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In FREE RUN, Isostim™ generates continuous square waves. In EXT?GATE or EXT 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. EXT/DC mode converts Isostim to a passive stimulus isolator.
Dual Tone Audible AlarmA 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 DeliveryStimulus 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.
PowerIsostim
model A320D is powered by readily obtainable 9-volt alkaline batteries
(included). Under average use these will last several months before
replacement is required.
Specifications
| TIMING PARAMETERS | |
| Interval | 5ms to 5.5s continuously variable in three ranges (0.18 to 200Hz) |
| Pulse | width 50μs to 550ms continuously variable in four ranges |
| INPUT | |
| External sync | Accepts 1μs minimum pulses |
| External gate | Accepts 1μs pulse to continuous |
| Ext. command voltage threshold | 2.5V at 3.5mA min., 8.5V max. |
| OUTPUT | |
| Waveform | DC, pulse from internal timing or externally generated pulse |
| Current ranges | 0-1mA, 0-10mA |
| Load voltage excursion (compliance) | 10 V nom., 150V max. |
| Output polarity | Reversible, manual switch |
| Current rise time and delay | 8μs, typical (1KΩ load) |
| Current fall time and delay | 10μs, typical (1KΩ load) |
| Leakage resistance, output to ground | 1012Ω |
| Optocoupler | 2500V rated min. breakdown voltage |
| POWER | |
| Dry Cell (Version D) | 16 alkaline 9V batteries included |
| Rechargeable (Version R) | 16 rechargeable NiMH 9V batteries incl |
| DIMENSIONS | 8.5 x 3.5 x 4.9 in. (22 x 9 x 12 cm) |
| SHIPPING WEIGHT | 4 lb. (1.8 kg) |
