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VOLTAGE CALIBRATION
Voltage Calibration Wiring
1. Connect a precision Voltage Source with an output range of -10.000 to 60.000
mV and an accuracy of 0.03% or better to the TC- (#5) and TC+ (#3)
terminals. Cold junction calibration must be performed AFTER voltage
calibration.
2. Enter the Program Menu and step through the Program Menu list by pressing
the “SEL” button until CAL is displayed.
3. Press the “blank” button to change no to YES . Press “SEL”.
4. The display shows 00000. Use the “blank” button to increment the access
code to 00006. Press and hold “SEL”.
5. After entering the correct access code, the unit will display IN1 . Follow the
table below for calibration sequence.The unit displays CALC for about 3
seconds after pressing the “SEL” button before proceeding to the next input
point.
COLD JUNCTION CALIBRATION
Cold Junction Calibration Wiring
This procedure must be performed AFTER an accurate voltage calibration.
The ambient temperature at which this calibration should be performed is 15 to
35 °C (59 to 95 °F). A Temperature indicator with 0.1 °C resolution and
accuracy is required to perform this calibration.
1. Enter Programming Menu, and verify the following:
tyPE = probe being connected to the unit.
CJC = YES
dISP = 0.0 ° C
OFSEt = 0
Make any necessary changes to programming.
2. Connect a thermocouple probe of known accuracy and type (J, K, E, T, or N)
to the CUB4TC. The probe should match the one selected in programming.
3. Connect a reference temperature probe to measuring end of the CUB4TC
DISPLAY
IN1
IN2
IN3
IN4
IN5
IN6
IN7
IN8
PARAMETER
-10.000 mV
0.000 mV
10.000 mV
20.000 mV
30.000 mV
40.000 mV
50.000 mV
60.000 mV
ACTION
Apply -10.000 mV, wait 5 sec., press SEL
Apply 0.000 mV, wait 5 sec., press SEL
Apply 10.000 mV, wait 5 sec., press SEL
Apply 20.000 mV, wait 5 sec., press SEL
Apply 30.000 mV, wait 5 sec., press SEL
Apply 40.000 mV, wait 5 sec., press SEL
Apply 50.000 mV, wait 5 sec., press SEL
Apply 60.000 mV, wait 5 sec., press SEL
thermocouple.The two probes should be shielded from air movement and
allowed sufficient time (15 minutes minimum) to equalize in temperature.
(As an alternative, the CUB4TC thermocouple probe may be placed in a
calibration bath of known temperature.)
4. Compare the unit display with reference temperature indicator (or calibration
bath). If the displayed unit temperature does not equal the reference probe
temperature, calculate the CJ error as follows:
CJ Error = reference probe temperature - CUB4TC displayed temperature
5. Enter the Program Menu and step through the Program Menu list by pressing
the “SEL” button until CAL is displayed.
6. Press the “blank” button to change no to YES . Press “SEL”.
6. After voltage calibration is complete, the unit will return to the CAL program
item. Exit programming and verify various points from -10.00 to 60.00
mVDC using the Voltage Calibration Check procedure to ensure that the
calibration is correct.
7. Repeat calibration if necessary.
6
7. The display shows 00000. Use the “blank” button to increment the access
code to 00003. Press and hold “SEL”.
8. After entering the correct access code, the display will alternate between CJC
and the current cold junction compensation value.
9. If the current CJC value is 0.0 °C or 59.9 °C, set the CJC value to the current
ambient temperature, exit calibration, and repeat the CJC calibration
procedure.
10. Otherwise, the new value to be entered is the sum of the current value and
the CJ Error recorded previously.
11. Exit the Programming Menu and repeat the calibration from Step 4 to verify
accuracy.
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