51
C J COLD JUNCTION COMPENSATION
NOTE: make sure that C6 and C7 parameters are correctly
calibrated before CJ calibration.
a) Measure the temperature close to terminals 1 and 3 using an
appropriate instrument, for instance, a MEMOCAL.
b) Wait a few minutes to allow the temperature stabilization of
entire the system (compensation cable, sensor, calibrator and
instrument).
c) The displays will show "C J" and "25.0".
NOTE: This value is only a default value and it not represents
the real measurement.
Using ▲ or ▼ pushbuttons, make the readout value equal to the
temperature measured by the measuring device in tenth of °C.
The display will show an half zero at the most significant digit to
indicate the ON calibration condition.
d) Initiate the calibration routine by pushing F pushbutton.
Fig. 5.7
COLD JUNCTION COMPENSATION CHECK
The display will show "RJ" and the cold junction temperature in
tenths of °C.
Make sure that the display readout is equal to the value read on
the measuring device (MEMOCAL).
Push F pushbutton to proceed to next calibration step.
C L - ANALOG RETRANSMISSION MINIMUM RANGE VALUE
a) Connect the instrument as shown in Fig. 5.8.
b) Set J104, J105 and J107 on the option card as follow:
b) The alphanumerical display shows "C L" and the numerical
display shows a number of counts.
c) Using ▲ or ▼ pushbuttons, adjust the instrument output until
0.000mA
+0.015 mA or 00.00V + 0.0073 V is shown by the
measuring device.
1
3
+
_
Meassuring
device
Retransmission
type
Current
Voltage
J105
CLOSED
OPEN
J104
OPEN
CLOSED
Jumpers
J107
2 - 3
1 - 2
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