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7.3 Calibrating Platinum Resistance Thermometers
F Preparation
F Calibration
Short terminal
Nos.11 to 13
Change wiring.
Cont'd on next page
7.3 Calibrating Platinum Resistance Thermometers
~
AC100-240V
(AC/DC24V
)
SOURCE
• Use leads of the same thickness when connecting to the platinum
resistance thermometer.
• In the above figure, 6-dial refers to a precision resistance box, and
DMM stands for a digital multimeter. However, note that the DMM is
required only when the transfer output function is supported.
• Connect (short) the leads from terminal Nos.11 and 12.
This example describes how to calibrate a platinum resistance ther-
mometer when the transfer output function is supported. If the transfer
output function is not supported, 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
[
] (300Ω calibration display). Set the 6-dial to 300Ω. when the
value on the No.2 display has stabilized (changes of several digits
max.), press the
(3) Press the
key to display [
terminal No.11 to 13. When the value on the No.2 display has stabi-
lized (changes of several digits max.), press the
rarily store the calibration data.
(4) Next, calibrate the B-B' input. Change the wiring as follows:
Make the connection across terminal Nos.11 and 12 and the 6-dial
as short as possible. Short terminal Nos.11 and 13.
10
20
21 22
9
19
8
18
7
17
6
16
5
15
4
14
3
13
2
12
23
1
11
key to temporarily store the calibration data.
] (0Ω calibration display). Short
15
14
13
6-dial
12
11
DMM
6-dial
key to display
key to tempo-
7--7
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