Yokogawa JUXTA FH2V Isolator (Free Range Type) - Manual (Page 4)

4 IM 77J08H02-01E 1st Edition 2008.01.15-00
6. 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.
6. Calibration Apparatus
A voltage current source (Yokogawa 7651 or equivalent)
A digital multimeter, DMM (Yokogawa 7561 or equivalent)
A precision resistor of 250 Ω ±0.01%, 1W
A setting tool for adjustment (Refer to "4. Setting Parameters"
in this manual)
6.2 Calibration Procedure
1. Connect the instruments as shown below.
2 3
4 5
6 7
2
3
6
7
4
5
Ro
Setting tool
Power Supply
24V DC
Output
Input
DMM
Voltage
current
source
Ro: a precision resistor 250Ω
(in case of current output)
2 Use the voltage current source and apply signals equivalent to
0, 25, 50, 75, and 100% of the input range to the isolator.
3. Verify that the corresponding output voltages are 0, 25, 50, 75,
and 100% respectively and within the specified accuracy rating.
(Ro is used for current output.)
Use the setting tool (VJ77 Parameter Setting Tool or JHT200
Handy Terminal) to adjust the input/output signals.
Input Adjustment Procedure
(1) Input the value equivalent to 0% value of the input range
to the isolator.
(2) Read the parameter [C04: ZERO ADJ] and check the
input value.
(3) Select “INC” or “DEC” in the parameter [C04: ZERO
ADJ] to adjust.
•Adjust so that the indicated value and measured value
of
[C04: ZERO ADJ] become equal.
INC: Increase (Adjusts the increased value of the input
value)
DEC: Decrease (Adjusts the decreased value of the
input value)
RST: Reset of the adjustment value
(4) Input the value equivalent to 100% value of the input
range to the isolator.
(5) Read the parameter [C05: SPAN ADJ] and check the
input value.
(6) Adjust the span in the same way as (3).
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Output Adjustment Procedure
When adjusting 0% value of output:
(1) Set the adjustment value 0% in the parameter
[C0:
OUT 0%].
•The value equivalent to 0% of the output range will be
output, irrespective of the input.
(2) Check the output value via digital multimeter, and adjust
it in the parameter [C0: OUT 0%].
•If the indicating value of DMM deviates to the (+) side,
set (−) value equivalent to slipout; if it deviates to the (−)
side, set (+) value equivalent to slipout for adjusting the
output value to 0%.
*: The 100% value of output can be adjusted by the same
operation as the above in [C02: OUT00%]
For adjustment using a setting tool, refer to the User’s Manual for
each setting tool and “5. List of Parameters” in this manual.
Use the VJ77 of version R1.05 or later.
User’s Manual for the VJ77 [Document No.: IM 77J01J77-01E]
User’s Manual for the JHT200 [Document No.: IM JF81-02E]