Omega RD-MV100 Series, User Manual

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13-3
Maintenance
13
13.3 Calibration
To maintain the measurement accuracy, we recommend the recorder be calibrated
once a year. Calibration service is also provided by Omega. For details contact Omega.
Required Instruments
For calibrating the recorder, calibration instruments with the following resolution are
necessary.
Recommended instruments
• DC voltage standard : Omega Model 2552 or equivalent
Main specifications
Accuracy of output in the range 20 mV to 20 V :
±
0.005%
• Decade resistance box : Omega Model 2793-01 or equivalent
Main specifications
Accuracy of output in the range 0.1 to 500
Ω
:
±
0.001%
Resolution : 0.001
Ω
(To purchase these instruments, contact the supplier of this recorder.)
Calibration Procedure
1. Connect the recorder and the calibration instruments as shown in the following
figure, and allow the instruments to warm-up adequately. (The warm-up time for
the recorder is at least 30 minutes.)
2. Check that the ambient temperature and humidity are within the normal
operating conditions (See chapter 14).
3. Apply input signals corresponding to 0, 50, and 100% of the specified input
range and calculate the errors from the readings.
If the error is not within the accuracy specifications, contact Omega.
Note
For TC input, the temperature of the input terminals must be measured and a voltage
corresponding to the temperature at the reference junction must be added.
DC voltage measurement (example for the RD-MV112)
+
-
DC voltage standard
Input terminals
(DC volt and TC inputs)
+
-