The Constant Voltage Stimulator - Unipolar Pulse (STM200) can be used to stimulate any preparation or subject, including
pain and stress studies that require lower voltages and wider pulse widths
trigger the stimulator from a visual presentation system such as SuperLab®, E-Prime®, DirectRT®, MediaLab®, Inquisit®, and other visual presentation programs
tissue baths (range 0-100 V at 0.1-200 ms pulse width)
nerve or muscle stimulation that requires higher energy than a STMISOC/D/E can deliver
Controls & Connections
Front Panel
Range
Establishes the stimulus pulse output level range in Volts (0-10 Volts or 0-100 Volts).
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Turn right to select a range of 0-10 Volts.
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Turn left to select a range of 0-100 Volts.
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Remove the key for added safety and control.
If the Range is changed before recording begins, the scaling must also be changed (MP menu > Set Up Channels) to maintain direct Level recordings.
If the Range is changed during recording, the user should manually enter a software marker to note the change (F9 on Windows or Esc on Mac). The pulse Level could then be determined by (mentally) moving the decimal place to the right or left, depending on how the Range was changed.
Reference
Refers to the pulse width of the signal on the Reference Output (on the back panel).
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Actual reflects the actual output width.
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Fixed (15 ms) establishes a pulse width of 15 ms, regardless of the actual pulse width.
The Reference control only affects the pulse width; in either case, the pulse level reflects the actual output level.
Level
Level is used in conjunction with Range to set the stimulus pulse output level. Turn the Level control (right to increase, left to decrease) to establish the desired Level, as indicated on the digital display.
Output
Standard BNC connector to output the stimulus pulse to external electrodes or other devices.
LCD light
The red LCD is activated when the DC adapter is plugged in and the power switch on the back panel is turned ON, and flashes when the stimulus pulse is active.
Back Panel
Power
Rocker switch for turning the STM200 power ON and OFF.
Fuse
If the fuse blows and must be replaced, use a screwdriver to open (counterclockwise) and close (clockwise) the fuse cap.
DC Input
Socket for DC adapter (AC100A).
Trigger
This cable terminates in a 3.5 mm mono plug for connection to the UIM100C Analog Output 0 or the STM100C 50 ohm output.
Manual Test
Used to diagnose problems with the STM200 stimulator unit. When the Trigger and Reference Output cables are disconnected, press the Manual Test button to initiate a stimulus with a fixed pulse width of 2.5 milliseconds.
Reference Out
This output cable terminates in an RJ-11 plug for connection to the HLT100C. The cable reports the stimulator marker pulse to the MP System, via the channel it is connected to. A marker pulse will be generated each time the stimulator generates a pulse. The front panel Reference switch determines the marker amplitude:
Applications
Virtual Reality
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