User`s guide

Characteristics and Specifications 5
Electrical Specifications
U1273A/U1273AX User’s Guide 141
AC specifications
Table 5- 5 True RMS AC voltage specifications
Function Range Resolution
Accuracy
45 Hz to
65 Hz
20 Hz to
45 Hz
[6]
1 kHz to
5 kHz
5 kHz to
20 kHz
20 kHz to
100 kHz
[5]
65 Hz to
1 kHz
Voltage
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 filter)
enabled, applicable for all
voltage ranges and
resolution
0.6% + 20
1.0% + 25
@ <200 Hz
5.0% + 25
@ <440 Hz
---
Z
LOW
(low input impedance)
enabled, applicable for
1000 V range and resolution
only
[4]
2% + 40
2% + 40
@ <440 Hz
---
Notes for AC voltage specifications:
1 Overload protection: 1000 V
RMS (for millivolt measurements, 1000 VRMS for short circuits with <0.3 A current)
2 Input impedance: 10 MΩ (nominal) in parallel with <100 pF
3 The input signal is lower than the product of 20,000,000 V×Hz.
4 Z
LOW
impedance: 2 kΩ (nominal). For Z
LOW
measurements, autoranging is disabled and the multimeter’s range is set to
1000 V in the manual ranging mode.
5 For 20 kHz 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.
6 U1273AX only: For all AC voltage ranges, the accuracy is specified at 2.5% + 25 counts when measuring at below –20 °C
for 20 Hz to 45 Hz AC signals.