P
AGE
45
TABLE 5-1 CALIBRATION PROCEDURES
Calibration
Procedure
Description
CAL 1
Re-initialization of Program and Tune Mode values.
CAL 2
Main Calibration used by all inputs. This is the only calibration required
for voltage and millivolt inputs.
CAL 3
Cold Junction Compensation calibration used to correct for component
variation in CJC circuit.
CAL 4
Cold Junction utility. The temperature of the cold junction is displayed.
No adjustment is made with this procedure.
CAL 5
RTD input calibration used to correct for component differences in the
RTD input circuit.
CAL 6
CJC turn on/off
CAL 7
Factory Use Only
5.2.1 CAL 1 PARAMETER INITIALIZATION
This procedure is performed to erase the information that was entered in the Program and
Tune modes . All parameters will be reset to default values. Prior to beginning this procedure
record the Program and Tune mode parameters so that they can be
re-entered. No special test equipment is required.
With CAL1 displayed, depress and hold the DOWN key, then press the SCROLL key. The
display will momentarily go blank. Release the keys. CAL1 will reappear on the display. This
calibration can be done again or another may be selected.
5.2.2 CAL2 MAIN CALIBRATION
This procedure determines and saves calibration values which correct for component vari-
ations relating to the input measuring function of the instrument. This is the only calibration
required for the volt and millivolt inputs. Additional calibration procedures are required for
thermocouple and RTD inputs.
A 50.00
±
.01mVDC source is required for calibrating. In addition make sure that JU1 on the
Processor board is in the “non volt” position. See Appendix A-2 (page 60).
Make sure all input wiring is disconnected. Short the input terminals 1 and 3 or apply 0.00
mV to the input. With CAL2 displayed, press and hold the DOWN key, then press the
SCROLL key. Release both keys and the instrument will display hLd1. Depress the DOWN
key; dELy will appear for up to ten seconds, then SCAn will appear for up to ten seconds. If
the calibration reference number which appears is not between -50 and +50, proceed per
note below. Otherwise, connect a 50.00
±
.01mV source to the input terminals. Press the
DOWN key and deLy will be displayed for ten seconds and then SCAn for ten seconds. Then
CAL2 will reappear. If there is a problem, the appropriate error code will be displayed.
Restore JU1 to the position necessary for the input type.
NOTE: If the calibration reference number falls outside the -50 to +50 range, depress
the SCROLL key and CAL2 will be displayed. Depress the DOWN key and perform the
calibration once more. Repeat the calibration until the number falls within the toler-
ance limits. If the calibration number remains outside these limits, check the connec-
tions to the test equipment and try the calibration again. If the number still does not
approach the tolerance limits contact an Applications Service Engineer at the factory
or a local representative.
