Lake Shore Cryotronics 121, User Manual

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6.3 Factory Reset
It is sometimes necessary to reset instrument parameter values that are
stored in nonvolatile memory. Instrument calibration is not affected.
The factory defaults can be reset using by pressing

and

for three
seconds. All of the LED digits will illuminate when the memory has been
reset. Release the two keys and the display will return to normal opera-
tion.
6.4 Product Information
Product information for your instrument is found by pressing +/- and

for three seconds. This will display the firmware version. Any future key
you press will exit this menu.
6.5 Error Messages
The following are error messages that may be displayed by the
Model 121 during operation.
6.6 Calibration Procedure
Instrument calibration can be obtained through Lake Shore Service.
Refer to section 6.9 for technical inquiries and contact information.
Instrument configuration Default
Current polarity Positive
Current enable Off
Pre-set current range 100 nA
User current +100 nA
Display brightness 8
Keypad lock status Unlock
Power up enable* Off
* Available only in firmware release 1.3 or later.
TABLE 6-1 Factory default settings
Message Description
Err1
There is a hardware problem in the instrument memory. This error is not correctable by
the user and the factory should be consulted. Refer to section 6.9.
Err2
There is a soft error in the instrument memory. This error can be corrected by reinitializ-
ing memory. Reinitializing memory sets the instrument to defaults. Refer to section 6.3.
Err3
The calibration memory is either corrupt, or is in the default, uncalibrated state. To con-
tinue with the instrument in an uncalibrated state, press

and

simultaneously.
TABLE 6-2 Error messages