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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)
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)