Measure TTL signal also when frequency is low or 0

[ThiCop]

Hello,

About the amount of counters used.

X-series cards (63xx cards) can indeed create a finite pulse train with one counter (STC3-type).

M-series cards (62xx cards) have counter of the STC2-type.

Here you'll need 2 counters to create a finite pulse train:

https://knowledge.ni.com/KnowledgeArticleDetails?id=kA00Z000000P7eESAS&l=en-US

[TimLeiden]

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@ThiCop wrote:

Hello,

About the amount of counters used.

X-series cards (63xx cards) can indeed create a finite pulse train with one counter (STC3-type).

M-series cards (62xx cards) have counter of the STC2-type.

Here you'll need 2 counters to create a finite pulse train:

https://knowledge.ni.com/KnowledgeArticleDetails?id=kA00Z000000P7eESAS&l=en-US

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I have an M-card (6259e), and I'm using two counters, one to generate a finite pulse train (ctr1), the other (ctr0) is counting edges between the rising edges of ctr1.

The counting is working just fine, except I get the cumulative values while I want the individual counts per bin. Currently I'm solving this ins software, but I would prefer the card to do it.

[ThiCop]

Ow sorry, let me recapitulate.

I forgot one important part in my sentence (must have been a bit off-guard while writing it).

I meant a finite retriggerable pulse train.

My apologies for the inconvenience.

[falkpl]

I didnt have this problem, I used 3 "old style counters" on a 6608 counter card. 

I made a retrigerrable finite pules train and then a simple continious buffered (NOT FINITE) counter on the 3rd, newer devices (X series) can do this in 2 I think.  This way on each event trigger I was able to get an array of N bins of defined duration.  Maybe the finite counts are what is causing a problem?

[ThiCop]

Hey Paul,

A bit off-topic to the question, but I would like to give you some further details about the counters.

- 62XX devices use STC2-counters

- 63XX devices use STC3-counters

- 66XX devices use TIO-counters/chipsets (again a different type 😉 )

So what you saw/experienced is perfectly possible.

I cannot test it currently (with real hardware), but I can do a test tomorrow at the office if you would like that.