Technical data

122 Agilent U1251B/U1252B User’s and Service Guide
6 Performance Tests and Calibration
[1] The additional error to be added as frequency > 20 kHz and signal input <
10% of range: 300 counts of LSD per kHz.
[2] The accuracy could be 0.05% + 10, always use relative function to zero
thermal effect (short test leads) before measuring the signal.
[3] The accuracy of 500
and 5k is specified after the Null function.
[4] For range of 50 M
/500 M , the RH is specified for < 60%.
[5] The accuracy is specified for < 50nS and after Null function as open test
lead.
[6] All frequency counters are susceptible to error when measuring low voltage,
low-frequency signals. Shielding inputs from external noise pickup is critical for
minimizing measurement errors.
[7] Use the Null mode to zero residual
Step Test Function Range 5520A Output
Error from nominal 1 year
U1251B U1252B
19 Press button to go to
A mode
5 A 5 A, 1 kHz ± 42 mA ± 37 mA
3A 3 A, 5 kHz ± 96 mA ± 96 mA
10 A
[11]
10 A, 1 kHz ± 100 mA ± 90 mA
Square Wave
Output
Use 53131A
20 Turn the rotary switch to the
position
120 Hz @ 50% N/A ± 26 mHz
4800 Hz @ 50% N/A ± 260 mHz
Duty Cycle 100 Hz @ 50% N/A ± 0.398%
[12]
100 Hz @ 25% N/A ± 0.398%
[12]
100 Hz @ 75% N/A ± 0.398%
[12]
Use 34410A
Amplitude 4800 Hz @
99.609%
N/A ± 0.2V