Input and filters menu, Input and filters – SRS Labs SR850 User Manual

Page 117

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INPUT AND FILTERS MENU

Float

Grounding

Current Gain

Source

A

A-B

I

Ground

1M

100M

Line Notches

Out

Line

2xLine

Both

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 M

, 25 pF input impedance. Their connec-

tor shields are isolated from the chassis by either 10

(Ground) or

10 k

(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 k

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.

5-7

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