66 cHAPTER 4: Operation
Model 335 Temperature Controller
A three-digit keypad lock code locks and unlocks the keypad. The default code is 123.
The code can be changed only through the computer interface. If instrument parame
-
ters are reset to default values, the lock code resets also. The instrument cannot reset
from the front panel with the keypad locked.
To lock the keypad, press and hold Enter for 5 s. Use the numeric keypad to enter the
three-digit lock code. If the lock code is accepted, *** Keypad Locked *** will be dis
-
played for 3 s and the display will return to normal. Changes attempted to any param-
eters result in a brief display of the *** Keypad Locked *** message.
To unlock the keypad, press and hold Enter for 5 s. Use the numeric keypad to enter
the three-digit lock code. If the lock code is accepted, *** Keypad Unlocked *** will be
displayed for 3 s and the display will return to normal. All Model 335 parameters are
now accessible.
Interface Command: LOCK
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