Keithley 175 Instruction Manual Addendum

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KEITHLEY
Model 175 Addendum
INTRODUCTION
The following information is supplied as a supplement to this manual in order to provide the user
with the latest improvements and corrections in the shortest possible time. It is recommended that
this information be incorporated into the manual immediately.
CALIBRATION
The Model 175 Multimeter has been improved to make calibration of the instrument more convenient
for the user. Later versions of the Model 175 (with Revision B or C software) can now be calibrated
without having to open up the unit.
To determine what level software your instrument has, hold in the dB button and turn on the Model
175. First, all LCD digits and annunciators turn on, then the software revision level will be displayed
(for example, Al). The instrument will then run a display test and go into troubleshooting diagnostics.
Cycle power to return unit to normal operation.
Revision A Software
If you have Revision A level software in your Model 175, then there is an internal calibration jumper
that enables permanent storage of calibration constants. In this case, follow the exact calibration pro-
cedure as it currently appears in the Model 175 Instruction Manual in paragraph 5.7 for front panel
calibration and paragraph 5.8 for calibration over the IEEE-488 bus.
175-901-03 Rev. C/2-86