160 Agilent U1251A/U1252A User’s and Service Guide
8 Specifications
Frequency Counter Specifications for U1252A
Table 7-15 Frequency counter (divide by 1) specifications
Range Resolution
Accuracy
± (% of reading + No.
of Least Significant
Digit)
Sensitivity Min. Input Frequency
99.999 Hz 0.001 Hz 0.02% + 3
[1]
100 mV R.M.S.
0.5 Hz
999.99 Hz 0.01 Hz
0.002% + 5
< 985 kHz
9.9999 kHz 0.0001 kHz
99.999 kHz 0.001 kHz
999.99 kHz 0.01 kHz 200 mV R.M.S.
9.9999 MHz 0.0001 MHz
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
