Specifications 7
Agilent U1251B/U1252B User’s and Service Guide 163
Frequency Specifications
Duty Cycle and Pulse Width Specifications
Notes for temperature specifications:
1 Accuracy of specifications is subject to the following conditions:
• The accuracy does not include the tolerance of the thermocouple probe. The thermal sensor plugged into the meter
should be placed in the operating environment for at least an hour.
• Use the Null function to reduce the thermal effect. Before using the Null function, set the meter to no ambient
compensation ( ) mode and keep the thermocouple probe as close to the meter as possible, avoiding contact with
any surface that has a different temperature from the ambient temperature.
• When measuring temperature with respect to any temperature calibrator, try to set both the calibrator and the meter
with an external reference (without internal ambient compensation). If both the calibrator and the meter are set with
internal reference (with internal ambient compensation), deviation may show between the readings of the calibrator
and the meter, due to differences in ambient compensation between the calibrator and the meter.
2 This thermocouple type is only available for the U1252B.
Tab l e 7-9 Temperature specifications
Table 7-10 Frequency specifications
Range Resolution
Accuracy
± (% of reading + Number of
Least Significant Digit)
Min. Input Frequency
[1]
99.999 Hz 0.001 Hz
0.02% + 3
<600 kHz
1 Hz
999.99 Hz 0.01 Hz
9.9999 kHz 0.0001 kHz
99.999 kHz 0.001 kHz
999.99 kHz 0.01 kHz
Notes for frequency specifications
1 The input signal is lower than the product of 20000000V ×Hz (product of voltage & frequency); overload protection: 1000 V.
2 The multimeter will automatically select the most appropriate range when making frequency measurements.
Table 7-11 Duty cycle and pulse width specifications
Function Mode Range Resolution Accuracy (at full scale)
Duty cycle
DC Coupling 0.01% to 99.99% - 0.3% per kHz + 0.3%
AC Coupling 5% to 95% - 0.3% per kHz + 0.3%
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