UNI-T UT 61+ Series User Manual page 18

10) AC Current
UT61E+
Range Frequency response
Resolution
220μA 0.01μA
2200μA 0.1μA
1μA
22mA
10μA
220mA
20A 1mA
UT61B+/UT61D+
Range
Resolution
600.0μA 0.1μA
6000μA
60.00mA
600.0mA 0.1mA
6.000A
10.00A (UT61B+)
10mA
20.00A (UT61D+)
10mA
Display: True RMS
Frequency response: 40Hz~500Hz (UT61B+), 40Hz~1kHz (UT61D+),
40Hz~10kHz (UT61E+)
Accuracy guarantee (UT61B+/UT61D+): 5%~100% of 600.0μA range,
1%~100% of other ranges; open circuit allows least significant digit ≤5
Accuracy guarantee (UT61E+): 1%~100% of range at 40Hz~1kHz, 10%~100%
of range at 1kHz~10kHz (the minimum measured current at μA ranges is 30μA);
open circuit allows least significant digit ≤10
The AC crest factor can be ≤3.0 at 3000 counts, and can only be ≤1.5 at
6000 counts. The additional error should be added according to the crest
factor of a non-sinusoidal wave as follows (UT61B+/UT61D+):
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Accuracy
± (0.8%+10)
40Hz~1kHz
± (3%+50)
1kHz~10kHz
± (0.8%+10)
40Hz~1kHz
± (3%+50)
1kHz~10kHz
± (1.2%+10)
40Hz~1kHz
± (3%+50)
1kHz~10kHz
± (1.2%+10)
40Hz~1kHz
± (3%+50)
1kHz~10kHz
40Hz~1kHz ± (1.2%+10)
± (3%+50)
1kHz~10kHz
Accuracy
± (1.2%+5)
1μA
10μA
± (1.5%+5)
1mA
± (2.0%+5)
a) Add 4% when crest factor is 1~2
b) Add 5% when crest factor is 2~2.5
c) Add 7% when crest factor is 2.5~3
The AC crest factor can be ≤2.0 at 10000 counts, and can only be ≤1 at
22000 counts. The additional error should be added according to the crest
factor of a non-sinusoidal wave as follows (UT61E+):
a) Add 4% when crest factor is 1~2
b) Add 5% when crest factor is 2~2.5
c) Add 7% when crest factor is 2.5~3
Frequency measurement range: 40Hz~500Hz (UT61B+), 40Hz~1kHz (UT61D+),
40Hz~10kHz (UT61E+); input amplitude: ≥50% of current range.
Duty ratio is for reference only.
Frequency accuracy: ± (0.1%+4); resolution: 0.1Hz (UT61B+/UT61D+)
Overload protection: Same as that for DC current
11) Frequency/Duty Ratio
UT61E+
Range
Resolution
10Hz~220MHZ 0.01Hz~0.01MHz
0.1%~99.9%
UT61B+/UT61D+
Range Resolution
10.00Hz~10.00MHZ 0.01Hz~0.01MHz
0.1%~99.9%
Frequency input amplitude:
≤100kHz: 200mVrms ≤ input amplitude ≤ 20Vrms
>100kHz~1MHz: 600mVrms ≤ input amplitude ≤ 20Vrms
>1MHz (UT61B+/UT61D+): 1Vrms ≤ input amplitude ≤ 20Vrms
>1MHz~40MHz (UT61E+): 1Vrms ≤ input amplitude ≤ 20Vrms
>40MHz (UT61E+): Not specified
Duty ratio measurement is only applicable to square waves.
1Vpp ≤ input amplitude ≤ 20Vpp
Frequency ≤10kHz, duty ratio: 10.0% ~ 90.0%
Overload protection: 1000V
Accuracy
± (0.01%+5)
± (2%+5)
0.1%
Accuracy
± (0.1%+4)
± (2.0%+5)
0.1%
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