Fluke 287 Fluke 287 and 289 Multimeter Users Manual - Page 84

Frequency Counter Specifications

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287/289 Users Manual Frequency Counter Specifications Function Range Resolution Accuracy Frequency (0.5 Hz to 999.99 kHz, pulse width >0.5 μs) 99.999 Hz 999.99 Hz 9.9999 kHz 99.999 kHz 0.001 Hz 0.01 Hz 0.0001 Hz 0.001 Hz 0.02 % + 5 0.005 % + 5 0.005 % + 5 0.005 % + 5 [1] Duty Cycle [2][3] Pulse Width [2][3] 999.99 kHz 1.00 % to 99.00 % 0.1000 ms 0.01 Hz 0.01 % 0.0001 ms 0.005 % + 5 0.2 % per kHz + 0.1 % 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 1999.9 ms 0.1 ms 0.002 ms + 3 counts [1] For 64.000 kHz to 67.000 kHz, accuracy = ±5 Hz, at -20 to +55 °C with R.H. 0 % to 90 % (0 °C to 37 °C), 0 % to 65 % (37 °C to 45 °C), 0 % to 45 % (45 °C to 55 °C). [2] For rise times 2 μs. Pulse width range is determined by the frequency of the signal. 74

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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 Hz
0.005 % + 5
99.999 kHz
0.001 Hz
0.005 % + 5
[1]
Frequency
(0.5 Hz to 999.99 kHz, pulse
width >0.5
μ
s)
999.99 kHz
0.01 Hz
0.005 % + 5
Duty Cycle
[2][3]
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
[2][3]
1999.9 ms
0.1 ms
0.002 ms + 3 counts
[1]
For 64.000 kHz to 67.000 kHz, accuracy =
±
5 Hz, at -20 to +55
°
C with R.H. 0 % to 90 % (0
°
C to 37
°
C), 0 % to 65 % (37
°
C to 45
°
C), 0 % to 45 %
(45
°
C to 55
°
C).
[2]
For rise times <1
μ
s. Signals centered around trigger levels.
[3]
0.5 to 200 kHz, pulse width >2
μ
s. Pulse width range is determined by the frequency of the signal.