Calibration
31
Calibration Status Indicator
The calibration display is accessed by pressing [
SETUP
], and then the
Next Page
softkey
three times. At the top of the display is the
Calibration Status
followed by a number.
This number is incremented after each subroutine is finished and the new constants are
saved. Doing a complete calibration increments the
Calibration Status
by 10. Because
the Calibration Status number is changed only by a re-calibration, it can be used to
confirm that previous cal constants have not been changed
.
Calibration Constant Out of Bounds
If one or more of the calibration stimuli (or measurements) were out of range during a
calibration routine, or the cabling arrangement was incorrect, the message [
Error -
Calibration Constant Out of Bounds
] will appear at the end of the routine. A general
fault with the UUT can also be indicated by this error. The fault will first have to be
rectified before repeating the entire sub-routine.
Order of Calibration
There are ten (10) sub-routines in the Calibration menu display. The sub-routines are as
follows:
•
Volts DC Measure
•
Volts AC Measure
•
Frequency
Measure
•
mA Measure
•
Volts DC Source
•
Frequency
Source
•
Ohms Source
•
mA Source
•
Ohms Measure
•
TC Measure
To completely re-calibrate these Process Calibrators, do each of the 10 sub-routines. At
the end of each sub-routines you are prompted to either save the new constants, or
abandon them and start over.
The best course is to do them in order from top to bottom. However, the first seven are
independent and can be done in any order. The last three subroutines (
mA Source, Ohms
Measure,
and
TC Measure
) are dependent on previous calibration constants, and must be
done in a specific order, as follows:
Summary of Contents for 74X Series
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Page 6: ...74X Series Calibration Manual iv...
