How can I use FREQ_OUT output frequency signal
Now,I use VXI-MIO-64E-1 board and Windows/CVI,I want to know how can I use FREQ_OUT single.
Thanks a lot,
Wang
The Frequency Scalar of the DAQ-STC based devices is essentially a third counter that can be programmed only for continuous pulse train generation. See the knowledgebase link below for more info on this. Since this counter is only four bits, this limits the clock divisors to 2^4 or 1 thru 16. Therefore the only frequencies that can be programmed for output on the FREQ_OUT line are timebase / (integer between 1 and 16).
How do I use the FREQ_OUT pin on my E series board?
According to the NI-DAQ Function Reference Manual, the signal name should be ND_FREQ_OUT. The source can then be ND_NONE, ND_INTERNAL_20_MHZ, or ND_INTERNAL
_100_KHZ. sourcespec would follow respectively as ND_DONT_CARE, 1 through 16, or 1 through 16. Note that selecting ND_NONE will disable output on the FREQ_OUT pin.
Thanks,
Heath
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Message Edited by GerdW on 02-28-2010 08:35 PM
Best regards,
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Hello,
Here is my application: I need to use a 6602 counter/timer to generate a pulse train of certain frequency and duty cycle. On each rising edge of this pulse train, I need to output an arbitrary waveform on Ch. 0 of an niFGEN (5422) AND acquire data from CH. 0 of an niSCOPE (5124). I also need to synchronize the niFGEN and the niSCOPE to the same clock used for the pulse train (6602/ctr0). This process needs to continue until the user stops the system.
I can generate the pulse train using the 6602 just fine using ctr0, but the pulse train shows up on OUT0 by default. When setting up the niFGEN and niSCOPE to trigger on rising/positive slope edge, OUT0 is not an option for either device as a source for the digital rising edge (pulse train). The main options for both are PFI0-3 and RTSI lines.
Questions:
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Images of my current front panel and block diagram are attached. If you would rather have the actual VI's just let me know. Any help and/or explanation on this is greatly appreciated. Thanks in advance.
Attachments:
Front_Panel_Control.jpg 278 KB
Block_Diagram_Control.jpg 263 KBHello Cgifford,
Welcome to National Instruments Forums.
To output your signal to the PFI lines,
you can use external connectios between OUT0 and PFI lines. You can also use
the backplane to do so by routing into the same RTSI line.
1)
On the SCOPE and FGEN, the name of the
terminals are actually “PXI Trigger Line x/RTSIx” but on the 6602 you might
need to route the signal using the property:
You can also use the DAQmx route signal which perform the same opperation.
2)
This will depend on the frequency of
your pulse train. If this is lower than about 10 ms, then you can probably
place this on a loop and start and stop the acquisition every time. If the
frequency is higher than this, you will have to use:
- Scripting on the FGEN side (read more)
- MultiRecord Fetch (more information in the scope help file
section “Acquisition Functions Reading versus Fetching”).
3)
The short answer is yes. The longer one
might depend on how tight you need the synchronization to be (us, ns, ps). For
very tight synchronization, you should look into here.
Message Edited by Yardov on 06-18-2007 03:14 PM
Gerardo O.
RF Systems Engineering
National Instruments
Attachments:
property.JPG 7 KB -
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" </xsql:query>"+
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Hii,
I am using JDeveloper 11g ADF BC.
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I hv attached BC in this application. I want to use the login usercode in the next pages after login screen. Next screen contains 3 list items which will be populating based on the user. So I created <af:selectOneChoice> using the BC( Just drag & dropped the column into the page from the data controls). But in the data control i want to use this usercode for passing the condition. Now Data is coming without any condition.
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package login.backing;
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import java.util.List;
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String pid = this.getPid().getValue().toString();
Connection conn;
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I have a 8 slot PXI system with 2 NI PXI 6508 and 1 DMM 4070 in it. I want to get started with programming the digital I/O cards (6508)! How can I use this cards with LabView 7?what is the best way to get started, or where can I get examples showing how to use the several channels?
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The best way to get started is to decide if you want to use traditional NI-DAQ or NI-DAQmx. Recently we released NI-DAQ 7.1 which provides NI-DAQmx support for the PXI-6508. In my opinion, NI-DAQmx is more efficient and much easier to use.
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I have written this query which gives me the comparative data based on this week and next week. How can I use Lead/Lag in this query.
WITH CURRENT_WEEK
AS ( SELECT QPAQ.YEAR YEAR,
QPAQ.SEASON SEASON,
REGEXP_SUBSTR (QPAQ.SERIES_NAME, '[^/]+') ACC_SERIES,
TO_NUMBER (QPAQ.WEEK) WEEK,
MAX (QPAQ.FAILURES) FAILURES
FROM QAR_PLAN_ACC_QTY QPAQ, QAR_PLAN_THRESHOLD_LST QPTL
WHERE QPTL.CATEGORY_ID = 7
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AND QPAQ.SEASON = QPTL.SEASON
AND QPAQ.SERIES_NAME = QPTL.MODEL_SERIES
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QPAQ.SEASON,
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TO_NUMBER (QPAQ.WEEK)
ORDER BY REGEXP_SUBSTR (QPAQ.SERIES_NAME, '[^/]+')),
LAST_WEEK
AS ( SELECT QPAQ.YEAR YEAR,
QPAQ.SEASON SEASON,
REGEXP_SUBSTR (QPAQ.SERIES_NAME, '[^/]+') ACC_SERIES,
TO_NUMBER (QPAQ.WEEK + 1) WEEK,
MAX (QPAQ.FAILURES) FAILURES
FROM QAR_PLAN_ACC_QTY QPAQ, QAR_PLAN_THRESHOLD_LST QPTL
WHERE QPTL.CATEGORY_ID = 7
AND QPAQ.YEAR = QPTL.YEAR
AND QPAQ.SEASON = QPTL.SEASON
AND QPAQ.SERIES_NAME = QPTL.MODEL_SERIES
GROUP BY QPAQ.YEAR,
QPAQ.SEASON,
REGEXP_SUBSTR (QPAQ.SERIES_NAME, '[^/]+'),
TO_NUMBER (QPAQ.WEEK)
ORDER BY REGEXP_SUBSTR (QPAQ.SERIES_NAME, '[^/]+'))
SELECT CURRENT_WEEK.YEAR,
CURRENT_WEEK.SEASON,
CURRENT_WEEK.ACC_SERIES,
CURRENT_WEEK.WEEK,
CURRENT_WEEK.FAILURES,
(CURRENT_WEEK.FAILURES - LAST_WEEK.FAILURES) FAILURES_COMPARE
FROM LAST_WEEK, CURRENT_WEEK
WHERE CURRENT_WEEK.WEEK = LAST_WEEK.WEEK(+)
ORDER BY CURRENT_WEEK.WEEK;Output is like this.
YEAR SEASON MODEL WEEK FAILURES Failures_COMPARE
1 2011 SUMMER VGP-BMS15 49 10
2 2011 SUMMER VGP-BMS15 50 28 18
3 2011 SUMMER VGP-BMS15 51 30 2
4 2011 SUMMER VGP-BMS15 52 40 10Edited by: BluShadow on 06-Jan-2012 13:26
added {noformat}{noformat} tags. Please read {message:id=9360002} to learn to do this yourself in future.You would jettison the entire LAST_WEEK subquery. Then replace your failure calculation with
current_week.failure - lag(current_week.failure) over (order by current_week.year, current_week.week) as failures_compareI suppose you might want to think about renaming the sub-query as well ....
Cheers, APC
Edited by: APC on Jan 6, 2012 1:41 PM -
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