Filter
Top Products
INPUT AND FILTERS MENU
Float
Grounding
Current Gain
Source
A A-B
I
Ground
1M 100M
Line Notches
Out Line
2xLineBoth
Coupling
AC DC
Grounding
Source
Current Gain
INPUT
FILTERS
A A-B I
Line Notch Filters
Coupling
Input and Filters The Input and Filters menu sets the input signal source and configura-
tion. The input notch filters are also selected in this menu. See the
SR850 Basics section for a discussion of the different input configura-
tions and the signal filters.
Source The Input Source key selects the front end signal input configuration. The
input amplifier can be either a single-ended (A) or differential (A-B) volt-
age or a current (I).
The voltage inputs have a 10 MΩ, 25 pF input impedance. Their connec-
tor shields are isolated from the chassis by either 10 Ω (Ground) or
10 kΩ (Float). Do not apply more than 50 V to either input. The shields
should never exceed 1 V.
The current input uses the A connector. The input is 1 kΩ to a virtual
ground. The largest allowable DC current before overload is 10 µA (1 M
gain) or 100 nA (100 M gain). No current larger than 10 mA should ever
be applied to this input.
Current Gain This key selects the current gain when using the current input as the
signal source. This menu box is only available if the current input is
selected above.
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