Frequency Counter Sensitivity; Min Max, Recording, And Peak Specifications; Input Characteristics - Fluke 287 Calibration Manual

Frequency Counter Sensitivity

Approximate Voltage Sensitivity
(rms sine wave)
Input Range
15 Hz to 100 kHz
50 mV
500 mV
5 V
50 V
500 V
1000 V
Approximate Current Sensitivity
(rms sine wave)
Input Range
15 Hz to 10 kHz
500 A
5000 A
50 mA
400 mA
5 A
10 A
[1] Maximum input = 10 x range (1000 V maximum, 2 x 10
affect accuracy.
[2] Typical frequency bandwidth with full scale (or maximum 2 x 10

MIN MAX, Recording, and Peak Specifications

Function
200 ms to 80% (dc function)
MIN MAX, Recording
350 ms to 80 % (ac function)
Peak
250 S (peak)
Crest Factor 350 ms to 80 %
[1] For repetitive peaks; 2.5 ms for single events. Peak not specified for 500 µA DC, 50 mA DC, 5 A DC.
[2] 200 counts in 500 mV AC, 500 A AC, 50 mA AC, 5 A AC.
[3] 3 % in 500 mV AC, 500 A AC, 50 mA AC, 5 A AC.

Input Characteristics

Overload
Function Input Impedance
[1]
Protection
1000 V 10 M <100 pF
L
F
[2]
1000 V 10 M <100 pF
mV
10 M <100 pF
1000 V
K
(ac-coupled)
3.2 k <100 pF
L
1000 V
(ac-coupled)
Open Circuit
Overload
Function
[1]
Test Voltage
Protection
[2]
1000 V 5 V dc
e
20 V decreasing
[2]
50e 1000 V
to 2.5 V
[2]
1000 V 5 V dc
G
[1] Input is limited to the product of a V rms sinewave times frequency of 2 x 10
[2] For circuits <0.5 A short circuit. 660V for high energy circuits.
[1]
AC Bandwidth
5 mV
25 mV
0.25 V
2.5 V
25 V
50 V
AC Bandwidth
25 A
250 A
2.5 mA
25 mA
0.25 A
1.0 A
7
V-Hz product maximum). Noise at low frequencies and amplitudes may
Nominal Response
Specified accuracy ±12 counts for changes >425 ms in
duration in manual range.
Specified Accuracy ±40 counts for changes >1.5 s in duration
in manual range.
Specified accuracy ±100 counts
[1]
range) reading. For higher peak reading (to 12,000 counts),
specified accuracy ±2 %
For periodic waveforms from 50 to 440 Hz ± (4 % + 1 count).
Common Mode
Rejection Ratio
(1 k unbalance)
>120 dB at dc,
50 Hz or 60 Hz
>120 dB at dc,
50 Hz or 60 Hz
>60 dB, dc to 60 Hz
Not specified
Full Scale Voltage
>5 or 50 nS
To 500 k
550 mV
500 mV
3.1 V dc
Approximate DC
[2]
Trigger Levels
1 MHz 5 mV & 20 mV
1 MHz 20 mV & 60 mV
700 kHz 1.4 V & 2.0 V
1 MHz 0.5 V & 6.5 V
300 kHz 5 V & 40 V
300 kHz 5 V & 100 V
Approximate DC
Trigger Levels
100 kHz
100 kHz
100 kHz
NA
100 kHz
100 kHz
100 kHz
7
V-Hz product) rms sine wave.
Accuracy
[3]
of reading.
Normal Mode Rejection
>60 dB at 50 Hz or 60 Hz
>60 dB at 50 Hz or 60 Hz
Typical Short Circuit Current
500 5 k
<5 V 1 mA
100 A
7
V-Hz.
True-rms Digital Multimeters
Detailed Specifications
[2]
DC Bandwidth
600 kHz
1 MHz
80 kHz
1 MHz
300 kHz
300 kHz
DC Bandwidth
NA
[2]
up to 5,000 count (full
Not specified
50 k 500 k 5 M
10 A
1 A 0.3 A
10 mA
1 mA
50 M
0.3 A
9