Input characteristics – Fluke 189 User Manual
Page 96
Model 187 & 189
Users Manual
7-12
Input Characteristics
Function
Input Impedance (Nominal)
Volts, mV
10 M
Ω
, < 100 pF
Common Mode Rejection Ratio
Normal Mode Rejection
DC Volts, mV
>100 dB at dc, 50 Hz or 60 Hz ±0.1%
>90 dB at 50 Hz or 60 Hz
±
0.1%
AC Volts, mV
> 90 dB dc to 60 Hz
Full-Scale Voltage
Open Circuit Test Voltage
To 5 M
Ω
30 M
Ω
+ nS
Ohms
< 5 V
500 mV
3.1 V
Diode Test
< 5 V
3.1000 V
Typical Short-Circuit Current
500
Ω
5 k
Ω
50 k
Ω
500 k
Ω
5 M
Ω
30 M
Ω
Ohms
1 mA
100
µ
A
10
µ
A
1
µ
A
0.1
µ
A
0.1
µ
A
Diode Test
1 mA typical