CHAPTER 7 CALIBRATION
E5CK
7–10
7.5 Calibrating Voltage Input
F Preparation
10
9
8
7
6
5
4
3
2
1
1413
1211
DMM
STV
AC100-240V
(AC/DC24V )
~
SOURCE
Ă• In the above figure, STV refers to a standard DC current/voltage source,
and DMM refers to a precision digital multimeter. However, note that
the DMM is required only when the transfer output function is supĆ
ported.
This example describes how to calibrate a platinum resistance thermomeĆ
ter when the transfer output function is supported. If the transfer output
function is not supported, skips steps (4) to (7).
(1) When [ĂĂ
] is displayed, the 30Ćminute timer is displayed on the
No.2 display and counts down. This timer serves as a guide for the agĆ
ing time when aging is required.
(2) Press the
key. The display changes to [ ] (5 V calibration disĆ
play). Set the STV output to 5 V. When the value on the No.2 display
has stabilized (changes of several digits max.), press the
key to
temporarily store the calibration data.
(3) Press the
key. The display changes to [ ] (0 V calibration disĆ
play). Set the STV output to 0 V. When the value on the No.2 display
has stabilized (changes of several digits max.), press the
key to
temporarily store the calibration data.
(4) Next, calibrate the transfer output function. If the transfer output
function is not supported, skip to step (8). Press the
key. The disĆ
play changes to [
] (20 mA calibration display).
(5) Set the output to 20 mA by the
or keys while monitoring the
voltage on the digital multimeter. In the example on the left, the disĆ
play indicates that the value two digits smaller than before calibraĆ
tion is 20 mA".
(6) Press the
key. The display changes to [ ] (4 mA calibration
display).
(7) Set the output to 4 mA by the or keys while monitoring the
voltage on the digital multimeter. In the example on the left, the disĆ
play indicates that the value two digits smaller than before calibraĆ
tion is 4 mA".
F Calibration:
0 to 5V, 1 to 5V
Cont’d on next page
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