Fluke 9100 Series, Руководство пользователя

Страница: 182 / 274

10.2-8 Section 10: Calibrating the Model 9100: Calibration Mode
Final Width = 215mm
TODAYS DATE TIME
10.2.5 Cold Junction Calibration
10.2.5.1 Rationale
The Cold Reference Junctions used in the Thermocouple Temperature function are
housed in an external module ('CJC Pod'), whose internal temperature is monitored
automatically by the host 9100. A CJC pod is calibrated for use with a particular host 9100
unit, and is not interchangeable between 9100s unless a recalibration is carried out. The
calibration is performed by measuring the temperature of the reference junctions
externally, then entering the measured value via the front panel, or remotely via the IEEE-
488 bus.
10.2.5.2 Selecting COLD JUNC CALIB
Pressing the COLD JUNC CALIB softkey in the Calibration Mode screen presents the
CJ Temperature Cal screen, with two active screen keys: EXIT and CALIB:
CJ Temperature Cal
Use numeric keys to enter the
temperature of the cold junction
before calibration
E X I T C A L I B
EXIT returns to the Calibration Mode screen.
CALIB performs the calibration, as part of the procedure at paras 10.2.5.7.
• If the 'CALIB' screen key is pressed before a numeric value has been fully entered
(including pressing the
↵
key), then the following message will appear:
10.2.5.3 Entering Temperature Values
While performing the calibration, there are three major errors which could give rise to
screen messages. These appear in a rectangle above the text already on the screen:
A valid Cold Junction
temperature is required
• If the 'CALIB' screen key is pressed after entering a numeric value, but when the
Reference Junction module is not plugged in, then the following message will appear:
Invalid CJC measurement —
default to 25
°
C
• If the 'CALIB' screen key is pressed after entering a numeric value which is outside
the range 0-50, then the following message will appear:
Temperature must be within
the range ØØ.ØØ-5Ø.ØØ