6-3
IM 04P03B01-01E
Maintenance
6
6.3 Calibrating the Recorder
Calibrate the measured value against the input.
It is recommended that the recorder be calibrated once a year to assure its
measurement accuracy.
For details regarding calibration, contact your nearest YOKOGAWA dealer.
Required Instruments
A calibration instrument with appropriate resolution is required for calibrating the
recorder.
Recommended Instrument
• DC voltage standard: Model 5520A by FLUKE or equivalent
Main Specifications
Output accuracy: ±(0.005% + 1 µV)
• Decade resistance box: Yokogawa Meters & Intruments Model 2793-01 or equivalent
Main Specifications
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 Specifications
Standard temperature stability accuracy: ±0.05°C
For information on purchasing the calibration instruments, contact your nearest
YOKOGAWA dealer.
Calibration Procedure
1. Wire the recorder and the calibration instrument as shown in the following figure,
and adequately warm up the instruments (the warm-up time of the recorder is at
least 30 minutes).
2. Check that the operating environment such as ambient temperature and
humidity is within the normal operating conditions (see section 7.6).
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 is outside the accuracy 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
DC voltage standard
+
–
Input terminals
+–
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