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 of 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 frequency-domain signal conditioning.
Model - Configuration
SR640 - dual low-pass
SR645 - dual high-pass
SR650 - high-pass/low-pass (can be cascaded for Band -pass)