Datasheet

Page 6
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U1252B/U1253B AC current specifications
Function Range Resolution Accuracy ± (% of reading + no. of least significant digit)
Frequency
20 Hz ~ 45 Hz 45 Hz ~ 1 Khz 1 Khz ~ 20 Khz
6
20 Khz~100 Khz
6 8
True RMS AC
current
2, 7
500.00 µA
3
0.01 µA 1.0+20 0.7+20 0.75+20 5.0+80
5000.0 µA 0.1 µA
50.000 mA 0.001 mA
440.00 mA 0.01 mA 1.5+20
5.0000 A 0.0001 A 1.5+20
5
3+60, <3 A/5 kHz N/A
10.000 A
4
0.001 A
1. Input impedance: Refer to Table A on page 10.
2. ACV measurement is AC coupled; while ACmV and AC μA/mA/A measurement are DC coupled. All specifications are valid from 5% to 100% of range.
3. Input current >35 µARMS.
4. Current can be measured from 2.5 A up to 10 A continuously. An additional 0.5% needs to be added to the specified accuracy if the signal measured is in
the range of 10 A ~ 20 A for 30 seconds maximum. After measuring a current of >10 A, leave the meter to cool down for twice the measuring time used
before application of low current measurement.
5. Input current < 3 ARMS.
6. These specifications are for typical performance.
7. Crest factor ≤ 5 at half-scale, ≤ 3 at full-scale, and decrease reciprocally for overange as 3 * Full Scale / Input; except for 1000 mV and 1000 V ranges,
where this ranges have crest factor ≤ 3 at half-scale, ≤ 1.5 at full scale, and decrease reciprocally for overange as 1.5 * Full Scale / Input. For non-sinusoidal
waveform, add 0.1 % of reading ± 0.3 % of range.
8. Additional error to be added for frequency > 15 kHz and signal input < 10 % of range: 3 counts of LSD per kHz.
9. 2% over-range on all ranges except AC 1000 V range.
10. The maximum displayable counts is 51000, except for 1000.0 mV, 1000.0 V and 10 A ranges, where the maximum displayable counts is 15000. “0.L” will
be shown for any resultant AC+DC voltage/current that exceeds the maximum displayable counts in manual range. Subject to operate within the product
specifications.
U1252B/U1253B AC+DC voltage specifications
Function Range Resolution Accuracy ± (% of reading + no. of least significant digit)
Frequency
30 Hz ~ 45 Hz 45 Hz ~ 1 kHz 1 kHz ~ 5 kHz 5 kHz ~ 15 kHz 15 kHz~100 kHz
8
True RMS AC
voltage
1, 2, 10
50.000 mv 0.001 mv 1.5+80 0.4+60 0.7+60 0.8+60 3.5+220
500.00 mV 0.01 mV 1.5+65 0.4+30 0.4+30 0.8+45 3.5+125
1000.0 mV 0.1 mV
5.0000 V 0.0001 V 0.6+30 1.5+45
50.000 V 0.001 V 0.4+30
500.00 V 0.01 V N/A N/A
1000.00 V 0.1 V 0.4+45 0.4+45 N/A N/A
U1252B/U1253B AC+DC current specifications
Function Range Resolution Accuracy ± (% of reading + no. of least significant digit)
Frequency
30 Hz ~ 45 Hz 45 Hz ~ 1 kHz
6
1 kHz ~ 20 kHz
6
True RMS AC
current
10
500.00 µA
3
0.01 µA 1.1+25 0.8+25 0.8+25
5000.0 µA 0.1 µA
50.000 mA 0.001 mA 1.2+25 0.9+25 0.9+25
440.00 mA 0.01 mA
5.0000 A 0.0001 A 1.8+30
5
0.9+30 3.3+70, <3 A/5 kHz
10.000 A
4
0.001 A 0.9+25