36 cHAPTER 4: Operation
Model 425 Gaussmeter
When relative mode is turned on, the present reading will be captured and made the
new relative setpoint. It is also possible to manually set a new relative setpoint
through the computer interface.
Menu navigation:
Relative (toggle)
Default: off
Interface command: REL, RELSP
The relative mode is turned off when the instrument is powered off and when chang-
ing between DC and RMS measurement modes.
4.6 Locking and
Unlocking the
Keypad
The keypad lock feature prevents accidental changes to parameter settings. When
the keypad is locked, all parameter settings may be viewed, but none may be changed
from the front panel. The Max Reset key remains active even when the keypad is
locked.
When you lock the keypad, a message stating “Keypad Locked” displays for 2 s.
Changes attempted to any setting result in a brief display of the “Keypad Locked”
message. When you unlock the keypad, a message stating “Keypad Unlocked” dis-
plays for 2 s. You are now able to change all Model 425 parameters.
Menu navigation:
Enter (press and hold for 3 s; toggle)
Default: unlocked
Interface command: LOCK
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