Fluke 289 - Frequency Counter Specifications

287/289
Users Manual
74
Frequency Counter Specifications
Function Range Resolution Accuracy
99.999 Hz 0.001 Hz 0.02 % + 5
999.99 Hz 0.01 Hz 0.005 % + 5
9.9999 kHz 0.0001 kHz 0.005 % + 5
99.999 kHz 0.001 kHz 0.005 % + 5
Frequency
(0.5 Hz to 999.99 kHz, pulse
width >0.5 μs)
999.99 kHz 0.01 kHz 0.005 % + 5
Duty Cycle
[1][2]
1.00 % to 99.00 % 0.01 % 0.2 % per kHz + 0.1 %
0.1000 ms 0.0001 ms 0.002 ms + 3 counts
1.000 ms 0.001 ms 0.002 ms + 3 counts
10.00 ms 0.01 ms 0.002 ms + 3 counts
Pulse Width
[1][2]
1999.9 ms 0.1 ms 0.002 ms + 3 counts
[1] For rise times <1 μs. Signals centered around trigger levels.
[2] 0.5 to 200 kHz, pulse width >2 μs. Pulse width range is determined by the frequency of the signal.