Combines optical isolation with a ±100 mA current generator A385 High Current Stimulus Isolator STIMULATORS, ISOLATORS 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 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. 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. 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. A385RC SYS-A385R SYS-A382 A385R with A382 Charger High Current Isolator, rechargeable Battery Charger for A385 (see below) Specify line voltage A385 SPECIFICATIONS OUTPUT WAVEFORM OUTPUT CURRENT RANGES CURRENT AMPLITUDE ERROR CURRENT RESOLUTION REPEATABILITY OUTPUT LOAD VOLTAGE EXCURSION (COMPLIANCE) EXTERNAL COMMAND VOLTAGE TRIGGER THRESHOLD OUTPUT POLARITY CURRENT RISE TIME AND DELAY CURRENT FALL TIME AND DELAY OUTPUT TO GROUND RESISTANCE OPTOCOUPLER POWER DIMENSIONS SHIPPING WEIGHT DC or current pulse 1, 10, and 100 mA 0.5% of full scale, max 0.1% of full scale, typical 36 V 5.0 V at 3.0 mA (TTL level), 10 V max. 2.0 V at 0.5 mA Reversible, manual switch, or electronically switched bipolar delivery 6 µs, typical (1 KΩ load) 10 µs, typical (1 KΩ load) 1012 Ω 2500 V, rated minimum breakdown voltage Six rechargeable lead-acid batteries (Requires companion charger A382) 8.5 x 3.5 x 5 in. (22 x 9 x 12 cm) 5 lb (2.3 kg) POWER DIMENSIONS SHIPPING WEIGHT A382 Battery Charger An innovative threestep charger, A382 employs fast, medium, and trickle charges at a safe, low current, greatly extending battery life. After a fast initial phase, the charger automatically switches to a constant voltage mode. When charging is complete, the charger switches to the trickle-charge mode. LED lamps indicate charging status. (For use only in charging batteries installed in the A385.) A382 SPECIFICATIONS 95-135 V or 220-240 V, 50/60 Hz 8.5 x 3.5 x 5 in (22 x 9 x 12 cm) 5 lb (2.3 kg) 92 UK: Tel: +44 (0)1462 424700 • wpiuk@wpi-europe.com World Precision Instruments www.wpiinc.com Germany: Tel: +49 (0)30-6188845 • wpide@wpi-europe.com US: Tel: 941-371-1003 • sales@wpiinc.com