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1.
I am trying to decide whether I need to use the DS7A or DS7AH, do
you have any advice?
The
maximum output of the DS7A is 100mA while that of the DS7AH is 1A
(with reduced output widths). We find that for the majority
of applications, the DS7A is perfectly suitable, however, the main
exception is where the human quadriceps muscle is being directly
stimulated. In this particular case, we would recommend the
higher output of the DS7AH.
2.
I want to produce trains of electrical stimuli and the DS7A does
not include a frequency generator, does Digitimer have a simple
device which could be used for this purpose?
Of
course we do. Digitimer manufactured several devices
suitable for this. Certain configurations of the NeuroLog
system can be used to generate quite complex trigger pulse
protocols compatible with the trigger input of the DS7A/AH.
However, our battery powered DG2
Trigger Generator complements the DS7A/AH by providing a
continuous burst of trigger pulses with control over frequency.
3.
I want to stimulate using pulses of alternating polarity, is this
possible with the DS7A?
The
current production versions of the DS7A/AH stimulators do NOT have
the facility to alternate the polarity of the pulses in a burst,
however, this feature can be added as a custom modification
(M288A) if
required. With the modification, the unit can produce +ve
going, -ve going or alternating polarity through the use of a
three position toggle switch.
4. What
sort of output plugs do I need in order to connect electrodes to
the DS7A stimulator?
The
DS7A and DS7AH are not supplied with output plugs, however we do
provide them as optional accessories. The part code for a
pair (one red, one black) is D185-OC1.
5.
Does Digitimer supply a range of electrodes for use with
their stimulators?
Digitimer does now offer a range of
Neurodiagnostic accessories to be used with our
stimulators and amplifiers. We appreciate that we cannot
include all types of electrode, so If you experience difficulty
obtaining electrodes of the correct specifications, we would be
glad to help.
6.
I am planning to trigger a DS7A using a computer DA
interface. What are the requirements for the trigger pulse? The
DS7A/AH triggers on the +ve edge of a standard TTL compatible
logic pulse (+3V to +15V) of at least 5µs duration.
7.
I have one of your DS7A stimulators, but the pulse duration
control knob doesn't turn to the 0.5-2ms settings, should I return
it for repair? The
higher output DS7AH has a limiting feature that for safety reasons
prevents use of these wider pulse durations. Although your
stimulator has DS7A on the front panel, please check the serial
number label on the back of the unit, as I think you will find it
indicates that it is a DS7AH.
8.
Is it possible to use two DS7A stimulators in parallel to
stimulate a subject with a pair of different pulse types through
the same set of electrodes?
Yes,
it is possible to do this and the method has been summarized in an
application
note.
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