7351 Series Digital Multimeter Operation Manual
8.3 Calibration
8-5
8.3
Calibration
To maintain the measurement accuracy of this instrument, perform calibration at least once a year; warranty
period.
8.3.1
Preparing for Calibration
1. Power supply
Use an AC power supply in a voltage range listed in Table 3-4 and frequency of 50 Hz or 60 Hz.
2. Environment
Perform calibration in following conditions.
Temperature: +23
3
C
Humidity:
70% or less
An area free from dust, vibration, wind, and noise
3. Warm-up time
Perform calibration after allowing a warm up time of 60 minutes or more.
Sufficient warm-up time is also required for the instrument used for calibration.
8.3.2
Calibration Standards
Calibration standard
Operation range
Accuracy
DC voltage
190 mV - 1000 V
15 ppm
AC voltage
5 mVrms
1 kHz sinusoidal wave
1400 ppm
10 mVrms - 100 mVrms 1 kHz sinusoidal wave
1000 ppm
100 mVrms - 700 mVrms 1 kHz sinusoidal wave
200 ppm
Resistance
190
50 ppm
1.9 k
- 190 k
20 ppm
1.9 M
50 ppm
19 M
, 100 M
1000 ppm
DC current
190 mA - 1.9 A
150 ppm
10 A
1000 ppm
AC current
1.9 mA - 190 mA
1 kHz sinusoidal wave
500 ppm
1.9 A
1 kHz sinusoidal wave
1000 ppm
10 A
1 kHz sinusoidal wave
1000 ppm
