SR640 Programmable Filters0 pages

Programmable Filters
SR640, SR645, and SR650 — High-pass and low-pass elliptical filters (2-channel)

SR600 Series Programmable Filters
· Two independent filter channels
· 115 dB/octave rolloff
· 1 Hz to 100 kHz frequency range
· 0.1 dB passband ripple
· 80 dB stopband attenuation
· 6 nV/√Hz input noise

The SR600 series consists of three dual-channel instruments.
Each instrument channel has a low-noise preamplifier, a
precision high-pass or low-pass filter section, and an output
amplifier. The filters are 8-pole, 6-zero elliptic-type with
115 dB per octave rolloff, 0.1 dB of passband ripple, and
80 dB stopband attenuation. Cutoff frequencies can be set
between 1 Hz and 100 kHz, making the SR600 series ideal
for applications including anti-aliasing, audio analysis, and
general frequency-domain signal conditioning.
Model — Configuration

· Up to 80 dB of gain

SR640 — dual low-pass
SR645 — dual high-pass
SR650 — high-pass/low-pass (can be cascaded for band-pass)

· GPIB and RS-232 interfaces

Inputs and Preamplifiers

· SR600 series... $3295 (U.S. list)

Stanford Research Systemstt
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Each filter channel has a floating, differential input with 1 MΩ
input impedance and 6 nV/√Hz of input noise. The analog
ground for each filter channel is available at a rear-panel BNC
connector to provide complete flexibility in grounding. The
filter grounds may be tied to the instrument’s chassis ground
or to any other point. Both AC and DC input coupling can
be selected, and an invert key allows the phase of the signal
to be shifted by 180° with a single key press. Up to 60 dB of
preamplifier gain can be specified in 10 dB increments. A
simple offset adjust screw lets you null DC components in
your signal.

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