SI-90V Stimulus Isolator

SI-90V Stimulus Isolator

The model SI-90V Stimulus Isolator has been optimized for applications requiring precise control of rectangular waveform stimuli. It is designed for use with external timing circuits, such as monophasic single channel (e. g. Microprobes for Life Science BPG-1P) or other monophasic pulse signal sources such as computers). The external timing input gates the optically isolated, independently battery powered, constant current source.

The model SI-90V features high compliance, high isolation, and a conveniently portable plastic case. The output circuitry has been optimized for gated on-off operation rather than proportional input following. This mode of operation is inherently very low noise and eliminates the danger of applying DC currents as a result of low level offsets in the control signal between output pulses. It also permits manual fine tuning of the output level from the unit itself which can be placed near the preparation. If you need non-rectangular waveforms (e. g. sinusoids, ramps or computer D/A driving), we recommend the BSI-1A, a linear biphasic stimulus isolator with a complete range of both constant current and constant voltage output levels.

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Constant Current Source


90 Volts Compliance


Multi-Range 10-Turn Amplitude Controls

Item Description
Constant Current 1uA to 10 mA
Current Control Ranges Off, 1, 10, 100 and 1000 uA per turn via 5 position rotary
Output Controls 10 turn potentiometer with indicating dial each channel
Output Linearity 1% all ranges
Compliance Voltage 90 Volts, independent batter sources
Isolation 2,500 VDC (optically isolated)

0.3 pF

Output Connections 2 banana binding posts
Input Connections Floating BNC Jacks
Input Signal ±2.6V min., TTL compatible, protected to ±15V.
Power Supply 2: 9 Volt lithium batteries ULTRALIFE # U9VL.

2: 45 Volt alkaline batteries type NEDA 213

Battery Life 350 hours minimum (9 Volt batteries)
Package Bench mount with supporting handle, 2.6"H x 6.5"W x 7.5"D (less handle)
Weight <2Ib. (shipped with batteries installed)


SI-90V Stimulus Isolator
Download Owners Manual

File name: SI-90V Stimulus Isolator.pdf



All Microprobes for Life Science' products are warranted against defects in materials and workmanship for one full year from the date of delivery. Products that prove to be defective during the warranty period will be repaired or replaced without charge pro-vided they are returned to the factory. No other warranty is expressed or implied. We are not liable for consequential damages.