Frequency Counter Sensitivity; Burden Voltage (A, Ma, Μa) - Fluke 87 Series IV User Manual

Frequency Counter Sensitivity

Input Range
50 mV (dB only)
500 mV
3000 mV
5 V
50 V
500 V
1000 V
1. Maximum input for specified accuracy = 10 x Range or 1000 V, ac-coupled only. Accuracy: add 1 count.
2. Sensitivity improves linearly from 40 Hz to 20 kHz.
3. Useable at reduced sensitivity to 0.5 Hz and 1000 kHz.
Burden Voltage (A, mA, µA)
Function
mA - A
A
Minimum Sensitivity (RMS Sine Wave)
2
40 Hz to 20 kHz 15 to 40 Hz
15 mV to 3 mV 15 mV
50 mV to 30 mV 50 mV
1500 mV to 300 mV 2000 mV
1.5 V to 0.3 V 2 V
15 V to 3 V 15 V
50 V to 20 V 50 V
250 V to 100 V 250 V
Range
500.00 A
5,000 A
50.000 mA
400.00 mA
5.0000 A
10.000 A
Frequency Counter Sensitivity
1
Approximate Trigger Levels
3 3
20 to 500 kHz
15 mV
30 mV
2000 mV
2.2 V
5 V
50 V
50 V
Burden Voltage (typical)
102 V / A
102 V / A
1.8 mV / mA
1.8 mV / mA
0.04 V / A
0.04 V / A
Specifications
(DC Voltage Function)
25 mV
35 mV 6 mV
170 mV 6 mV
1.7 V 0.25 V
3.5 V 2.5 V
35 V 25 V
35 V 25 V
7-11
7