Specifications 7
U1253B User’s and Service Guide 187
Peak hold (capturing changes)
Square wave output
[1]
Output impedance: 3.5 kΩ maximum.
[2]
The positive or negative pulse width must be greater than 50 μs for adjusting
the duty cycle or pulse width under different frequencies. Otherwise, the
accuracy and range will differ from the definition.
[3]
For signal frequency greater than 1 kHz, an additional 0.1% per kHz is added to
the accuracy.
[4]
The accuracy for duty cycle and pulse width is based on a 5 V square wave input
without dividing signal.
Table 7- 1 5 Peak hold specification
Signal width Accuracy for DC mV/V/current
Single event > 1 ms 2%+400 for all ranges
Repetitive > 250 μs 2%+1000 for all ranges
Table 7- 1 6 Square wave output specifications
Output
[1]
Range Resolution Accuracy
Frequency
0.5, 1, 2, 5, 6, 10, 15,
20, 25, 30, 40, 50, 60,
75, 80, 100, 120, 150,
200, 240, 300, 400,
480, 600, 800, 1200,
1600, 2400, 4800 Hz
0.01 Hz 0.005%+2
Duty cycle
[2][4]
0.39% to 99.60% 0.390625% 0.4% of full scale
[3]
Pulse width
[2][4]
1/Frequency Range/256 0.2 ms + (range/256)
Amplitude Fixed: 0 to +2.8 V 0.1 V 0.2 V
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