Processing Scope Waveforms

Hi,
I want to process waveform coming from Scope.
I have to calculte positive peaks and get average value for values below 0.
Right Now I have done this
1- Replaced all values above 0 with 0.
2- Calculated there average values through basic DC RMS calculation VI.
3- Initialized an array with this average value.
4- Searched for maximum value between two consecutive 0 values and placed this value in already initialized array.
this whole processing is taking a lot of time.
Could you please provide a better way of doing this.
I tried to use Waveform Peak Detection VI but it is calculationg peaks through maxima and minima and giving me a lot of peak points although I reqiure only 1 in a period.
Please see attached I/p and Required O/P waveforms
Labview user
Attachments:
Ip Waveform.JPG ‏25 KB
required op.JPG ‏32 KB

Aojha wrote:
Hi,
I want to process waveform coming from Scope.
I have to calculte positive peaks and get average value for values below 0.
Right Now I have done this
1- Replaced all values above 0 with 0.
2- Calculated there average values through basic DC RMS calculation VI.
3- Initialized an array with this average value.
4- Searched for maximum value between two consecutive 0 values and placed this value in already initialized array.
this whole processing is taking a lot of time.
Could you please provide a better way of doing this.
I tried to use Waveform Peak Detection VI but it is calculationg peaks through maxima and minima and giving me a lot of peak points although I reqiure only 1 in a period.
Please see attached I/p and Required O/P waveforms
What you have described doesn't make sense given your waveform. You said "get positive peaks and get average value for values below 0". There are no positive peaks with amplitudes below 0 in your waveform. There are VALLEYS however.
But then your output waveform shows that you have marked 8 positive peaks of amplitude 2.5 (which are ABOVE 0) and zeroed all other values, including the first two periods of the waveform. Please explain.
“A child of five could understand this. Send someone to fetch a child of five.”
― Groucho Marx

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Message Edited by Dejun on 08-30-2007 10:34 AM
Attachments:
code.jpg ‏86 KB
code.vi ‏49 KB

tbob wrote:
Ravens Fan:
Read his post again:
"I am using 25Hz pulse signal to externally trigger DAQmx through PFI0. I set 100Hz for the rate input of the DAQmx timing VI since LabVIEW help says "If you use an external source for the Sample Clock, set this input to the maximum expected rate of that clock. " .
When I use Write Measurement File express VI, I found in the resulting text file, the dt is 0.01 instead of 0.04, i.e., the value of dt in the waveform data is not determined by external PFI0 signal, but by the rate input for the DAQmx timing VI. Also, I found t0 does not always start from zero. However, from the display of data plot, I am sure the acquisition is at 25Hz."
He says in the 1st paragraph that he sets theDAQmx timing to 100Hz because that is his maximum expected clock rate. In the 2nd paragraph he says that in his measurement file dt is 0.01 instead of 0.04. This indicates that the dt value is determined by the DAQmx timing rate, not the PFI0 clock rate. I am thinking that he should set the DAQmx timing to match the PFI0 timing, 25Hz.
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Message Edited by Ravens Fan on 08-31-2007 12:18 PM

Address from outside the oracle process' scope

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1* select * from x$kqfta where indx=0
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ADDR           INDX    INST_ID   KQFTAOBJ   KQFTAVER KQFTANAM                         KQFTATYP   KQFTAFLG   KQFTARSZ   KQFTACOC
0C49BF20          0          1 4294950912          2 X$KQFTA                                 1          0         60         10Column ADDR points to memory where the record data is kept.
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SQL> /
SPID
20067
[oracle@node0 ~]$ pmap -x 20067
20067:   oracleorcl (DESCRIPTION=(LOCAL=YES)(ADDRESS=(PROTOCOL=beq)))
Address   Kbytes     RSS    Anon Locked Mode   Mapping
+<cut>+
00d59000    7028       -       -       - r-x-- libjox10.so
01436000     260       -       -       - rwx-- libjox10.so
01477000       4       -       -       - rwx--    [ anon ]
08048000   77032       -       -       - r-x-- oracle
0cb82000     324       -       -       - rwx-- oracle
0cbd3000     120       -       -       - rwx--    [ anon ]
0ce3b000    1088       -       -       - rwx--    [ anon ]
20000000 528384       -       -       - rwxs-    [ shmid=0x55000d ]
b7ab7000     640       -       -       - --x-- zero
b7b57000     128       -       -       - rwx-- zero
b7b77000    1280       -       -       - --x-- zero
+<cut>+
b7fb0000      28       -       -       - rwx-- zero
bfac6000     200       -       -       - rwx--    [ stack ]
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08048000   77032       -       -       - r-x-- oracle
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Rob K
Measurements Mechanical Engineer (C-Series, USB X-Series)
National Instruments
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