WPI A395 Linear Stimulus Isolator

• Creates a constant current replica or analog waveforms
• Amplitude of the output current is voltage controlled
• Input voltage from -10V to +10V
• 3 current ranges from 100μA to 10mA
• Built-in test resistors
• Digital display shows current being delivered for non-varying currents of adequate duation
• Output offset adjustment +/-70V compliance range
• Choose batteries: NiMH with Charger (A395RC), Alkaline (SYS-A395D), NiMH (SYS-A395R)

All WPI stimulus isolators are designed to supply constant current because current threshold (not voltage) is the most quantitatively reproducible parameter for stimulation or nerve and muscle. The A395 from WPI dispenses current reproducibly from its Output terminals; the amplitude being determined by the selected current RANGE and the input voltage. Current amplitude is "constant", that is, load resistance independent, provided that the I x R (load) product does not exceed the available battery supply voltage. As a visual indicator (the compliance LED's) display if I x R reaches this limit. When the unit is out of compliance, one of the two LED's (labeled - and +) illuminate, depending in which direction the current is flowing.

Output current
The A395 generates an output current of arbitrary (user-defined) wave shape; DC, AC, pulse and combinations thereof. Battery operated, and photoelectrically-isolated from the input voltage drive, the instrument regenerates output currents which are linearly proportional to the analog voltage waveforms provided by your D/A converter or signal generator. The A395 is ideally suited for data acquisition and stimulator generators. It can be easily daisy-chained for multiple channel requirements.

Current delivery
A 10V input produces the maximum output current for the current range selected, i.e., 100μA, 1mA or 10mA. Front panel controls allow DC current to be generated. Externally applied signals can be superimposed simultaneously (DC offset). Warning lamps indicate open circuit or excessive current conditions.

Digital meter
Measures DC or average output current.

Overload lamps
Indicate when output voltage has reached positive or negative compliance voltage limit.

For further information please contact us or download the datasheet.