User's Manual

Specifications 8
Agilent U1251A/U1252A User’s and Service Guide 157
Frequency Specifications
Duty Cycle and Pulse Width Specifications
Table 7-10 Frequency specifications
Range Resolution
Accuracy
± (% of reading + No. of
Least Significant Digit)
Min. Input Frequency
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 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%
Notes for duty cycle specifications:
1 The accuracy for duty cycle and pulse width is based on a 5 V square wave input into the DC 5 V range.
2 For AC coupling, the duty cycle range can be measured for signal frequency > 20 Hz.
Pulse width
- 500 ms 0.01 ms 0.2% + 3
- 2000 ms 0.1 ms 0.2% + 3
Notes for pulse width specifications:
1 The accuracy for duty cycle and pulse width is based on a 5 V square wave input into the DC 5 V range.
2 Positive or negative pulse width must be greater than 10 µs and the range of duty cycle should be considered. The range
of pulse width is determined by the frequency of the signal.