{"product_id":"stanford-research-sr640","title":"Stanford Research SR640 Programmable Two-Channel Low Pass Filter","description":"\u003cp\u003e\u003cstrong\u003eStanford Research SR640 Programmable Two-Channel Low Pass Filter\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe SR640 is a Dual-Channel Programmable Low Pass Filter. Each instrument channel has a low-noise preamplifier, two precision low-pass filter sections, and an output amplifier. The filter is an 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 SR640 ideal for applications including anti-aliasing, audio analysis, and general frequency-domain signal conditioning.\u003c\/p\u003e\n\u003cp\u003eEach 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.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFeatures:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eTwo independent filter channels\u003c\/li\u003e\n\u003cli\u003e115 dB\/octave rolloff\u003c\/li\u003e\n\u003cli\u003e1 Hz to 100 kHz frequency range\u003c\/li\u003e\n\u003cli\u003e0.1 dB passband ripple\u003c\/li\u003e\n\u003cli\u003e6 nV\/√Hz input noise\u003c\/li\u003e\n\u003cli\u003eUp to 80 dB of gain\u003c\/li\u003e\n\u003cli\u003eGPIB and RS-232 interfaces\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003ePlease see Datasheet for complete details and specifications.\u003c\/p\u003e","brand":"Stanford Research","offers":[{"title":"S.R.S. SR640 Low Pass Filter","offer_id":52537739182423,"sku":"SRSSR640","price":2395.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0955\/9389\/0135\/files\/SRSSR640.jpg?v=1768380692","url":"https:\/\/www.tsdwelltest.com\/products\/stanford-research-sr640","provider":"TSD Welltest Solution","version":"1.0","type":"link"}