Stanford Research SR650 Programmable Low Pass / High Pass Filter

Stanford Research MPN: SR650

Sale price$2,395.00 USD
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Stanford Research SR650 Programmable Low Pass / High Pass Filter

The SR650 is a Programmable Low Pass / High Pass Filter. 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.

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.


  • Two independent filter channels
  • 115 dB/octave rolloff
  • 1 Hz to 100 kHz frequency range
  • 0.1 dB passband ripple
  • 6 nV/√Hz input noise
  • Up to 80 dB of gain
  • GPIB and RS-232 interfaces

Please see Datasheet for complete details and specifications.


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