U1272A Datasheet, PDF (16/22 Pages) Keysight Technologies – U1270 Series Handheld Digital Multimeters

16 | Keysight | U1270 Series Handheld Digital Multimeters - Data Sheet
Electrical Specifications
Frequency specifications^{1, 2}
Range
99.999 Hz
999.99 Hz
9.9999 kHz
99.999 kHz
999.99 kHz
> 1 MHz
Resolution
0.001 Hz
0.01 Hz
0.1 Hz
1 Hz
0.01 kHz
0.1 kHz
Accuracy ± (% of reading +
counts of least significant digit)
0.02 + 5
0.005 + 5
0.005 + 5
0.005 + 5
0.005 + 5
0.005 + 5 @ < 1 MHz
Minimum input frequency
0.5 Hz
1.  Overload protection: 1000 V; input signal is < 20,000,000 V × Hz (product of voltage and frequency).
2.  The frequency measurement is susceptible to error when measuring low-voltage, low-frequency signals. Shielding inputs from external noise pickup is criti-
cal for minimizing measurement errors. Turning on the low pass filter may help you to filter out the noise and achieve a stable reading.
Duty Cycle³
Mode
DC coupling
AC coupling
Range
99.99%
99.99%
Accuracy at full scale
0.3 % per kHz + 0.3 %
0.3 % per kHz + 0.3 %
3.  Notes for duty cycle specifications:
- The accuracy for duty cycle and pulse width measurements is based on a 3 V square wave input to the DC 3 V range. For AC couplings, the duty cycle
range can be measured within the range of 10% to 90% for signal frequencies > 20 Hz.
- The range of the duty cycle is determined by the frequency of the signal: {10 μs × frequency × 100%} to {[1 – (10 μs × frequency)] × 100%}.
- The pulse width (positive or negative) must be > 10 μs. The range of the pulse width is determined by the frequency of the signal.
Pulse Width⁴
Range
999.99 ms
2000.0 ms
Resolution
0.01 ms
0.1 ms
Accuracy at full scale
(duty cycle accuracy/frequency) + 0.01 ms
(duty cycle accuracy/frequency) + 0.1 ms
4.  Notes for pulse width specifications:
- The accuracy for duty cycle and pulse width measurements is based on a 3 V square wave input to the DC 3 V range.
- The pulse width (positive or negative) must be > 10 μs. The range of the pulse width is determined by the frequency of the signal.