How do I put the Model 197, 175, 485 into Cal Enable mode?
Depending on the firmware revision, there are three methods to put these instruments in the CAL ENABLE mode.
Procedure for CAL ENABLE for Revision B firmware:
In Service Manual, delete paragraph 5.6.3 Calibration Jumper on page 5-4 and Figure 5-2 on page 5-5 and replace with the following:
5.6.3 Calibration Storage Enable
The Model must be in the calibration storage enable mode in order to realize storage of calibrations constants into the NVRAM. If the instrument is not placed in this mode, subsequent calibration will be lost when the instrument is turned off. Perform the following steps to place the unit in storage enable mode:
Note: Step 2 and 3 put the instrument in the CAL ENABLE mode, while step 5 puts the instrument in the CAL mode.