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4
Characteristics and Specifications
[1]
Specifications are based on 30 minutes warm-up time, NPLC 20 resolution, and calibration temperature 18 °C to 28 °C.
For NPLC 0 and 0.025, add 0.01% of range.
[2]
120% over range on all ranges except 300 VDC. Input protection up to 300 VDC.
[3]
Input protected with externally accessible 2 A, 250 V fast blown fuse.
[4]
Specifications are for 4-wire ohm or 2-wire ohms using null function in AMM software. If without null function in AMM
software, add 0.2 Ω additional error. Input protection up to 300 VDC. Specifications apply for NPLC ≥1.
[5]
Specifications are for the voltage measured at the input terminals only.
[6]
Continuity threshold is fixed at less than 10 Ω.
DC current settling considerations
Switching current from >1 A to lower current measurement may cause an additional error
approximately 0.3% of reading due to self- heating, and will generally dissipate within a
minute.
[1]
AC specifications
Table 4-2 AC accuracy for voltage
Function
[2]
Voltage
100.000 mVrms
250.000 V
[1]
Specifications are based on 30 minutes warm-up time and calibration temperature 18 ° C to 28 ° C. In manual range, the
settling time is 2.6 seconds while in autorange, the first measurement accuracy is <1%.
[2]
Specifications are for sine wave inputs more than 5% of range. 120% over range on all ranges except 250 VAC. Maximum
crest factor of 5 at full scale. Input impedance is 1 MΩ in parallel with capacitance less than 120 pF, AC couple with up to
68
Range
20 ~ 45
1 + 0.1
1.00000 V
1 + 0.1
10.0000 V
1 + 0.1
100.000 V
1 + 0.1
[4]
1 + 0.1
Accuracy input (% of reading + % of range)
Frequency (Hz)
45 ~ 10k
0.2 + 0.1
0.2 + 0.1
0.3 + 0.1
0.3 + 0.1
0.3 + 0.1
10k ~ 30k
30k ~ 100k
1.5 + 0.3
5.0 + 0.3
1.0 + 0.1
3.0 + 0.2
1.0 + 0.1
3.0 + 0.2
1.0 + 0.1
3.0 + 0.2
1.0 + 0.1
3.0 + 0.2
U2741A User's Guide
[3]
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