12-21
IM MV1000-01E
Troubleshooting and Maintenance
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App
Index
12.4 Calibrating the MV
It is recommended that the MV be calibrated once a year to assure its measurement
accuracy.
Calibration service is also provided by YOKOGAWA dealers.
For details, contact your nearest YOKOGAWA dealer.
Required Instruments
Calibration instruments with the following resolution are required for calibrating the MV.
Recommended Instruments
• DC voltage standard: 9100 by FLUKE or equivalent
Main specications
Output accuracy: ±(0.005% + 1 µV)
• Decade resistance box: Yokogawa Meters & Instruments Model 2793-01
or equivalent
Main specications
Accuracy of output range 0.1 to 500 Ω: ±(0.01%
+2 mΩ)
Resolution: 0.001 Ω
• 0°C standard temperature device:
ZC-114/ZA-10 by Coper Electronics or equivalent
Main specications
Standard temperature stability accuracy: ±0.05°C
For information on purchasing the calibration instruments, contact your nearest
YOKOGAWA dealer.
Calibration Procedure
1.
Wire the MV and the calibration instrument as shown in the following figure, and
adequately warm up the instruments (the warm-up time of the MV is at least 30
minutes).
2.
Check that the operating environment such as ambient temperature and humidity
is within the standard operating conditions (see section 13.6).
3.
Apply appropriate input signals corresponding to 0, 50, and 100% of the input
range and calculate the errors from the readings.
If the error does not fall within the accuracy range of the specifications, contact
your nearest YOKOGAWA dealer.
Note
For thermocouple inputs, you must measure the temperature of the input terminal and apply a
voltage taking into account the reference junction temperature.
DC Voltage Measurement (Example for the MV1012)
DC voltage standardInput terminal
Screw terminal
Clamp terminal
+
–
+
–
CH1
CH2
CH3
CH4
CH5
CH6
CH7
CH8
CH9CH11
CH10CH12
+/A
/b
–/B
CH5 CH3 CH1
CH6 CH4 CH2
CH9 CH7
CH10
CH11
CH12
CH8
/b
+/A
–/B
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