If the photograph is clicked, it grows.

SR570 Specifications Input Inputs Virtual null or user-set bias (±5 V) Input offset ±1 pA to ±1 mA adjustable DC offset current Maximum input ±5 mA Sensitivity 1 pA/V to 1 mA/V in 1-2-5 sequence (vernier adj. in 0.5 % steps) Frequency response ±0.5 dB to 1 MHz. Adjustable front-panel frequency response compensation for source capacitance. Grounding Amplifier ground is fully floating. Amplifier and chassis ground are available at rear panel. Input ground can float up to ±40 V. Filters Signal filters 2 configurable (low-pass or high-pass) 6 dB/oct rolloff filters. -3 dB points are settable in a 1-3-10 sequence from 0.03 Hz to 1 MHz. Gain allocation Low noise Gain is allocated to the front end for best noise performance. High bandwidth Front-end gain is reduced for optimum frequency response. Low drift Low bias current amplifier is used for reduced drift at high sensitivity. Filter reset Long time constant filters may be reset with front-panel button. Output Gain accuracy ±0.5 % of output + 10 mV (25 °C) DC drift See table below Maximum output ±5 V into a high impedance load General External blanking TTL input sets gain to zero External toggle TTL input inverts gain polarity Rear panel biasing ±12 VDC @ 200 mA, referenced to amplifier ground Computer interface RS-232, 9600 baud, receive only Power 100/120/220/240 VAC, 6 watts charged, 30 watts while charging. Internal batteries provide 15 hours of operation between charges. Batteries are charged while connected to the line. Dimensions 8.3" × 3.5" × 13.0" (WHL) Weight 15 lbs. (batteries installed)