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1.
I
am having difficulty deciding what modules I will need to carry
out my multi-channel stimulation experiments, do you have any
advice?
Of
course, feel free to contact us to discuss your requirements, but
perhaps you should take a look at our comprehensive D330
operating mode notes and module
selection flowchart before doing so.
2.
I
want to stimulate a set of organ baths, how many can I stimulate
using the D330 system?
A
single D337 rack supports 2 -10 channels of stimulation. In
addition, multiple D337 racks can be linked by a "sync"
cable allowing this maximum to be increased further. Please
remember that for safety reasons any empty bays must have blanking
panels fitted to protect the user from possible electric shock.
3.
I
want to make up some electrode leads to connect to a MultiStim.
What size are the plugs and where can I get them?
The
output sockets on the MultiStim fit 2mm plugs. We can supply
these in packs of 10 with either black or red insulation (part
number NL822P/10-Blk or
NL822P/10-Red).
4.
I
want to use my computer & data acquisition interface to
provide the timing controls for the stimulation output pulses -
How can I do this?
This
is the simplest possible MultiStim setup. If your software
and hardware is capable of producing the required stimulation
timing characteristics (i.e pulse frequency and duration), then
all you require is a D337 Case,
D334B Sync
Module, the required
number of dual stimulator modules/blanking panels and an appropriate cable
(usually Lemo plug to BNC plug) to link the interface to the
MultiStim. We also recommend a D335 meter in order to easily
monitor the output current.
5.
I
have re-arranged my dual stimulator modules in the case and now
the stimulators display a lit error LED on the front panel?
The
D337 Case is specifically designed to hold timing and pulse
generator modules in the first (left-hand) four bays. Dual
width stimulator modules (D333H or
D343) will ONLY operate
correctly if they are placed in the remaining 10 bays.
6.
When
I increase the output amplitude on my stimulator modules during
stimulation, the overload light comes on - what's happening?
The
D333H and D343 modules include an overload LED which serves to
warn the user if the current requested or required cannot be
supplied by the stimulator. The D333H modules have an upper
limit of 1A, so if the impedance of the preparation and the
voltage settings are high enough, the module will reach the
maximum output current and indicate an overload. The same
effect can be seen with the D343 except this is a constant current
device and will supply up to 500mA until it reaches a compliance
limit of 100V. If you run into the above problems,
consider whether you need to have the output settings so high and
also check that your preparation and electrodes provide a low
impedance connection.
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