Yokogawa Data Acquisition with PID Control CX2000 - Manual (Page 346)

13-2
IM 04L31A01-01E
13.2 Calibration
It is recommended that the CX2000 be calibrated once a year to assure its measurement
accuracy. For details regarding calibration, contact your nearest YOKOGAWA dealer for
details.
Required Instruments
A calibration instrument with an appropriate resolution is required for calibrating the
CX2000.
Recommended Instrument
• DC voltage standard:
YOKOGAWA Model 2552 or equivalent
Main specifications
Accuracy for the range of 20 mV to 20 V: ±0.005%
• Decade resistance box: Yokogawa M&C Model 2793-01 or equivalent
Main specifications
Accuracy for the output range of 0.1 to 500 Ω: (±0.001% + 2 mΩ)
Resolution: 0.001 Ω
For information on purchasing the calibration instruments, contact your nearest
YOKOGAWA dealer.
Calibration Procedure
1. Wire the CX2000 and the calibration instrument as shown in the following figure,
and adequately warm up the instruments (the warm-up time of the CX2000 is at
least 30 minutes).
2. Check that the operating environment such as ambient temperature and
humidity is within the standard operating conditions (see chapter 14).
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
L N
DC voltage standard
Power supply
terminals
Input terminals
+
-
–
+