U1281A Datasheet, PDF (15/18 Pages) Keysight Technologies – U1280 Series Handheld Digital Multimeters

15 | Keysight | U1280 Series Handheld Digital Multimeters - Data Sheet
Frequency counter specification for U1282A³
Division
1
100
Range
99.999 Hz
999.99 Hz
9.9999 kHz
99.999 kHz
999.99 kHz
9.9999 MHz
9.9999 MHz
99.999 MHz
Resolution
0.001 Hz
0.01 Hz
0.0001 kHz
0.001 kHz
0.01 kHz
0.0001 MHz
0.0001 MHz
0.001 MHz
Accuracy
0.02 % + 5²
0.002 % + 5
0.002 % + 5
0.002 % + 5
0.002 % + 5
0.002 % + 5, < 1 MHz
0.002 % + 5, < 20 MHz
Sensitivity¹
30 mV
30 mV
30 mV
30 mV
200 mV
200 mV
330 mV
Notes
1. The sensitivity is specified as input with a load of 50 Ω.
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.
For non-square wave signal, add additional 5 counts.
3. The maximum measurement level is ± 1.8 Vp.
Minimum input frequency
0.5 Hz
1 MHz
Square wave output specification¹ for U1282A^2,3
Output
Duty cycle¹
Pulse width¹
Amplitude
Range
0.5, 1, 2, 5, 6, 10,15, 20, 25, 30, 40, 50, 60, 75, 80 Hz
100, 120, 150, 200, 240, 300, 400, 480, 600, 800 Hz
1200, 1600, 2400, 4800 Hz
0.390 % to 99.609 %
1 / frequency
Fixed + 2.2 V
Resolution
0.01 Hz
0.1 Hz
1 Hz
0.390625 %
Range / 256
0.1 V
Notes:
1. The specification is typical performance.
2. The positive or negative pulse width must be greater than 2 µs for adjustment of the duty cycle or
pulse width under different frequencies. Otherwise, the accuracy and range will be different from the
specification defined.
3. Output impedance: 600 Ω (nominal)
Multimeter data refresh rate
Function
ACV (V or mV)
DCV (V or mV)
Ω
Diode
Capacitance
DC µA, mA or A
AC µA, mA or A
Temperature
Frequency
Duty cycle
Pulse width
Slow (times/second)
5
5
5
5
1 (< 100 µF)
5
5
5
1 (> 10 Hz)
1 (> 10 Hz)
1 (> 10 Hz)
Fast (times/second)
40
40
40
40
—
40
40
40
—
—
—
Accuracy
0.005 % + 2
0.4 % at full scale
Range / 256 + 2 µs
0.2 V