U1270 Datasheet, PDF (13/19 Pages) Agilent(Hewlett-Packard) – Agilent U1270 Series Handheld Digital Multimeters

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
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 critical for minimizing measurement errors. Turning on the low pass filter may help
you to filter out the noise and achieve a stable reading.
Duty Cycle ^[3]
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 %
Pulse Width ^[4]
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
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.
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.
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