Buffered Edge Counting 20 MHz with duplicate count prevention

Dear all,
I went through the specs of several boards (M- series, S- and E- series, 6602 etc...). It seems that these boards can count edges with duplicate count prevention on at a maximum rate <= 20 MHz (i.e., 1/4 of 80 MHz) - but maybe I have misunderstood the docs.
Is there a NI board capable of buffered edge counting with a general purpose counter for random events going at rates from 0 Hz to > 20 MHz? Do I need to look for a reconfigurable board?
Thanks in advance.

Dear Elizabeth,
Thanks for the answer.
In my application, events arrive asynchronously (actually, randomly). During the duration of a gate (namely, 1 microsecond), one expects anything from 0 to many (i.e., possibly more than 20, up to 80) events. This requires duplicate count prevention.
I may have misunderstood the specs for M series boards, but the document:
Using Duplicate Count Prevention for Counter Tasks in NI-DAQmx
from the NI web site, for instance, states that:
"All the other timebase edges that occur while the external source input is high are ignored. If no source edges are detected between two gate edges, as shown in Figure 3, duplicate count prevention ensures that pulse measurements return zero because the external source must be logic high to allow the internal timebase to increment the count register. This reduces your maximum source frequency to quarter of the original maximum (80MHz) timebase for NI-STC II and NI-TIO boards. Therefore duplicate count prevention should only be used if the frequency of the Source signal is 20 MHz or less.
Duplicate count prevention should only be use in the following situations:
Counter measurements
The counter Source is using an external signal (such as PFI x)
The frequency of the external source is 20 MHz or less
What's your take on that?
Thanks for your time.

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Greetings,
Please see 8-3 of http://www.ni.com/pdf/manuals/371931f.pdf
This shows that you can use the counter to record the current value stored in the counter that is being driven by a clock. This has the upshot of creating an array that has the times of the event. To do this, you need to set the source and gate properly. These can be set first by configuring the counter to Count Edges (see DAQmx Create Channel) and then updating the CI.CountEdges.Term (in the DAQmx Channel Properties) to the channel that has your signal and SampClk.Src (in the DAQmx Timing Properties) to a known clock, such as the onboard SampleClock.
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Hello,
The behavior of non-cumulative event counting is equivalent to period measurement. Additionally, the timeouts when no edges occur on your event counting terminal are the result of duplicate count prevention. In DAQ 7.4, the default behavior of duplicate count behavior should take care of this for you, but if you cannot upgrade to DAQ 7.4, I'd do a search of the discussion forums for "duplicate count prevention". There are a number of previous posts about this attribute, including this one.
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Edited by: user598986 on Sep 23, 2009 11:32 PM

user598986 wrote:
Hi,
I have a scenario where I have a table TABLEA which has 3 values
10 ABC
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20 DEF
I want to pick up the duplicate count as wel as non duplicate count:
I have used the following query:
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But I am finding problem in getting the non-duplicate count .
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Edited by: user598986 on Sep 23, 2009 11:32 PMHi,
perhaps this query makes your job:
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                      15-SEP-09 01-DEC-09
john                  27-AUG-09 16-SEP-09 16-SEP-10
                      28-FEB-09 20-SEP-09
Dave                2 17-JUN-08 16-SEP-09 02-JUL-11
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2 (
3 select hire_date, 'simple' id from test_
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5 select test_.hire_date, 'simple' id
6 from test_
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HR: XE > Regards,
Ion

Buffered Edge Counting 20 MHz with duplicate count prevention

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