4.5 Calibration
E5CK
4--13
This example describes how to calibrate a thermocouple when the transfer
output function is supported. If the transfer output function is not sup-
ported, skips steps (7) to (10).
(1) When [
] is displayed, the 30-minute timer is displayed on the
No.2 display and counts down. This timer serves as a guide for the
aging time when aging is required.
(2) First, calibrate the main input. Press the
key to display [
]
(50mV calibration display). Set STV output to 50mV. When the value
on the No.2 display has stabilized (changes of several digits max.),
press the
key to temporarily save the calibration data.
(3) Press the
key to display [
] (0mV calibration display). Set
STV output to 0mV. When the value on the No.2 display has stabilized
(changes of several digits max.), press the
key to temporarily save
the calibration data.
(4) Next, calibrate the cold junction compensator. Press the
key to
display [
] (310mV calibration display). Set STV output to
310mV. When the value on the No.2 display has stabilized (changes of
several digits max.), press the
key to temporarily save the calibra-
tion data.
(5) Press the
key to display [
] (0mV calibration display). Set
STV output to 0mV. When the value on the No.2 display has stabilized
(changes of several digits max.), press the
key to temporarily save
the calibration data.
(6) Finally, calibrate the bias compensation value. Disconnect the STV,
and enable the thermocouple of the cold junction compensator. When
carrying this out, make sure that the wiring on the STV is discon-
nected.
Make sure that the cold junction compensator is set to 0
_
C and press
the
key. The display changes to [
] (calibration display for the
bias compensation value). When the value on the No.2 display has sta-
bilized (changes of several digits max.), press the
key to tempo-
rarily save the calibration data.
(7) Next, calibrate the transfer output function. If the transfer output
function is not supported, skip to step (11). Press the
key. The dis-
play changes to [
] (20mA calibration display).
(8) Set the output to 20mA by the
or
keys while monitoring the
voltage on the digital multimeter. In the example on the left, the dis-
play indicates that the value two digits smaller than before calibra-
tion is “20mA”.
(9) Press the
key. The display changes to [
] (4mA calibration
display).
(10) Set the output to 4mA by the
or
keys while monitoring the
voltage on the digital multimeter. In the example on the left, the dis-
play indicates that the value two digits smaller than before calibra-
tion is “4mA”.
(11) Press the
key until the display changes to the data save display.
Press the
key. The No.2 display changes to [
], and two
seconds later the calibration data is saved to internal memory. If you
press the
key when the No.2 display reads [
], the calibration
data is invalidated.
(12) This completes calibration of the thermocouple 1 group. Press the
key to return the display to [
].
F
Calibration:
thermocouple 1
