| 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 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 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.
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) |
|
