DS2A mark II

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Constant voltage stimulator

Accurate and reproducible stimulus characteristics.
Switchable polarity, variable output and duration ranges (20µs to 2s).
External pulse duration control through the BNC trigger input.
A single-shot button, which operates irrespective of trigger inputs.
Case manufactured from insulating material.
Power provided by standard batteries. Note that current is only drawn during pulse delivery.

Output:	Two ranges provide 99V (high) and 9V (low) maximum output. A multi-turn dial allows output to be selected as a percentage of maximum. Square wave pulse profile with typical rise time <1µs and fall time <3µs into resistive load.
Pulse Duration:	Range: 20µs to 2s. One dial allows continuous adjustment from 2 to 20, while another is used to select the range (from 10µs, 100µs, 1ms, 10ms, 100ms or external source). Internal pulse duration values have ± 10% accuracy.
Output Terminals:	A pair of 2mm touch-proof sockets on the front panel spaced at 0.75".
Polarity Switch:	Normal: Red output terminal positive. Reverse: Red output terminal negative.
Indicator:	An LED operates for the duration of each output pulse.
Overload:	An automatic overload circuit prevents excessive output current being drawn by reducing the output pulse duration to <10µs when a current of greater than 50mA is detected.
Single Shot:	A single-shot push button is provided. This operates at all times irrespective of trigger input.
Trigger:	A positive pulse of between 3V and 20V is required to trigger the stimulator. The trigger input current varies from 6mA to 62mA over the above voltage range. Trigger pulse duration should not normally be less than 4µs.
Trigger Isolation:	Optical coupling is employed between the trigger source and the stimulator circuitry. The capacity coupling is less than 3pF.
Batteries:	11 x PP3, IEC-6R61 style batteries. Current is only drawn when delivering a pulse. Note that battery test sockets are built-in.
Dimensions:	Panel size: 190mm x 110mm. Depth: 80mm over knobs.
Weight:	800g complete with batteries.

DS3 • DS2A mark II

Cortech Solutions

Updated: 01-Nov-2008

Note that our products are not designed for medical use in diagnosis or treatment of disease. We sell scientific equipment to research scientists working in a variety of fields, but we do not offer any products for, nor do we intend for any of our research products to be used for, diagnosis or treatment of disease. Contact us with questions or comments about this web site.