| 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 |
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