|
Delivers positive, negative, or bipolar currents
Delivers positive, negative, or bipolar currents. For bipolar delivery, polarity of the output is toggled to the opposite state with each pulse presented to the input. Pulse duration is controlled by an externally applied voltage. Input connector is a standard BNC, allowing signals from any source — such as computer D/A or I/O lines — to be used.
Output amplitude
Output amplitude is set on a 3-digit, ten-turn dial as a percentage of the range selected: for example, a setting of 45.6 in the 0-10 mA range translates to 4.56 mA at the output.
Accurate and repeatable
Accuracy and repeatability are excellent. Designed for subcutaneous stimulation, maximum output voltage at the stimulating electrodes is 36 volts, reducing the possibility of serious accidental transcutaneous shocks. A compliance/output alarm sounds when the 36-volt limit is reached. Internal circuitry maintains electrodes short-circuited during inactive periods (“electrode exhauster” feature). A385 is not appropriate for transcutaneous stimulation.
Battery life
The
1.2 amp-hour rating of the six heavy-duty lead-acid rechargeable batteries
ensures that experiments will not be interrupted by dead batteries —
even at peak currents. Indicator lights and audible alarms keep the user
constantly apprised of battery charge status. These batteries must be
recharged by the A382 System Charger designed especially for the A385.
Specifications
| OUTPUT WAVEFORM | DC or current pulse |
| OUTPUT CURRENT RANGES | 1, 10, and 100mA |
| CURRENT AMPLITUDE ERROR | 0.5% of full scale, max |
| CURRENT RESOLUTION REPEATABILITY | 0.1% of full scale, typical |
| OUTPUT LOAD VOLTAGE EXCURSION (COMPLIANCE) | 36V |
| EXTERNAL COMMAND VOLTAGE: THRESHOLD | 2.2V, min |
| EXTERNAL COMMAND VOLTAGE: OUTPUT POLARITY | Reversible, manual switch, or electronically switched bipolar delivery |
| EXTERNAL COMMAND VOLTAGE: CURRENT RISE TIME AND DELAY | 6μs, typical (1 KOhm load) |
| EXTERNAL COMMAND VOLTAGE: CURRENT FALL TIME AND DELAY | 10μs, typical (1 KΩ load) |
| EXTERNAL COMMAND VOLTAGE: OUTPUT TO GROUND RESISTANCE | 1012Ω |
| EXTERNAL COMMAND VOLTAGE: OPTOCOUPLER | 2500V, rated minimum breakdown voltage |
| POWER | Six rechargeable lead-acid batteries (Requires companion charger A382) |
| DIMENSIONS | 8.5 x 3.5 x 5 in. (22 x 9 x 12 cm) |
| SHIPPING WEIGHT | 5 lb. (2.3 kg) |
