Fluke 87 III - Manual (Page 56)

80 Series III
Users Manual
48
Table 17. Frequency Counter Sensitivity and Trigger Levels
Minimum Sensitivity (RMS Sinewave) Approximate Trigger Level
Input Range
1
5 Hz - 20 kHz 0.5 Hz - 200 kHz (DC Voltage Function)
400 mV dc
400 mV dc
4 V
40 V
400 V
1000 V
70 mV (to 400 Hz)
150 mV
0.3 V
3 V
30 V
300 V
70 mV (to 400 Hz)
150 mV
0.7 V
7 V ( ≤ 140 kHz)
70 V (
≤
14.0 kHz)
700 V (
≤
1.4 kHz)
40 mV

1.7 V
4 V
40 V
400 V
Duty Cycle Range Accuracy
0.0 to 99.9% Within
±
(0.05% per kHz + 0.1%) of full scale for a 5 V logic family input on the 4 V dc range.
Within
±
((0.06 x Voltage Range/Input Voltage) x 100%) of full scale for sine wave inputs on ac voltage ranges.
1. Maximum input for specified accuracy = 10X Range or 1000 V.