Search found 23 matches

by BentRods
Fri Dec 09, 2011 5:28 pm
Forum: Parallel Port Products
Topic: Frequency measurement adc11-12
Replies: 3
Views: 5455

Re: Frequency measurement adc11-12

I've used a NCV1124 from ON semi that has a VR sensor input and outputs a square wave, I've scaled this output from 5.0v down to 2.2v with a resistor divider. The problem is when the gear stops rotating there is no input and picolog displays Hz / rpm that's unrealistic. Here is a little trick that I...
by BentRods
Tue Dec 06, 2011 1:35 am
Forum: Parallel Port Products
Topic: Frequency measurement adc11-12
Replies: 3
Views: 5455

Re: Frequency measurement adc11-12

Hi, OK thanks for the reply, one thing that happens a lot is that when the signal stops the freq / rpm will show a high value as if there is interference of course 50Hz is a problem when using laptops and the AC power supply. I have always tried to observe sheilding and attention to grounding. Mostl...
by BentRods
Sun Dec 04, 2011 3:41 pm
Forum: Parallel Port Products
Topic: Frequency measurement adc11-12
Replies: 3
Views: 5455

Frequency measurement adc11-12

Hi typically what sort of signal is best for the freq measurement of approx 0 to 100Hz with the adc11 and PLW logging every 1 sec ? I have been using a signal is conditioned using a 74HCT schmitt trigger with a square wave output with an amplitude of 2.5v with mixed results, I dont know if this was ...
by BentRods
Wed Apr 25, 2007 8:07 am
Forum: General Software Discussions
Topic: Successful Frequency measurement with what languages ?
Replies: 11
Views: 9083

Thanks ok I'm no Guru of C, could you tell me what heading of the 5 is the one in question here, obviously not the USB ones my guess is... * Collect a block of samples when a trigger event occurs ??? but something doesn't seem correct here, I'm thinking this is for the Trigger for when an Event occu...
by BentRods
Fri Apr 20, 2007 3:56 pm
Forum: General Software Discussions
Topic: Successful Frequency measurement with what languages ?
Replies: 11
Views: 9083

Geee... I thought this was where I should come for support and ask my silly questions. oh btw I am a Happy customer with the products and software I have.... I've not asked for anyone to write code for me just a snippit of code showing what Functions have been called from anyone who had any success ...
by BentRods
Mon Apr 16, 2007 9:27 am
Forum: General Software Discussions
Topic: Successful Frequency measurement with what languages ?
Replies: 11
Views: 9083

Mark wrote "you can take the volts versus time data and count the number of times the signal 'crosses' the mean value in a given time period. This should give a reasonable estimate of frequency" here your telling me how its done, but not how to do it by calling the appropriate Functions from the ADC...
by BentRods
Sat Apr 14, 2007 2:01 am
Forum: General Software Discussions
Topic: Successful Frequency measurement with what languages ?
Replies: 11
Views: 9083

In my 1st post I said I'm calling the adc1132.dll, the big picture is I'm trying to figure out how Freq measurements are done as there is no support for this topic in the LabView examples and help files that I can see nor much in the way of a juicy answer's in my other posts about what functions to ...
by BentRods
Fri Apr 13, 2007 3:24 pm
Forum: General Software Discussions
Topic: Successful Frequency measurement with what languages ?
Replies: 11
Views: 9083

sorry I never mentioned this but I was thinking of Freq measurement in PLW.
how is this handled ?
Regards
Thomas
by BentRods
Thu Apr 05, 2007 4:37 pm
Forum: General Software Discussions
Topic: Successful Frequency measurement with what languages ?
Replies: 11
Views: 9083

Successful Frequency measurement with what languages ?

I'd be glad to hear if anyone has been successful with any of the included example files when it comes to measuring frequency using any of the supported programming languages in this forum, I'd appreciate some insight into the Functions that were called and how you went about it. btw I'm calling the...
by BentRods
Sat Mar 24, 2007 10:31 am
Forum: LabVIEW
Topic: Frequency measurement with the ADC11-12
Replies: 7
Views: 8540

Sarah
I've put a lot of effort in this VI do you think that its possible to look at or provide a header file for the adc1132.dll . This header file will describe the various functions and what are the arguments and return value.

Thomas
by BentRods
Thu Mar 01, 2007 5:44 pm
Forum: LabVIEW
Topic: Frequency measurement with the ADC11-12
Replies: 7
Views: 8540

I'm not looking for the source code here but could you tell us how its done in Picolog when you call the dll , perhaps that will give some insight to the inner workings .... I'm thinking it must be one or more of the function names listed from the dll . you will need to write the code to calculate t...
by BentRods
Tue Feb 27, 2007 12:25 pm
Forum: LabVIEW
Topic: Frequency measurement with the ADC11-12
Replies: 7
Views: 8540

Hi Sarah with regards to the LV examples and I've looked at them for the past few weeks, the adc_11single.vi examples works just fine for an Analog signal, however upon inspection of the routines in the "Call Library Function" under the menu "Function name" I don't see anything that stands out with ...
by BentRods
Mon Feb 26, 2007 8:32 am
Forum: LabVIEW
Topic: Frequency measurement with the ADC11-12
Replies: 7
Views: 8540

Frequency measurement with the ADC11-12

Could somebody please dangle a big fat juicy carrot for me on this topic...

Thomas
by BentRods
Fri Feb 23, 2007 1:42 am
Forum: LabVIEW
Topic: Frequency measurement with the ADC11-12
Replies: 7
Views: 8540

Frequency measurement with the ADC11-12

Hi All
reading through the help files I don't see any info with regards to configuration of the call dll file ... so how do you measure frequency ? if you have a sample VI's or some pointers to guide me I'd appreciate the help.

TIA
Thomas
by BentRods
Wed Nov 09, 2005 11:54 am
Forum: PicoLog
Topic: ADC11 Freq measurement in LabView
Replies: 7
Views: 6933

Hi my comments are embedded below >>What kind of Labview support are you looking for? If you would like to send your .VI to support@picotech.com we can have a look at it.<< I would like to see a sample VI that will measures Freq with that existing Sample VI in the download, my VI skills are not dang...