PWM & HAVE Synch

Hello

I searched the forums and support without result. What I've checked so far is: http://decibel.ni.com/content/docs/DOC-10785  http://forums.ni.com/t5/Multifunction-DAQ/How-to-Syncronize-Analog-Digital-PWM-Input-and-Analog-Digi... and the included LabVIEW examples.

What I try to achieve is easier than reading a PWM signal and analog, sync signal using LabVIEW 8.2.

I am in a position:

-A PWM signal at approximately 1 050 Hz using two counters (the one used to measure the exact frequency and the other to measure the width of the high pulse)

-Analogue signal between - 10 v and 10 v (from a load cell). I'll add another analog signal from the device even in the future, but it's not relevant.

That's what I have so far:

I am faced with mainly a problem with this:

-Some of my width and frequency measurements are wrong. So bad as measures of extremely tiny width or very high frequency (up to 2500-3000 Hz) measures. I can avoid this by "filtering" the data... But I don't know I'm doing something wrong and I should be able to get the OK from the beginning data.

I guess I'm wrong measures leave due to meter reading meter "at any time" some of the impulses to cut. I expect the meter to read continuously behind the best time available with my expected frequency / width and just throw the excess data. For example: at time 0 it returns the first value and in dt, it will return the value measured, throw data inbetween. So if my rate is 100 Hz and my PWM is faster ~ 1000 Hz, I have about 10 steps PWM to choose from for each measure of AI.

Also, is there any other way to measure a PWM with a single meter (part of guess the frequency)? In the future, I need to read 2 PWM signals and their reading with a single meter will facilitate my work, I want to avoid having to synchronize the two planks.

I would appreciate greatly any help on this, because I'm stuck.

Thanks in advance,

Xavi

Sorry to answer me...

Now I feel completely stupid. I was counting on the stability of the measured signal. I just checked my vi with a pulse train produced material DAQ on MAX and it works perfectly. This problem may be on the measured signal, unfortunately I have no way to check it out right now.

Anyway, problem solved...

Tags: NI Software

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