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Newsletter - Edition
Four
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August 27, 2008
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We are moving
Bozeman, MT - August 2008
- Neuralynx continues to grow which means we are running out
of room at our current location, therefore we are moving to a bigger
location in Bozeman. The move will take place over the September
Labor Day weekend, which means we will be up and running with no interruptions
on Tuesday, September 2, 2008. The move will help us in making our
continued efforts to improve our manufacturing and customer services more
effectively. Please note that our phone numbers and email addresses
will remain the same, however, our mailing/physical address will change
to: 105 Commercial Drive, Bozeman, MT 59715.
Please note this correction notice about our previous
Newsletter with the incorrect SFN 2008 dates. It is not
in December, it is actually for November 15-19, 2008. We apologize
for any confusion. Neuralynx will be at Booth # 533.
Please come and see us!
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TECHNICAL TIP OF THE DAY
- Digital Lynx, DSP filters in Cheetah, and periodically checking
proper operation
by: Casey
Stengel
The Digital Lynx system
is a very complex, high performance data acquisition system. The
mix of high resolution A/D converters, high quality-low noise front end
electronics and all of the nano-second logic operations that occur to
packetize and send the acquired data over the fiber optic cable to the
Cheetah computer gives the system all the features that make it the best
performing system for electrophysiology recording. This complexity
also implies, like any other electronic device, that there will be
failures over time, even though we have found it to be very reliable in
user's lab. Normally failures will result in Cheetah not receiving
data and the problem is very obvious. There is the possibility that
a failure will cause distortion in the acquired analog data. This
problem can be compounded by Cheetah's DSP filters (like any other
filter) masking some distortions.
It is a wise idea to check your entire system using the test "Signal
Mouse" with a sinewave signal and verifying expected sinewaves shown
on the displays. In a few weeks we will release a
semi-automated test procedure for this purpose. A good manual
procedure would be the following:
- Run a CSC configuration that
matches the number of channels in your system;
- Use the Properties Page for the
CSC channels, select all channels, and turn OFF all Hi-Cut DSP
filters;
- Use the Properties Page for the
CSC channels, select all channels, and set the Input Range to 50
microvolts;
- Setup a very small signal of 30
microvolts (30 millivolts into the Signal Mouse) at 100 Hz;
- Start acquisition and adjust the
time scale of the CSC Time Window displays to see the Sine
Wave;
- You should see a nice pure sine
wave with no distortion and about 5 microvolts of noise;
- This tests the low level noise of
the system and the low order bits of the A/D converters for each
channel.
Perform
the above process with Signal Mouse levels of 200 microvolts, 2
millivolts and 50 millivolts.
After the last 50 millivolt input test turn off the CSC channels' LOW CUT
filters. The maximum DC offset should be on the order of 10
millivolts for AC Input Boards and 1 millivolt for DC Input Boards.
Depending on your system setup of ERP-27's, DRS-36's, etc you should also
check reference subtraction and reference panel operation using the
Signal Mouse's Reference switches and the Reference Panel/Board's
reference selection functions. This will test the external noise
rejection of the system.
While the Digital Lynx systems are reliable the entire system should
still be checked periodically for proper operation. As mentioned
above we will release a "semi-automated" test thru an
Experiment Control program using a Minirator function generator as the
signal source.
If you have questions on this system feature feel free to contact
Technical Support at Support@Neuralynx.com or give us a call.
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Receiving
Emails/Updates/Newsletters
If you
do not wish to receive the newsletters, but do wish to
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TRACKING
THE STATUS OF YOUR ORDER
For
ordering, checking up on an order's status, or shipping details, please
be sure to use our sales@neuralynx.com
email address.
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TECH
SUPPORT ISSUES
For
tech support questions, please be sure to use our support@neuralynx.com
email address.
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THE
NEURALYNX MISSION STATEMENT
"We
are the preferred provider of high quality electrophysiology hardware and
software solutions for the neuroscience research community and the
specific markets of epilepsy research and multi-unit neurosurgery
support."
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© Copyright 2008, Neuralynx,Inc.,
All Rights Reserved.
105 Commercial Dr., Bozeman,
MT 59715
Phone: (406) 585-4542 Fax:
(406) 585-9034
sales@neuralynx.com
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