List of parameters, Maintenance, 1 calibration apparatus – Yokogawa JUXTA VJH7 User Manual
Page 5: 2 calibration procedure, Fig. 11.1
5
All Rights Reserved. Copyright © 1999, Yokogawa M&C Corporation
IM 77J01H07-01E
10.LIST OF PARAMETERS
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11.MAINTENANCE
The product starts running immediately when the power is turned on;
however, it needs 10 to 15 minutes of warm-up before it meets the
specified performance.
For cleaning the instrument, use a soft and dry cloth.
11.1 Calibration Apparatus
● A voltage and current generator (Yokogawa 7651 or the
equivalent)
● A voltmeter (Yokogawa 7562 or the equivalent)
● A precision resistor of 250
⍀
±
0.01%, 1 W (for current output)
11.2 Calibration Procedure
Connect the instruments as shown in Fig. 10.1. First adjust the out-
put-1 signal and then the output-2 signal.
Produce input signals equivalent to 0, 25, 50, 75, and 100% of the
input span from the voltage and current generator to the isolator.
Then, check that the isolator’s output signal shows voltages corre-
sponding to 0, 25, 50, 75, and 100% of the input span within the
rated accuracy range.
If the output signal is out of the rated accuracy range, adjust the
output signal level using the Handy Terminal (JHT200).
10
11
3
2
1
4
5
6
7
8
9
11
10
8
L+
N-
GND
Power supply
9
7
Analog output
Output-1 signal
Voltmeter
R
R: For current output using 250
Ω
precision resistor
Voltage and
current
generator
+
-
5
2
Analog output
Output-2 signal
Voltmeter
R
R: For current output using 250
Ω
precision resistor
+
-
Input signal
3
1
+
-
Analog input
R
R: 100
Ω
Externally connected
for current input
Shunt resistor
(Externally connected
for current input)
Fig. 11.1