Specifications 7
Agilent U1251B/U1252B User’s and Service Guide 167
Square Wave Output for U1252B
Table 7-16 Frequency counter (divide by 100
[4]
) specifications
Range Resolution
Accuracy
± (% of reading + No.
of Least Significant
Digit)
Sensitivity Min. Input Frequency
9.9999 MHz 0.0001 MHz 0.002 % + 5,
< 20 MHz
400 mV R.M.S.
1 MHz
99.99 MHz 0.001 MHz 600 mV R.M.S.
Notes for frequency counter specifications:
1 All frequency counters are susceptible to error when measuring low-voltage, low-frequency signals. Shielding inputs from
picking up external noise is critical for minimizing measurement errors. For non-square wave signals, an additional 5
counts need to be added.
2 The maximum measurement level is < 30 Vpp.
3 The minimum measurement frequency of low frequency is set by power-on option to speed up the measurement rate.
4 Shown on the secondary display.
Table 7-17 Square wave output specifications
Output
[1]
Range Accuracy
Frequency
0.5, 1, 2, 5, 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
0.005% x output frequency + 2 counts
Duty Cycle
[2][4][5]
0.39% – 99.60% ± 0.398% of full scale
[3]
Pulse Width
[2][4][6]
1/Frequency 0.2 ms + (range/256)
Amplitude Fixed 0 to + 2.8 V ± 0.2 V
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