Yokogawa PC-Based MX100 - Manual (Page 78)

3-6 IM MX100-01E
3.3 Calibration
It is recommended that the MX100 be calibrated once a year to assure its measurement
accuracy. A calibration instrument with an appropriate accuracy and resolution is required
for calibrating the MX100.
Range Calibration of DC Voltage, RTD, Resistance, Strain, and Analog Output
Required Instruments
• DC voltage/current standard
Must meet the following specifications (M/9100 by FLUKE or equivalent)
Output range: 20 mV to 100 V
Accuracy in the output range: ±(0.01% + 1 µV) or less
• Resistance standard
Must meet the following specifications (ADR3204 by Alpha Electronics or equivalent)
Resistance setting range (resolution): 0.2 to 1999 Ω (0.001 Ω), 0.2 to 19999 Ω (0.01 Ω)
Resistance accuracy of the resistance setting range: ±(0.01% of rdg + 2 mΩ) or less
* For calibrating the Universal Input Module and 6-CH Medium-Speed, Four-Wire
Resistance Input module
• Bridge head (Yokogawa Electric model 701955 and 701956)
• Digital multimeter
Must meet the following specifications (7562 by Yokogawa Electric or equivalent)
Accuracy: ±0.01% or less
Calibration Procedure
1. Wire the module being calibrated and the calibration instrument as shown in
the figure below, and adequately warm up the MX100 (the warm-up time of the
MX100 is at least 30 minutes).
2. Check that the operating environment such as ambient temperature and humidity
is within the standard operating conditions (see sections 4.4 through 4.8).
3. Connect the PC and the MX100 so that communication is possible. Start the
Calibrator of the MX100 Standard Software, and then start the calibration.
For the operating procedure of the Calibrator, see the MX100 Standard Software User’s
Manual (IM MX180-01E).
Wiring Diagram
• When calibrating the DC voltage range of the 4-CH, High-Speed Universal Input
module
Hi
Lo
100Vpk MAX TO 250V MAX CH TO CH 600V MAX TO
100Vpk MAX TO 250V MAX CH TO CH 600V MAX TO
When calibrating 0 V When calibrating a range other than 0 V
DC voltage/current standard
Input terminal
+
–
Input terminal
+
–
Short
* Carry out calibration for each input terminal.