Stanford Research SR570 Low Noise Current Preamplifier
SOLD OUT　sold		 amp251











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)