S-900 Stimulator (CORNERSTONE Series)


The Dagan S-900 Stimulator single channel stimulator was designed for precise timing control of electronic events in the research laboratory. Interval and duration control of a single event or of train sequences has been built into the S-900. All the functions you need are built into a single unit without the necessity of expensive add-on cards or modules. When combined with a Dagan S-900 series isolator you will have everything you need for direct stimulation of physiological preparations in a compact and reliable package.


The S-900 features ten turn analog input controls for convenient and precise control of timing parameters. Unlike a conventional analog stimulator the accuracy and repeatability of functions has been maintained through the use of digital circuits for all timing. As a result, the S-900 does not suffer from temperature instability and drift problems associated with multiple analog timers that use capacitors for timing. Settings are precise, accurate and repeatable.


The S-900 can be used to create pulses as long as 100 seconds at up to 1000 seconds intervals. Pulse trains up 1000 seconds long are also possible. The S-900 can also be used in conjunction with a second S-900 or any other timing device for an unlimited number of timing routines. The S-900 has the capability to expand along with the expanding complexity of your research.

S-900 Specifications..............

All internally generated time functions are continuously variable in six switchable ranges. Ten turn calibrated dials set the value within each range with. 2% resolution.

  • Pulse Interval - 100 microseconds to 1000 seconds.
  • Pulse Width - 10 microseconds to 100 seconds.
  • Train Duration - 100 microseconds to 1000 seconds
  • Train Pulse Interval - 10 microseconds to 100 seconds.

Trigger Input - TTL and CMOS compatible edge sensitive interval control.

Gate Input - TTL and CMOS compatible positive or negative state sensitive

Timing Outputs

Monitor output - TTL and CMOS compatible output active during pulse.

SYNC - 50 microseconds TTL and CMOS compatible. (Shorter or longer sync pulse widths user selectable)

Analog Outputs

Continuous or pulsed

Variable amplitude positive and negative polarity Two ranges - 0-1 Volt, 0-10 volt

RISE TIME - 3.5 microseconds

NOISE - less than 100 microvolts RMS in 30 kHz bandwidth (8 pole Bessel filter) at 10 volt output range.

RESOLUTION -.2% of full scale value Output impedance - < 1 ohm

Isolator output - Current source, characteristics tailored for use 'with Dagan S-910 stimulus isolation unit.

Error Lights

LED indicates when the S-900 is unable to produce timing functions as set with the controls.

For instance, if the pulse width is set for a longer time than the interval between pulses, the pulse width error LED will light indicating this function cannot be accomplished. The S-900 will continue to operate but the outputs will not accurately reflect the control inputs under these circumstances.


120 or 240 VAC switch selectable. Power consumption is 9 watts. Semi-toroidal transformer and steel cabinet covers are used to eliminate electromagnetic fields and prevent interference from other lab equipment.


19 inch wide rack mountable cabinet (rack mounting hardware supplied) 3.5 inches high by 10 inches deep. BNC connectors supplied on all input and output connections

S-910 Stimulus Isolation Unit


The S-910 was designed as a full function, small footprint, affordable, analog input analog output stimulus isolation unit for use with the S-900 stimulator. The S-910 allows remote amplitude control of isolated stimulus signals from the front panel of the S-900. This battery-powered device is photo isolated and capable of producing current and voltage stimulation. A single BNC connector is all that is needed to connect the S-900 and S-910 for each set-up and operation.



With ten turn dials for timing controls with resolution of better than 1%.



With one turn dials for timing controls with resolution of better than 5%.



100v/10mA Stimulus Isolation unit



Adapter to convert S-910 to every other pulse Biphasic.


Download the Manual (PDF)

 Other Stimulators: S-940/S-910 (computer driven SIU)

Warning: This equipment is not intended for use in human applications or human experimentation.

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Dagan Corporation Minneapolis MN USA  Email: info@dagan.com 2/13