Isostim™Stimulator/Isolator

NEW NiMH Batteries in Rechargeable version Combining the ease of use and accuracy of WPI's 300 Series stimulators with the power output of a stimulus isolator. Timing

Pulse interval and width are set with single-turn continuously variable controls from 5 ms to 5.5 s in three ranges. Pulse width is continuously variable from 50 µs to 550 ms in four ranges.

Modes of operation

In continuous mode, Isostim generates continuous square waves. In gated or external sync modes, externally applied pulses can generate trains or single events. Single pulses of finite duration can be produced using a push-button on the instrument's front panel. External/DC mode converts Isostim to a passive stimulus isolator.

Dual tone audible alarm

A tone sounds when an open circuit is detected or when system compliance is reached. A second tone, which sounds when a signal is applied to the input, can only be heard if the batteries have sufficient charge to operate the isolator. A violation light advises when pulse width exceeds the interval.

Current delivery

Stimulus currents up to 10 mA can be set on the front panel with a control knob and a two-position range switch. Output current is load-independent.

Power

Isostim model A320D is powered by readily obtainable 9-volt alkaline batteries (included). Under average use these will last several months before replacement is required. The rechargeable A320R is supplied with a nickel cadmium battery stack which provides 10-12 hours of operation before recharge is required. The A362 Battery Charger must be used with the A320R.

ISOSTIM™ SPECIFICATIONS

Timing Parameters

Interval

5 ms to 5.5 s continuously variable in three ranges (0.18 to 200 Hz)

Pulse width

50 µs to 550 ms continuously variable in four ranges

Input
External sync

Accepts 1-µs minimum pulses
External gate

Accepts 1-µs pulse to continuous
Ext. command voltage threshold

2.5 V at 3.5 mA min., 8.5 V max.

Output
Waveform

DC, pulse from internal timing or externally generated pulse
Current ranges

1.0 and 10 mA
Load voltage excursion (compliance)

100 V nom., 150 V max.
Output polarity

Reversible, manual switch
Current rise time and delay

8 µs, typical (1 k Ohms load)
Current fall time and delay

10 µs, typical (1 k Ohms load)
Leakage resistance, output to ground

1012 Ohms
Optocoupler

2500 V rated min. breakdown voltage

Power
Dry Cell (Version D)

16 alkaline 9V batteries, included
Rechargeable (Version R)

16 rechargeable NiMH 9V batteries, included

Dimensions

8.5 x 3.5 x 4.9 in (22 x 9 x 12 cm)

Shipping Weight

4 lb (1.8 kg)
Order Numbers
A320RC A320R with Charger (A362)

A320D

Isostim Stimulator/Isolator

A320R

Isostim Stimulator/Isolator (rechargeable)

A362

Battery Charger for A320R, A360R, A365R, A395R

Specify line voltage

Optional Accessories

3468

Dual Rack Mount Kit

3469

Single Rack Mount Kit

DRL

Dummy Load Resistor Kit (0.1 K, 1 k, 10 K)