ready for calibration.
To lock the counter against calibration
Display softkey annunciators show:
To lock the counter:
1 Using the front panel knob and right/left arrow keys, enter the current (or a
new) security code in the data entry area (see Figure 2-1 and Figure 2-2).
2 The characters available to use for the security code are selectable by rotating
the knob on the front panel for each character position in the code:
– A to Z, underline character, ( _ ), and 0 to 9.
When the counter security is locked to prevent unauthorized calibration, the
Unlock Cal softkey is available. When the counter security is unlocked, the Lock
Cal softkey replaces the Unlock softkey.
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