7.3 Calibrating Platinum Resistance Thermometer
E5AK
7--7
7.3 Calibrating Platinum Resistance Thermometer
F
Preparation
10
9
8
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6
5
4
3
2
1
30
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27
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25
24
23
22
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16
15
14
13
12
11
31 32
33
DMM
6-dial
SOURCE
AC100-240V
(AC/DC24V
)
~
·
Use leads of the same thickness when connecting to the platinum resis-
tance 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 thermome-
ter 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
key to display [
]
(300
W
calibration display). Set the 6-dial to 300
W
. 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 to switch [
] (0
W
calibration) display. Short
terminal No. 11 to 13. When the value on the No.2 display has stabi-
lized (changes of several digits max.), press the
key to temporarily
store the calibration data.
(4) Next, calibrate the B-B’ input. Change the wiring as follows.
15
14
13
12
11
6-dial
Make the connection across terminals 11 and 12 and the 6-dial as
short as possible. Short terminals 11 and 13.
(5) Press the
key to display [
] (10
W
calibration display). Set the
6-dial to 10
W
.. When the value on the No.2 display has stabilized
(changes of several digits max.), press the
key to temporarily
store the calibration data.
F
Calibration
Cont’d on next page
Change wiring.
Short terminal
Nos.11 to 13
Short terminal
Nos.11 to 13