技术参数：

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

Noise

See graphs

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)

Warranty

One year parts and labor on defects in materials and workmanship