6 Performance Tests and Calibration
160 Keysight U1251B and U1252B User’s and Service Guide
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.
19
Press button to go to
A mode
5 A 5 A, 1 kHz ± 42 mA ± 37 mA
10 A
[k]
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%
[l]
100 Hz @ 25% N/A
± 0.398%
[l]
100 Hz @ 75% N/A
± 0.398%
[l]
Use 34410A
Amplitude
4800 Hz @
99.609%
N/A ± 0.2V
Table 6-2 Verification Test (continued)
Step Test Function Range 5520A Output
Error from nominal 1 year
U1251B U1252B
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