Fluke 287 Fluke 287 and 289 Multimeter Users Manual - Page 87

Input Characteristics, Typical Short Circuit Current

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True-rms Digital Multimeters Detailed Specifications Input Characteristics Function L Overload Protection [1] Input Impedance Common Mode Rejection Ratio (1 kΩ unbalance) 1000 V 10 MΩ 120 dB at dc, 50 Hz or 60 Hz mF V 1000 V [2] 10 MΩ 120 dB at dc, 50 Hz or 60 Hz K 1000 V 10 MΩ 60 dB, dc to 60 Hz L Function 1000 V Overload Protection [1] 3.2 kΩ 5 or 50 nS 550 mV 60 dB at 50 Hz or 60 Hz Not specified Typical Short Circuit Current 5 kΩ 50 kΩ 500 kΩ 5 MΩ 100 μA 10 μA 1 μA 0.3 μA 10 mA 1 mA 50 MΩ 0.3 μA 77

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True-rms Digital Multimeters
Detailed Specifications
77
Input Characteristics
Function
Overload
Protection
[1]
Input Impedance
Common Mode
Rejection Ratio
(1 k
Ω
unbalance)
Normal Mode Rejection
L
1000 V
10 M
Ω
<100 pF
>120 dB at dc, 50 Hz or 60 Hz
>60 dB at 50 Hz or 60 Hz
F
mV
1000 V
[2]
10 M
Ω
<100 pF
>120 dB at dc, 50 Hz or 60 Hz
>60 dB at 50 Hz or 60 Hz
K
1000 V
10 M
Ω
<100 pF
(ac-coupled)
>60 dB, dc to 60 Hz
L
1000 V
3.2 k
Ω
<100 pF
(ac-coupled)
Not specified
Not specified
Full Scale Voltage
Typical Short Circuit Current
Function
Overload
Protection
[1]
Open Circuit
Test Voltage
To 500 k
Ω
>5 or 50 nS
500
Ω
5 k
Ω
50 k
Ω
500 k
Ω
5 M
Ω
50 M
Ω
e
1000 V
[2]
5 V dc
550 mV
<5 V
1 mA
100
μ
A
10
μ
A
1
μ
A
0.3
μ
A
0.3
μ
A
50
e
1000 V
[2]
20 V decreasing
to 2.5 V
500 mV
10 mA
G
1000 V
[2]
5 V dc
3.1 V dc
1 mA
[1]
Input is limited to the product of a V rms sinewave times frequency of 2 x 10
7
V-Hz.
[2]
For circuits <0.5 A short circuit. 660V for high energy circuits.