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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 or S88 stimulators for applications
which require more output power than the S48 and S88 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 ³10 Hz, ³1 Hz, or ³0.5 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.
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