Keysight U1251B Guia Del Usuario página 162

6 Performance Tests and Calibration
Table 6-2 Verification Test (continued)
Step Test Function
19
Press
A mode
20 Turn the rotary switch to the
position
Duty Cycle
Amplitude
Notes for verification test:
[a] The additional error to be added as frequency > 20 kHz and signal input < 10% of range: 300 counts of LSD per kHz.
[b] The accuracy could be 0.05% + 10, always use relative function to zero thermal effect (short test leads) before measuring the signal.
[c] The accuracy of 500  and 5 k is specified after the Null function.
[d] For range of 50 M/ 500 M, the RH is specified for < 60%.
[e] The accuracy is specified for < 50 nS and after Null function as open test lead.
[f] 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.
[g] Use the Null mode to zero residual.
[h] Set both calibrator and multimeter to internal reference.
To perform the measurement, connect the K-type thermocouple extension (with miniature thermocouple connector on both ends) between
the calibrator's TC output and multimeter via a TC-to-banana adapter.
Allow at least 1 hour for the multimeter to stabilize before measurements are taken.
The error limit does not include the error contributed by the thermocouple extension. To eliminate the thermocouple error, compensation of
the calibrator output through a reference thermometer is recommended.
[i] Always use relative function to zero the thermal effect with open test lead before measuring the signal. If you do not use Relation function, add
20 digits for accuracy purposes.
160
Range
5 A
button to go to
[k]
10 A
Square Wave
Output
120 Hz @ 50%
4800 Hz @ 50%
100 Hz @ 50%
100 Hz @ 25%
100 Hz @ 75%
4800 Hz @
99.609%
5520A Output
5 A, 1 kHz
10 A, 1 kHz
Use 53131A
Use 34410A
Keysight U1251B and U1252B User's and Service Guide
Error from nominal 1 year
U1251B U1252B
± 42 mA ± 37 mA
± 100 mA ± 90 mA
N/A ± 26 mHz
N/A ± 260 mHz
N/A
± 0.398%
N/A
± 0.398%
N/A
± 0.398%
N/A ± 0.2V
[l]
[l]
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