14 | Keysight | U1280 Series Handheld Digital Multimeters - Data Sheet

Duty cycle mode

Range

Accuracy at full scale

DC coupling

99.999%

0.3 % per kHz + 0.3 %

AC coupling

99.999%

0.3 % per kHz + 0.3 %

Pulse width range

Resolution

Accuracy

99.999 ms

0.001 ms

Duty cycle accuracy / frequency + 1

999.99 ms

0.01 ms

Duty cycle accuracy / frequency + 1

2000.0 ms

0.1 ms

Duty cycle accuracy / frequency + 1

Notes

1. The accuracy for duty cycle and pulse width is based a square wave of full scale input to the 6 V

range. For AC coupling, the duty cycle range can be measured within 5 % to 95 % for signal

frequency more than 15 Hz.

2. The pulse width (positive or negative) must be more than 10 µs. The range of the pulse width is

determined by the frequency of the signal.

3. The range of the duty cycle is determined by the frequency of the signal: {10 µs x frequency x 100 %}

to {[1 –(10 µs x frequency)] x 100 %}

Peak hold for U1281A / U1282A

Signal width

Accuracy for DC mV / voltage / current

Single event > 1 ms

2 % + 400 for all ranges

Repetitive > 250 µs

2 % + 1000 for all ranges

dB specification for U1281A / U1282A

dB base

Reference

Default reference

1 mW (dBm)

1 to 9999 Ω

50 Ω

1 V (dBV)

1 V

1 V

Notes

1. The reading of dBm is indicated in decibels of power above or below 1 mW, or decibels of voltage

above or below 1 V. The formula is calculated according to the voltage measurement and specified

reference impedance. Its accuracy is depended on the accuracy of the voltage measurement.

2. Auto-ranging mode is used

3. The bandwidth is according to voltage measurement.