Fluke 12B/18 - Input Impedance and Protection

English
Page 15
Function Overload
Protection
1
Input Impedance (Nominal)
f
600V rms
>5 MΩ <100 pF
Automatic Selection and LoZ = >2 kΩ
<200 pF (ac coupled)
2
E
600V rms
>10MΩ <100 pF
Automatic Selection and LoZ = >2 kΩ
<200 pF
2
Common Mode
Rejection Ratio
(1 kΩ
Unbalanced)
Normal Mode
Rejection
f
600V rms
>60 dB at dc 50
or 60 Hz
E
600V rms
>100 dB at dc,
50 or 60 Hz
>50 dB at 50 Hz or 60
Hz
Open Circuit
Test Voltage
Full Scale Voltage
To 4.0 MΩ 40 MΩ
J
600V rms
<1.5V dc <450 mV
dc
<1.5V dc
L
600V rms
2.4-3.0V dc 2.400V dc
Short Circuit Current
J
600V rms <500 µA
L
600V rms 0.95 mA (typical)
1. 3 x 10
6
V Hz maximum
2. ≅2 kΩ input impedance up to 50V. Impedance increases with input
voltage to >300 kΩ at 600V.
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