The peak in the signal may introduce high frequency components (>
2000Hz in your case). So when you apply a lowpass filter, it will be
affected. The disstortion when the order is high is because of your
signal is of finite length (You do not have all the history data of
the signal). A less than
i also tried very high order (=300)filter, and found that, when the
filter order is too high, the filtered signal is disfigured. I mean
very different from the original signal. why? is there any guidance
as to what order of filter should i use for my signal.
i also find that compared to the original data, the filtered data (i
mean in frequency domain ) changed the magnitude of the peaks, the
position of the peaks are the same(this is as expected), why the
magnitude changed? and the higher the order of the filter, the more
the magnitude changed.
Hi,
An ideal lowpass filter will let all the frequencies under the cutoff
frequency (2KHz in your case) pass without any change and filt out
those greater than the cutoff frequency totally. Theoretically, when
the order is infinte, you'll get an ideal lowpass filter. However,
infinte order is no
I'm trying to filter out the high frequency noise(>2000hz), so I use a
lowpass filter(butterworth filter) and set the frequency to be 2000
hz, but i noticed that when i use different order of filters, i got
different results.
i have tried order=20,40,80,200, what on earth does the filter order
mean
Hi all,
Hurray, the I/O Assistant does work.
Thanks to your various help.
My HPIB gear responds in GPIB I/O Assistant.
I also see a working I/O Block Diagram now.
Besides, the driver for my TEK DSA602 seems to work too ( as LabView
Instrument vi ).
I realize that I have a long long way to go, B
Hi Peter,
You should be able to use the IO assistant from within the Block
Diagram in LabVIEW. From the splash screen in LabVIEW select new, and
then from the templates choose GPIB>Read and Display.
Now in the block diagram you can double click the instrument IO
assistant and configure it to query
n there .
Obviously I do miss something again.
It is a long way to Tipperary and I feel so dumb.
So, please help.
Thanks.
Peter.
Peter,
It looks like Instrument I/O Assistant is not installed. You can
install it from the Driver CD that came with LabVIEW, or you can
download an installer for it from NI's website http://digital.ni.com/softlib.nsf/954feaeea92d90918625674b00658b83/f3ca0298c715bcd886256e82005758e5?OpenDocument"
OK Brian,
Thanks.
I found one driver only ( for my TEKTRONIX DSA602 ).
No drivers found for my HP 3336B , HP 8922M , HP 8525A , HP 8568B and
others.
In LabView 7 I now see the Instrument I/O Assistant.
I clicked it and it prompts me " Please find the VI named " I-O
Assistant Block vi " ".
I st
LabVIEW can do VISA and NI-488.2 directly; you don't need C++ or VB.
First of all, you should see if there are instrument drivers available
for your instruments. There are thousands of free drivers available
on http://ni.com/idnet/. Search there first, because if you can find
a driver for any of
Sorry for these very very basics but I failed to resolve these myself
though I did my best.
I try to make a GPIB i/o on a block diagram.How to ?
I cannot find such in the functions menu.
I find only a vi for typing direct commands ( which does work ).
I tried many many variances, but end of all i
Hi Wireworkers,
I apologise for gatecrashing the LV discussions but I am desperately in need
of a Texas Instruments ADS5421 14-Bit, 40MHz Sampling Analog to Digital
Converter.
We have tried to source the part from TI, without success as they will not
deal with companies directly and their Distrib
Hi Rob,
Appreciate your input. Will double check on the parameters again.
Cheers!
ian
The most likely cause of that error is calling a function in a DLL
with the incorrect number of parameters. Too many or too few
parameters can mess things up quite well (trust me on this one - been
there, done that). Usually, no damage is done. Check the function in
your DLL and reproduce the param
Dear,
I am Hajia Mariam Abacha, the widow of the late Gen. Sani Abacha, former Nigerian
Military Head of State who died mysteriously as a result of Cardiac Arrest. Since my
husband's death, my family is under restriction of movement and that notwithstanding,
we are being molested; policed and o
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