Read encoder signal with 9201

Hi
I have a quite uncommon problem. I need to acquire the encoder signal with a NI-9201 (analogue module).
Is this even possible? Of course I saw I that I should use a NI-9401 but my chassis is full...
I already tryed to acquire impulse signals with such a module but they were slower.
Thanks for any help.
Yves

Hi Yves,
when you acquire data from an encoder, do you mean a quadrature encoder or rotary encoder?
This encoder generates a binary or digital signal.
Of course, you can always acquire a digital signal with an analog input module. This isn't recommended and necessary when you can use a pre-built api in the palettes for digital modules.
When there is no free slot you can think about an expension chassis or a single carrier. This depense on your application.
How did you acquired the slower signal until now?
Kind Regards,
Philipp K. | NI-Germany

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Hi Dani,
here's the two-loop version...
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Problem Counting A and B Encoder Signals on Two Counters.

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Attachments:
Main Encoder Tester.vi ‏883 KB

Hello Van626,
After looking over your code for measuring a encoder, I would suggest performing this acquistion in a different way. The reason why is that it is not advisable to create and clear or start and stop in a while loop. In order to get around this, here are some ideas I had:
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Acquire encoder position with Motion and DAQ

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Attachments:
Encoder Speed.vi ‏112 KB

Hi,
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Hi Bentup,
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untitled1.jspx:
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<jsp:root xmlns:jsp="http://java.sun.com/JSP/Page" version="2.0"
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Hi,
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Attachments:
v603.png ‏320 KB
v603.vi ‏186 KB

Jeff Bohrer wrote:
Basic math gives me a bit of pause on this approach. You are sampling at 50 times the frequency of interest so you get 50 samples per cycle. your phase resolution is 1/50th cycle or 7.2 degrees +/- noise. You will need to samlpe faster to reduce phase resolution or average multiple readings (at a time cost that is signifigant)
Jeff- (Hardly Working)
I am sampling at 100 times the sine wave's frequency and 200 times the square wave's frequency. Increasing the sampling rate completely solves my problem. But since I am acquiring several other inputs, I cannot afford a sampling rate higher than 5kHz.
F. Schubert wrote:
I'm not a signal processing expert, but here my basic understanding.
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Felix
www.aescusoft.de
My latest community nugget on producer/consumer design
My current blog: A journey through uml
An interesting view. the sine wave can indeed be looked as a second harmonic of the square wave. I will implement your idea and get back to you as soon as I get some results. But since I have very limited knowledge of signal processing, it might take me a while to get my hear around the solution you mentioned.

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31
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36    FOR cur IN 0 .. dbms_xmldom.getLength(l_nl) - 1 LOOP
37       l_n := dbms_xmldom.item(l_nl, cur);
38       --lv_value := dbms_xmldom.getnodevalue(dbms_xmldom.getfirstchild(l_n));
39       dbms_xslprocessor.valueOf(l_n, '@Nr', lv_value);
40       dbms_output.put_line('Nr : '||lv_value);
41    END LOOP;
42
43    dbms_xmldom.freeDocument(indomdoc);
44
45 end;
46 /
Nr : 1
Nr : 3
PL/SQL procedure successfully completed

H264 encoding issue with FlashPlayer 11

Hi,
When encoding live in h264 with the FP 11 then playing it live on another client (through FMS r) the video sometimes (1/3 of times) has major skips or jerks. It's almost as if the video goes back to some older keyframes and then returns to live. Same experience with non-h264 produces smooth video.
If the server (FMS ) records the video, the replay looks smooth, which is strange because I would have assumed the FP was not encoding well with H264.
Has anyone had this issue? please reply
Thank you.

Hi,
When encoding live in H264 with the FP 11 then playing it live on another client (through FMS r) the video sometimes (1/3 of times) has major skips or jerks. It's almost as if the video goes back to some older keyframes and then returns to live. Same experience with non-h264 produces smooth video.
If the server (FMS ) records the video, the replay looks smooth, which is strange because I would have assumed the FP was not encoding well with H264.
Has anyone had this issue? please reply
Thank you.

Read encoder signal with 9201

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