Users manual
ET1260B and ET1260A
6 1/2 Digit Multimeter
50
[1] Pre-heat for 60 minutes, slow AC filter and sine signal input.
[2] Except for ACV 750V, ACI 12A measurement ranges, other measurement ranges can have
20% of over measurement range measurement.
[3] Typical error under 1MHz is 30% of the reading.
[4] AC 750V measurement range is restricted to 100KHz or 8
×
10
7
voltage frequency product.
[5] Relative to standard calibration.
6.3.3 Additional error
Additional low-frequency error (% of the reading) Additional crest factor error (non-sine wave)
Frequency
AC filter
Crest coefficient
Error (% of the reading)
Slow
Mid
Fast
1-2
0.05
10Hz-20Hz
0
0.74
\
2—3
0.15
20Hz-40Hz
0
0.22
\
3—4
0.30
40Hz-100Hz
0
0.06
0.73
4—5
0.40
100Hz-200Hz
0
0.01
0.22
200Hz-1kHz
0
0
0.18
>1kHz
0
0
0
6.4 Frequency and Period Characteristics
Gate time can be set as 1s, 100ms and 10ms or a wider range.
Stability refers that after DC offset voltage changes, the time to reach stable and accurate
measurement result is not longer than 1 second.
Measurement method is that equal precision frequency testing technology and AC coupling input
use AC voltage measurement function.
6.4.1 Uncertainty indicators
Accuracy is expressed by ± (ppm measurement value) [1]
Function
Measurement
range [2]
Frequency
24-hour [3]
(23±1
℃
)
90
days(23±5
℃
)
1
year
(23±5
℃
)
Temperature
coefficient
0°-18°/28-55°
Frequency
period
100 mV-750V[4]
3-5 Hz
500
500
500
20
5-10 Hz
300
300
300
20
10-40 Hz
200
200
200
10
40Hz-300kHz
50
100
100
10
[1] Pre-heat for 60 minutes, and use 1 second of gate time.
[2] Except for 750V measurement ranges, other measurement ranges can have 20% of over
measurement range measurement.
[3] Relative to standard calibration.
[4] Input >100mV. For 10mV-100mV, multiply percentage measurement error by 10.
5kHz
～
10 kHz
0.3 + 0.04
0.3 + 0.04
0.3+ 0.04
0.015 + 0.006
