Lake Shore Model 421 Gaussmeter User’s Manual
6-8 Service
Front
Rear
Transformer
Fuse
Power Inlet
U36
JMP2
3V
10V
Operating Software
EPROM (U36)
Refer to Paragraph 6.7
Corrected Analog Output (JMP2)
3V position is for ±3V = ±Full Scale
10V position is for ±10V = ±Full Scale
Must be in 3V position for rated accuracy.
Changing to 10V requires instrument be recalibrated.
Contact Lake Shore for details.
C-421-6-6.eps
Figure 6-6. Location of Operation Software EPROM and Analog Output Jumper
6.8 ERROR MESSAGES
The following is a list of Model 421 error messages that may be seen during normal operation.
OL Field range has been exceeded. Refer to Paragraph 3.5 to change Range.
** No Probe ** No probe attached to the instrument at power up. Power the instrument off, attach a
probe, and power it on again.
Locked Keypad is locked to prevent accidental parameter changes. To unlock keypad refer
to Paragraph 3.13.
Error 1 NOVRAM memory is physically malfunctioning. Contact Lake Shore service for
repair.
Error2 NOVRAM memory is not initialized properly. Memory can be reinitialized as
described in Paragraph 3.15. This operation will not restore calibration data that may
have been corrupted. Instrument calibration should be checked after any Error 2
condition. Contact Lake Shore service for repair or calibration.
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