188 U1253B User’s and Service Guide
7 Specifications
Frequency Specifications
Duty Cycle and Pulse Width Specifications
Table 7-8 Frequency specifications
Range Resolution Accuracy Minimum Input Frequency
[1]
99.999 Hz 0.001 Hz 0.02% + 3
[2]
1 Hz
999.99 Hz 0.01 Hz
0.02% + 3
< 600 kHz
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 For non-square wave signals, an additional 5 counts need to be added.
3 The multimeter will automatically select the most appropriate range when making frequency measurements.
Table 7-9 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.
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