SYS-A395R

Overview

• Replicates a programmed waveform of any shape or polarity
• Ideally suited for data acquisition and stimulator generators
• Contains 17 alkaline 9V batteries
• Designed for Neuroscience & Muscle applications

Features

All WPI stimulus isolators are designed to supply constant current because current threshold (not voltage) is the most quantitatively reproducible parameter for stimulation of nerve and muscle. Model A395 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. A visual indicator (the compliance alarm) will display if I x R reaches this limit. Model A395 D can generate a voltage of 70 volts or more across its OUTPUT terminals. Thus, the user can be sure that the amplitude of the current will be as dialed as long as the voltage drop across the load (stimulus electrode path) does not reach the magnitude of the supply voltage. A visual indicator (the compliance LEDs) displays. The user would then know that (a) too much current was dialed for a given load or (b) inter-electrode resistance was too high or the electrode circuit path was open.

Output current

Model 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 mutiple channel requirements.

 

Current Delivery

A 10 V input produces the maximum output current for the current range selected. For example, 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.

Specifications

OUTPUT CURRENT, Imax	3 ranges: 100μA, 1mA, and 10mA
OUTPUT VOLTAGE RANGE	±70V
OUTPUT BANDWIDTH	10 kHz (measured across 1KΩ load R)
INPUT RESISTANCE	> 20MΩ
INPUT VOLTAGE @ Imax	±10V
INPUT/OUTPUT LINEARITY ERROR	< 0.5%
RISE, FALL TIME	26μs @ 10KΩ
POWER:Model A395D	17 alkaline 9V batteries
POWER:Model A395R	17 rechargeable NiMH 9V batteries
DIMENSIONS	6.5 x 4 x 3.5 in. (16 x 10 x 9 cm)
SHIPPING WEIGHT	4 lb. (1.8 kg)

Accessories

Citations

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