YOKOGAWA CA150 - 9. Calibration Mode Introduction; (1) Standard Device Selection for Calibration

Calibration Mode
9-1
IM CA150E
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App
9. Calibration Mode
To maintain high accuracy, it is recommended to calibrate the instrument
once a year. This section describes the calibration procedure using
the standard devices recommended in "Standard Device Selection."
(1) Standard Device Selection
Source Function
Function
DCA
DCV
Standard Device Range Accuracy
100 mV
1 V
10 V
30 V
20 mA
20 mA SINK
500 Ω
5 kΩ
50 kΩ
0.002% + 1 µV
0.002% + 5 µV
0.002% + 0.05 mV
0.002% + 1 µV
0.0035% + 0.5 µA
0.0035% + 0.5 µA
0.002% + 0.01 Ω
0.005% + 0.15 Ω
0.01% + 5 Ω
• Digital multimeter
• Digital multimeter
• DC voltage/current
standard
Ω
Measurement Function
Function
DCA
DCV
Standard Device Range Accuracy
500 mV
5 V
35 V
20 mA
100 mA
500 Ω
5 kΩ
50 kΩ
0.002% + 5 µV
0.002% + 50 µV
0.0025% + 0.5 mV
0.0025% + 0.4 µA
0.004% + 3 µA
0.0055% + 7.5 mΩ
0.0055% + 0.75 Ω
0.055% + 1 Ω
• DC voltage/current
standard
Reference resistorΩ
(2) Required Environment and Conditions for Calibration
Ambient temperature: 23 ±1°C
Relative humidity: 45% to 75%
Warm-up time:
The standard devices must be warmed up for the specied times and
the instrument must be warmed up for at least 2 hours (for calibration).