
AC specifications for U1272A
Function Range Resolution
Accuracy
45 to
65 Hz
20 Hz to 1
kHz
1 kHz to
5 kHz
5 kHz to
20 kHz
20 kHz
to 100
kHz
True RMS AC
Voltage
[1]
30 mV 0.001 mV 0.6 + 20 0.7 + 25 1.0 + 25 1.0 + 40 3.5 + 40
300 mV 0.01 mV 0.6 + 20 0.7 + 25 1.0 + 25 1.0 + 40 3.5 + 40
3 V 0.0001 V 0.6 + 20 1.0 + 25 1.5 + 25 2.0 + 40 3.5 + 40
30 V 0.001 V 0.6 + 20
1.0 + 25 1.5 + 25 2.0 + 40 3.5 + 40
300 V 0.01 V 0.6 + 20 1.0 + 25 1.5 + 25 2.0 + 40 -
1000 V 0.1 V 0.6 + 20 1.0 + 25 1.5 + 25 - -
LPF (low pass fi lter)
enabled, applicable for
all voltage ranges and
resolution
0.6 + 20
1.0 + 25 @
<200 Hz
5.0 + 25 @
<440 Hz
---
Z
LOW
1000 V 2.0 + 40 2 + 40 @
<440 Hz
---
Function Range Resolution
Accuracy
Burden
voltage/
Shunt
45 to
65 Hz
20 Hz
to
2 kHz
True RMS
AC Current
[2]
300 µA 0.01 µA 0.6 + 25 0.9 + 25 <0.04 V/ 100 Ω
3000 µA 0.1 µA 0.6 + 25 0.9 + 25 <0.4 V/ 100 Ω
30 mA 0.001 mA 0.6 + 25 0.9 + 25 <0.08 V/ 1 Ω
300 mA 0.01 mA 0.6 + 25
0.9 + 25 <1.00 V/ 1 Ω
3A 0.0001 A 0.8 + 25 1.0 + 25 <0.1 V/ 0.01 Ω
10 A 0.001 A 0.8 + 25 1.0 + 25 <0.3 V/ 0.01 Ω
1. Notes for voltage specifications
• Overload protection: 1000 Vrms. For millivolt measurements, 1000 Vrms for short circuits with <0.3 A current.
• Input impedance: 10 MΩ (nominal) in parallel with <100 pF.
• Z
LOW
impedance: 2 kΩ (nominal)
• The input signal is lower than the product of 20,000,000 V×Hz.
• For 20 to 100 kHz accuracy: Three counts of the LSD per kHz of additional error is to be added for frequencies >20 kHz and signal inputs <10%
of range.
2. Notes for current specifications
• Overload protection for 300 μA to 300 mA range: 0.44 A/1000 V; 10 × 35 mm 30 kA fast-acting fuse
• Overload protection for 3 A to 10 A range: 11 A/1000 V; 10 × 38 mm 30 kA fast-acting fuse
• Specification for 300 mA range: 440 mA continuous.
• Specification for 10 A range: 10 A continuous. Add 0.3% to the specified accuracy when measuring signals >10 to 20 A for 30 seconds
maximum. After measuring currents >10 A, cool down the multimeter for twice the duration of the measured time before proceeding with low
current measurements.
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