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Table 6-2
Performance verification tests (continued)
Step
Test function
amplitude
Notes for performance verification tests:
[a] The additional error to be added for frequency > 20 kHz and signal input < 10% of range: 300 counts of LSD per kHz.
[b] An accuracy of 0.05% + 10 can be achieved by using the relative function to zero the 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 the range of 50 M500 M, the relative humidity is specified for < 60%.
[e] The accuracy is specified for < 50 nS, with the Null function performed on open test leads.
[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 function to offset for residuals.
[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 the relative function to zero the thermal effect with open test leads before measuring the signal. If you do not use the relative
function, add 20 digits to the error.
[j]
10 A continuous, and additional 0.5% error to specified accuracy when measuring a signal greater than 10 A to 20 A for 30 seconds
maximum. After measuring a current of > 10 A, cool down the multimeter for twice the measuring time you applied before performing a low
current measurement.
[k] The current can be measured from 2.5 A to 10 A continuous, with an additional 0.5% error to specified accuracy when measuring a signal
greater than 10 A to 20 A for 30 seconds maximum. After measuring a current of > 10 A, cool down the multimeter for twice the measuring
time you applied before performing a low current measurement.
[l]
For signal frequencies greater than 1 kHz, an additional 0.1% error per kHz needs to be added to the accuracy.
[m] Ensure that the ambient temperature is stable within ± 1 ºC. Make sure the multimeter is placed in a controlled environment for at least
1 hour. Keep the multimeter away from any ventilation exit.
[n] With a 2-wire connection and compensation enabled at calibrator.
Keysight U1253B User's and Service Guide
Performance Tests and Calibration
Reference signals/
Range
values
Measure with
34410A
4800 Hz @
99.609%
6
Error limits
± 0.2 V
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