Stimu-Splitter and Stimulus Attenuator
SS2 AND SS2-MC STIMU-SPLITTER II

The Stimu-Splitter II is a versatile, compact stimulus power booster with built-in switching and precision monitoring capabilities. It is a perfect complement to the Grass S48, S88 or S88X stimulators for applications which require more output power than the S48, S88 and S88X can provide. It is ideal for multiple tissue bath applications, which may utilize plate or ring electrodes submersed in a saline bath. This offers a very low impedance to the stimulator and requires relatively high values of stimulus current.

The Stimu-Splitter power booster is the ideal solution to stimulator overload problems, providing ample current to drive up to eight low resistance electrode arrays. The Stimu-Splitter allows quick determination of both peak stimulus voltages and current.

Optional 0.1 Hz Metering Capability
The amplifiers inside the Stimu-Splitter II do not limit how low a stimulation pulse frequency can be used. However, the digital peak voltage/current meter stores the highest amplitude (peak) it sees over a moving window of time. If an equivalent or higher pulse is seen, the window moves. If an equivalent or higher pulse is not seen within this moving window of time, the meter resets and looks for a new (usually lower) amplitude to display. The rate of detection of such a lower amplitude and the subsequent display update can ideally be as fast as the stimulation pulse rate. When high pulse rates are used, the detection and display of a lower amplitude can be very fast, and at slow pulse rates the response time to lowering the amplitude will (necessarily) be slow.

To allow the user to optimize the response time of the digital peak meter for their specific stimulation frequency, the Stimu-Splitter has a 3-position Stimulus Frequency selector switch on the front panel with positions for ≥10 Hz, ≥1 Hz, or ≥0.5 Hz. The researcher should set this switch to the fastest setting corresponding to the stimulus frequency.

However, for researchers who need to stimulate all the way down to 0.1 Hz, Model SS2-MC changes the lowest setting of this switch to handle frequencies to 0.1 Hz. This changes the meter response (to a lowering of the pulse amplitude) to 10 seconds. A 10-second response time can be disconcerting if the researcher is stimulating at 0.5 Hz and would like a response in 2 seconds. Therefore, this option should be ordered only if the researcher intends to stimulate at frequencies below the standard 0.5 Hz setting.

SPECIFICATIONS
Peak Meter
Range   +24 volt mode: 0 to +24 volts, 0 to 999 mA
+12 volt mode: 0 to +12 volts, 0 to 600 mA
Resolution   0.1 volt, 1 mA
Accuracy   ±1% or ±0.1 volt*, ±1% or ±1 mA*
*Whichever value is greater (percentage is of displayed reading). Frequency of recurring peak must be ≥0.5 Hz (or ≥0.1 Hz with SS2-MC), and the peak amplitude must be ≥0.1 msec in duration.
Signal Characteristics
Pulsed
Waveforms
  Frequency: 0.5 Hz to 5 kHz, or 0.1 Hz to 5 kHz (with SS2-MC)
Duration: 0.1 msec to 1 sec
Duty Cycle: 0.005% to 50%, Duty Cycle = Duration x Frequency x 100%
Amplitude: 0 to +24 volts (+24 volt mode), -12 volts to +12 volts (±12 volt mode)
Non-pulsed
Waveforms
  Virtually any shape waveform can be boosted by the Stimu-Splitter II
Output
Output Voltage
Range
  0 to +24 volts, or -12 volts to +12 volts
Peak Output Current   1 Ampere each output
Maximum Power
Out
  24 watts each output
Output
Impedance
  0.2 ohms
Protection
Output Protection   All outputs are overload and short circuit protected
Input Protection   All inputs are overvoltage protected to ±150 volts
Line Input
Voltage   Rear panel selectable, 100 volts to 127 volts, or 208 volts to 250 volts
Current   1 Ampere at 120 volts, 0.6 Ampere at 240 volts,
Line Cord   Specify destination country on the order for proper line voltage selection, fuse and local country IEC line cord
Physical Size
Physical Size   10" W x 4.5" H x 8" D
(25.4 cm x 10.2 cm x 20.3 cm)
Weight   9 lbs. (4.08 kg)


SS2 Stimu-Splitter II

FEATURES
8 High Power Outputs
  providing ample current to stimulate 8 submersed tissues in almost any stimulation application
8 Individual Output Switches
  allowing individual tissue stimulation at the flip of a switch
8 Sensitive Output Pulse Monitors
  providing clear visual indication of even the slightest tissue stimulation on any channel
Digital Peak Current Meter
  for easy, accurate measurement of individual tissue stimulation currents
Digital Peak Voltage Meter
  for easy, accurate measurement of individual tissue stimulation voltages
+24 Volts and ±12 Volt Output Ranges
  allowing either monophasic or biphasic stimulation signals to be boosted and measured
Multiple Signal Capability
  allows up to 4 stimulators with completely different stimulation signals to be boosted and measured using a single Stimu-Splitter II unit
Auxiliary Monitor Output
  allows switch selectable viewing of output channels using any auxiliary monitor (e.g., oscilloscope) without patching and reconnecting probes or cables
Voltage Level Adjustment (using optional SA1 accessory)
  provides individual voltage level adjustment for each output pair
ORDERING INFORMATION
Model SS2
 
Stimu-Splitter II Stimulator Power Booster including manual (specify destination country on the order for proper line voltage selection, fuse and local country IEC line cord)
Model SS2-SA
 
Adaptor and cable for connection to Grass Stimulators, (BNC to UHF) 3-foot (0.9 m) cable
Model SS2-MC   0.1 Hz Metering capability for SS2
   
Stimulator Attenuator accessory for SS2, including 4, 1.5-foot (0.45 m) output cables