Yokogawa µR20000 - Manual (Page 222)

IM 04P02B01-01E
11-4
11.4 Calbratng 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.
Requred Instruments
A calibration instrument with appropriate resolution is required for calibrating the recorder.
Recommended Instrument
• DC voltage standard: Model 9100 by FLUKE or equivalent
Man Specfcatons
Output accuracy: ±(0.005% + 1 µV)
• Decade resistance box: Yokogawa Meters & Instruments Model 2793-01 or equivalent
Man Specfcatons
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
Man Specfcatons
Standard temperature stability accuracy: ±0.05°C
For information on purchasing the calibration instruments, contact your nearest
YOKOGAWA dealer.
Calbraton 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 12.6).
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 YOKOGA-
WA 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 terminal
L
N
µR20000
+/A –/B