| 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 |
|
Sensitivity
(A/V) | Bandwidth
(-3 dB)* | Noise/√Hz** | Temp. coefficient
±(%input + offset)/°C | DC Input
Impedance | | | | | | | | | | | High BW | Low Noise | High BW | Low Noise | Low Drift (11 to 28 °C) | All Modes | | 10-3 | 1.0 MHz | 1.0 MHz | 150 pA | 150 pA | 0.01 % + 20 nA | 1 Ω | | 10-4 | 1.0 MHz | 500 kHz | 100 pA | 60 pA | 0.01 % + 2 nA | 1 Ω | | 10-5 | 800 kHz | 200 kHz | 60 pA | 2 pA | 0.01 % + 200 pA | 100 Ω | | 10-6 | 200 kHz | 20 kHz | 2 pA | 600 fA | 0.01 % + 20 pA | 100 Ω | | 10-7 | 20 kHz | 2 kHz | 600 fA | 100 fA | 0.01 % + 2 pA | 10 kΩ | | 10-8 | 2 kHz | 200 Hz | 100 fA | 60 fA | 0.01 % + 400 fA | 10 kΩ | | 10-9 | 200 Hz | 15 Hz | 60 fA | 10 fA | 0.025 % + 40 fA | 1 MΩ | | 10-10 | 100 Hz | 10 Hz | 10 fA | 5 fA | 0.025 % + 20 fA | 1 MΩ | | 10-11 | 20 Hz | 10 Hz | 10 fA | 5 fA | 0.040 % + 20 fA | 1 MΩ | | 10-12 | 10 Hz | 10 Hz | 5 fA | 5 fA | 0.040 % + 20 fA | 1 MΩ | | | | | | | | | * Frequency Compensation adjusted for flat frequency response
** Average noise in the frequency range below the 3 dB point but above the frequency where 1/f noise is significant |
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