Calibrating The Dx - YOKOGAWA Daqstation DX2000 User Manual

12.2 Calibrating the DX
Required Instruments
Calibration Procedure
12-2
It is recommended that the DX 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.
Calibration instruments with the following resolution are required for calibrating the DX.
Recommended Instruments
• DC voltage standard:
• Decade resistance box:
• 0°C standard temperature device:
For information on purchasing the calibration instruments, contact your nearest
YOKOGAWA dealer.
1.
Wire the DX and the calibration instrument as shown in the following figure, and
adequately warm up the instruments (the warm-up time of the DX 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 DX2010)
Input terminal
+
–
Fluke 9100 or equivalent
Main specifications
Output accuracy: ±(0.005% + 1 µV)
Yokogawa Meters & Instruments Model 2793-01
or equivalent
Main specifications
Accuracy of output range 0.1 to 500 Ω: ±(0.01%
+2 mΩ)
Resolution: 0.001 Ω
ZC-114/ZA-10 by Coper Electronics or equivalent
Main specifications
Standard temperature stability accuracy: ±0.05°C
DC voltage standard
+
–
IM 04L42B01-01E