Specifications 7
U1253B User’s and Service Guide 191
Frequency Counter Specifications
Table 7-13 Frequency counter (divide by 1) specifications
Range Resolution Accuracy Sensitivity Minimum input freq.
99.999 Hz 0.001 Hz 0.02% + 3
[1]
100 mVrms
0.5 Hz
999.99 Hz 0.01 Hz
0.002% + 5
< 985 kHz
9.9999 kHz 0.0001 kHz
99.999 kHz 0.001 kHz
999.99 kHz 0.01 kHz 200 mVrsm
Table 7-14 Frequency counter (divide by 100
[4]
) specifications
Range Resolution Accuracy Sensitivity Minimum input freq.
9.9999 MHz 0.0001 MHz
0.002% + 5
< 20 MHz
400 mVrms
1 MHz
99.999 MHz 0.001 MHz 600 mVrms
Notes for frequency counter specifications:
1 All frequency counters are susceptible to error when measuring low-voltage, low-frequency signals. Shielding inputs
from picking up external noise is critical for minimizing measurements errors. For non-square wave signals, an additional
5 counts needs to be added.
2 The maximum measurement level is < 30 V pp.
3 The minimum measurement frequency of low frequency is set by power-on option to speed up the measurement rate.
4 Shown on the secondary display.
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