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7.3 Calibrating Platinum Resistance Thermometers
F Preparation
F Calibration: plati-
num resistance
thermometer 1
Short terminal
Nos. 11 to 13
Change wiring.
Short terminal
Nos. 11 to 13
Continued on next page
7.3 Calibrating Platinum Resistance Thermometers
• The calibration procedure is divided into two descriptions, one for group
1 platinum resistance thermometers (Jpt100, Pt100 : -199.9 to 650.0_C)
and group 2 platinum resistance thermometers (Pt100 : -100.0 to
100.0_C).
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.
• Connect (short) the leads from terminal Nos. 11 and 12.
(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
key to temporarily save the calibration data.
(3) Press the
key to switch to the [
Short terminal Nos. 11 to 13. When the value on the No.2 display
has stabilized (changes of several digits max.), press the
temporarily 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.
(5) Press the
key to display [
the 6-dial to 10Ω. When the value on the No.2 display has stabilized
(changes of several digits max.), press the
store the calibration data.
(6) Press the
key to display [
terminal Nos. 11 to 13. When the value on the No.2 display has sta-
bilized (changes of several digits max.), press the
rarily store the calibration data.
10
20
21 22
9
19
8
18
7
17
6
16
5
15
4
14
3
13
2
12
23
1
11
] (0Ω calibration) display.
15
14
13
6-dial
12
11
] (10Ω calibration display). Set
] (0Ω calibration display). Short
6-dial
key to display [
]
key to
key to temporarily
key to tempo-
7--7
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