Yokogawa JUXTA VJU7 - Manual (Page 8)

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All Rights Reserved. Copyright © 1999, Yokogawa M&C Corporation IM 77J01U07-01E 4th Edition Feb. 09, 2007-00
12. MAINTENANCE
The product enters the operable status as soon as the power is turned on, but requires 10 to 15 minutes of warm-up to meet the
performance requirements.
12.1 Calibration Apparatus
● Calibrator (Yokogawa Meters & Instruments’ CA71 or equivalent): 1
● Temperature sensor (Yokogawa Meters & Instruments’ B9108WA or equivalent): 1
● Digital Multimeter (Yokogawa’s 7561 or equivalent): 1
● Precision resistor of 250 Ω ± 0.01%, 1 W: 1
● Setting tool for adjustment (Refer to “8.2 Connecting the Setting Tools” in this manual.)
12.2 Calibration Procedure
(1) Connect the instruments as shown in Fig.12.1.
First adjust the output-1 signal and then the output-2 signal.
(2) Produce the input signal equivalent to 0, 25, 50, 75 and 100% of the input span from the calibrator. Check that the converter’s
output signals show voltages corresponding to 0, 25, 50, 75 and 100% within the rated accuracy range.
If the output signal is out of the rated accuracy range, adjust the output signal level using the VJ77 PC-based Parameters Set-
ting Tool or JHT200 Handy Terminal.
Refer to the user’s manual for VJ77 PC-based Parameters Setting Tool (IM 77J01J77-01E) or for JHT200 Handy Terminal (IM
JF81-02E).
10 11
3 2 1
4 5 6
7 8 9
3
1
4
+
A
B
B
–
Thermocouple Input
RTD Input
Calibrator
Calibrator
Calibrator
RJC
L+
N–
GND
Power Supply
9
7
Analog output
Output 1
3
1
+
–
mV Input
R
+
–
3
1
4
5
2
11
8
10
Analog output
Output 2
R
+
–
Temperature sensor
(B9108WA)
Digital
multimeter
Digital
multimeter
5
6
5
2
Alarm 2
Alarm 1
Calibrator
Calibrator
ALM2 (NO)
COM
ALM1 (NO)
COM
R: 250 Ω precision resistor for
current output
R: 250 Ω precision resistor for
current output
Fig. 12.1