11-2 IM 04L20A01-01E
11.2 Calibration
It is recommended that the FX100 be calibrated once a year to assure its measurement
accuracy. For details regarding calibration, contact your nearest YOKOGAWA dealer.
Required Instruments
A calibration instrument with an appropriate resolution is required for calibrating the
FX100.
Recommended Instrument
• DC voltage standard: FLUKE Model 5520 or equivalent
Main specifications
Output Accuracy: ±(0.005 %+1 µV)
• Decade resistance box: Yokogawa M&C Model 2793-01 or equivalent
Main specifications
Accuracy for the output range of 0.1 to 500 Ω: ±(0.01 %+2 mΩ)
Resolution: 0.001 Ω
•0 °C standard temperature device: Model ZC-114/ZA-10 from Coper Electronics Co.,
Ltd. or equivalent
Main specifications
Accuracy of stability of the standard temperature: ±0.05 °C
For information on purchasing the calibration instruments, contact your nearest
YOKOGAWA dealer.
Calibration Procedure
1. Wire the FX100 and the calibration instrument as shown in the following figure,
and adequately warm up the instruments (the warm-up time of the FX100 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 12).
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
+
−
b
A
B
Measurement input terminals
+
−
DC voltage standard
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