
P
AGE
49
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
aproach the tolerance limits contact an Applications Service Engineer at the factory or
a local representative.
Error Recover - see 5.4 (page 56) for details. However, be sure that the millivolt source is
securely connected, functioning properly and the polarity is correct. Press the DOWN key to
bring the instrument back to dELy and try the calibration again. The calibration can be exited
at anytime. hLd1 or the reference number is displayed by pressing the SCROLL key.
CAL 2 QUICK CALIBRATION
This routine will allow the operator to execute a rough calibration on their unit via the keypad
with no other equipment or disturbance to established wiring. It is intended to provide a partial
recovery from a calibration corruption where the necessary equipment indicated in Cal 2-5
may not be available. It should be noted that this is not intended as a substitution to the main
calibration procedure described earlier and may considerably deter from the accuracy of the
instrument.
With CAL2 displayed, press and hold the DOWN ARROW key, then press the SCROLL key.
Release both keys and the instrumet will display hLd1. Press and hold the UP ARROW key,
then press the SCROLL key. The display will momentarily blank and then CAL1 will be
displayed. Release both keys and depress the UP ARROW key. CAL will be displayed.
5.2.3 CAL 3 COLD JUNCTION COMPENSATIO
N
This procedure determines and saves calibration values which correct for component vari-
ations relating to the cold junction compensation. This calibration must be preceded by CAL2
the main calibration, to properly calibrate the instrument. These two calibrations are all that is
needed for proper operation with thermocouple inputs.
Test equipment: : one type J thermocouple and one mercury thermometer, accurate to
±
.25
degrees C or equivalent are required.
Make sure all input wiring is disconnected and connect the J thermocouple to the input. Place
the thermometer next to the thermocouple and allow the controller to warm up for 30 minutes,
before proceeding with the calibration.
With CAL3 displayed, press and hold the DOWN key, then press the SCROLL key and the
unit will display hoLd. Release both keys. Press the DOWN key and dELy will be displayed
for ten seconds, then SCAn for ten seconds. If SCAn remains in the display for much longer
than ten seconds, refer to the the note below. The instrument will compute and display the
cold junction temperature to the nearest tenth of a degree C. Compare reading with ther-
mometer and use the UP and DOWN keys to correct the reading, if necessary. To end
procedure, press the SCROLL key and CAL3 will be displayed again.
NOTE: If the instrument continues to display in SCAn, proceed as follows. With SCAn
displayed, press the SCROLL key. The instrument will display hoLd. Press the UP key .
The instrument will begin the calibration procedure with a default value and proceed to dELy.
Complete calibration as described above.
Error recovery - see section 5.4 (page 56) for details on specific errors. The calibration can
be exited at any time. hoLd is displayed by pressing the SCROLL key.
Содержание MIC 6000
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