Sine, Square & Sawtooth sweep generation with variable duty cycle/rise time & fall time

Dear All !
I request and need some candid advices on the subject issue keeping in view the following notes:
1) I am a novice in LabView.
2) I was an average Electronics Engineering graduate who graduated about 9 years ago and since then I have not been involved in Electronics Engineering.
I have undertaken a task or generation of Sine, Square and Saw Tooth wave forms. All these waveforms are to be frequency swept form 1 Hz to 100 kHz. The amplitude of all these waveforms should be able to be adjusted. The duty cycle of Square Wave should also be adjustable (or better be able to be swept). Likewise the rise time and fall time of sawtooth wave should also be adjustable (or better be able to be swept).
I am considering other options as well but wanna try it on LabView.
I wish to ask that is it possible to execute this task in Labview 7.0? If possible then considering the para 1 & 2 above, is it possible for me to finish this task in 15-20 days if I work on this for about 3 hours a day? If not then what can be reasonable estimate?
I will be extremely grateful if you people can offer advice on whole project or part(s) of it.
Thanking you in advance and requesting urgent response(s).
Solved!
Go to Solution.

Check this thread.
I did some similar coding, it might be usefull to you.
http://forums.ni.com/ni/board/message?board.id=170&thread.id=493477&view=by_date_ascending&page=1
I am using ver 9.0 though.
If you work 3hr /day for 2 weeks you might as well finish book basics 1& 2 and than can do whan you need in a breeze, couple of hours.
Good luck

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Well, I will try to be more precise while answering your questions. But first let me thank you very much for your help : your comments, questions and remarks are very helpful to help me shape my project, as you shed light on particular problems I strictly had no idea before !
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Hello all
im using pcie 6320 to measure the frequency and the duty cycle of a signal.i have attached my vi & the data measured for reference.The values highlighted in red ,is my actual frequency and duty cycle but values changes for every 1 sec.Please correct me if i have any mistake.
Solved!
Go to Solution.
Attachments:
measure frquency-duty.vi ‏54 KB
HZ-DUTY.JPG ‏37 KB

You'll need to enable digital filtering--insert the following property node into your code (call the property node before starting the task):
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Michael,
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It works ok almost the whole opeartion, however, the acquisition is not 100% exact. Sometimes I get the signal in the picture A, that is ideal for what I intended.
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Solved!
Go to Solution.

Well, we can only answer question based on the information supplied! The LabVIEW Mind Reading Toolkit is still in development.
Your application is one where parallel loops may be valuable. In the acquisition loop you read data from the data acquistion device at a rate which optimizes the DAQ perfomance (the >= 2k points you mentioned). The data is transferred to an analysis loop via a queue. In the anaylsis loop you can put the data into a shift register. When more data is available from the Acquisition loop, dequeue it and append it to the data in the shift register. The Duty Cycle section will find two consecutive rising edges and the falling edge between them ( the 10 ms segment). It calculates the duty cycle for that segment. Then it uses the second of the rising edges as the first rising edge for the next segment. Repeat until duty cycles have been determined for all segments.
There are a lot of details which can be imprortant in a process like this. Many of them are dependent on other things you have not specified. What will be done with the duty cycle values? Is the raw data to be displayed? Saved to file? Discarded after the duty cycle is measured? How long will the process continue? How much data can accumulate?
Lynn

Duty cycle two AO signals with a square wave

Hello,
I am running two devices with sending two AO signals (sine wave) out simultanously in my code. I need to duty cycle my signals. in other words, I want to turn ON and OFF the devices continously.In order to do that, I am using a square wave generator with 50% duty cycle. The devices should be running when the square wave has positive values and should be OFF when it is negative.
The code almost does that, but it does not seem to be as fast as it is supposed to, based on the square wave's frequency. I was wondering if anyone can help me with this problem. In addition, I am not sure if this is the best method to do that, please let me know if there is a better way. I also attached the VI .
Thanks,
Pooya
Solved!
Go to Solution.
Attachments:
2AOsignal_dutycycle.vi ‏47 KB

I am using NI-PCI 6071E with BNC 2120as an interface. I am not sure if the problem is the hardware limits. Attahced please find the subvis which I used in my main VI.
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Attachments:
duty_cycle (New).vi ‏23 KB
duty_cycle.vi ‏25 KB

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Hello Marc,
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My Apologies for sending big code,with out proper format.
DECLARE
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a2.X_CURRENT_WEIGHT AS CurrentWeight,
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a3.X_HEIGHT AS Height,
a2.X_FAXSENT_DATETIME DateGoalWeightAchieved,
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NULL RWLDATE,
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S_CONTACT REFERRER,
S_CONTACT Consultant,
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S_CONTACT CallTaker,
S_CONTACT_X,
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MAX(LastSupplementPurchaseDate) AS LastSupplementPurchaseDate,
MAX(LastSupplementCodePurchased) AS LastSupplementCodePurchased,
MAX(LastTotalSupplementSupplyCycle) AS LastTotalSupplementSupplyCycle,
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S_ADDR_PER,
S_ASSET a,
S_PROD_INT,
S_ASSET a2,
S_ASSET a3,
UPL_CLIENT_TYPES ct,
(select /*+ parallel */ o.contact_id, o.accnt_id
from S_ORDER o, S_ORDER_XM oxm
where o.row_id = oxm.par_row_id
and trunc(oxm.X_BUSINESS_DATE - (UTC_OFFSET/24)) = trunc(p_business_date)
group by o.contact_id, o.accnt_id) oxm2
WHERE S_CONTACT.ROW_ID = S_CONTACT_X.PAR_ROW_ID
AND S_CONTACT_X.ROW_ID = S_CONTACT_XM.PAR_ROW_ID (+)
AND (S_ORG_EXT.ROW_ID = S_CONTACT.PR_DEPT_OU_ID
OR S_ORG_EXT.ROW_ID = oxm2.accnt_id
OR S_ORG_EXT.ROW_ID = S_CONTACT_XM.attrib_05)
AND ORGEXT_REF.ROW_ID(+) = REFERRER.PR_DEPT_OU_ID
AND S_CONTACT.CON_ASST_PER_ID = Consultant.ROW_ID
AND S_ORG_EXT.X_DIRECTOR_ID = ProgramDirector.ROW_ID (+)
AND S_CONTACT.CREATED_BY = CallTaker.ROW_ID
AND S_CONTACT.ROW_ID = a.PR_CON_ID (+)
AND S_CONTACT.PR_PER_ADDR_ID = S_ADDR_PER.ROW_ID (+)
AND S_CONTACT_TNTX.PAR_ROW_ID (+) = S_CONTACT.ROW_ID
AND REFERRER.ROW_ID(+) = S_CONTACT_TNTX.REFERRED_BY_ID
AND a.PROD_ID = S_PROD_INT.ROW_ID (+)
AND O.CONTACT_ID (+) = S_CONTACT.ROW_ID
AND a.STATUS_CD (+) = 'Active'
AND a.TYPE_CD (+) ='Program'
AND S_CONTACT.ROW_ID = a2.PR_CON_ID (+)
AND a2.STATUS_CD (+) = 'Active'
AND a2.TYPE_CD (+) = 'Lifecycle'
AND a3.PR_CON_ID(+) = S_CONTACT.ROW_ID
AND a3.STATUS_CD (+) = 'Active'
AND a3.TYPE_CD (+) = 'HealthSheet'
AND S_CONTACT.X_JC_ACNT_NUM = ct.CLIENT_NUMBER (+)
--AND S_ORG_EXT.LOC NOT LIKE 'F%'
AND S_ORG_EXT.ACCNT_TYPE_CD NOT IN 'Division'
--AND S_ORG_EXT.Loc in (select to_char(centreid) from UPL_LIVE_CENTRES where LIVE = 'Y')
AND (trunc(S_CONTACT.LAST_UPD - (UTC_OFFSET/24)) = trunc(p_business_date) or trunc(S_CONTACT_X.LAST_UPD - (UTC_OFFSET/24)) = trunc(p_business_date) OR (S_CONTACT_XM.X_CONSULTATION_DT = p_business_date) OR oxm2.CONTACT_ID IS NOT NULL)
AND S_CONTACT.last_upd_by not in ('1-14WD')
AND oxm2.CONTACT_ID (+) = o.CONTACT_ID
AND S_ORG_EXT.LOC <> 'CW_846'
AND (a.pr_accnt_id in (select row_id from S_ORG_EXT where S_ORG_EXT.LOC IN (Select CentreID from UPL_Live_Centres where BATCHID = p_batch_id)) or a.pr_accnt_id is null)
AND (a2.pr_accnt_id in (select row_id from S_ORG_EXT where S_ORG_EXT.LOC IN (Select CentreID from UPL_Live_Centres where BATCHID = p_batch_id)) or a2.pr_accnt_id is null)
AND (a3.pr_accnt_id in (select row_id from S_ORG_EXT where S_ORG_EXT.LOC IN (Select CentreID from UPL_Live_Centres where BATCHID = p_batch_id)) or a3.pr_accnt_id is null));
rollback;
END;
--------------------------------------------------------------------------------------------------

Sorting internal table with variable no of fields

Hi ,
I want to sort the internal table with variable no of fields . Every time the report is run the number of fields as well as the sequence by which the table has to be sorted changes . How to do this .
regards

Hi,
Please try this.
DATA: BEGIN OF ITAB OCCURS 0,
        F1(4),
      END OF ITAB.
DATA: BEGIN OF ITAB2 OCCURS 0,
        F1(1),
        F2(1),
        F3(4),
      END OF ITAB2.
ITAB-F1 = '01AC'.
APPEND ITAB.
ITAB-F1 = '02AB'.
APPEND ITAB.
ITAB-F1 = '01CD'.
APPEND ITAB.
ITAB-F1 = '02CA'.
APPEND ITAB.
LOOP AT ITAB.
ITAB2-F1 = ITAB-F1+2(1).
ITAB2-F2 = ITAB-F1+3(1).
ITAB2-F3 = ITAB-F1.
APPEND ITAB2.
ENDLOOP.
SORT ITAB2 BY F1 ASCENDING
              F2 DESCENDING.
LOOP AT ITAB2.
WRITE: / ITAB2-F3.
ENDLOOP.
REWARD POINTS IF HELPFUL

Duty Cycle

how to generate a waveform with the duty cycle?
Pls reply soon
Thanks,
Jinal

Hi Jinal,
Look in the examples folder, there is a function generator example with a square wave function that allows you to change the duty cycle.
labview\examples\measure\maxmpl.llb - Function Waveform Generator.vi
ssk

Analog signal duty cycle incorrect

I am using an NI PCIe 6535 board to send digital timing signals to a custom PCB.
The signals are digital square wave signals with various duty cycles and phase shifts.
I also need to send a 12 bit ramp signal to the board.
I am having issues with the frequency.
I need the timing signals to run at 833.33333 khz.
I need the lsb of the ramp to run at 416.666666khz.
To create the timing signals I am using "Create Analog signal", so that I can set up the square wave with the appropriate phase shift and duty cycle.
Then I conver from analog to digital.
I am using a DAQmx generate to output the signal to the PCB. I have noticed that the DAQmx gen frequency directly controls the ramps frequency.
However for the digital timing signals there is some scaling factor. The frequency of the digital timing signals can be set in the timing signals them selves. The sample rate in the analog signal also effects the frequency.
To get the frequencies that I need. I had to set the"create analog signal" sample rate at 2.778G S/s, the "create analog signal" frequency to 1.2889GHZ, and the DAQmx generate frequency to 1.66666 MHZ. At those numbers, I get the timing signals to output at 833.333KHZ and the second bit of the ramp at 416.6666HZ (for the ramp I upped it to 13 bit and I don't use bit 0, as it outputs at 833KHZ).
However at these settings all of my timing signals have the same phase, and the same duty cycle, even though I have them set differently.
Can someone please help? I think the issue is that I have the sample rate and frequency of the "create analog signal" block set too high, but if I set them lower my signals will not be at the right frequency.
Attachments:
timing signal 1.JPG ‏44 KB
timing signal 2.JPG ‏47 KB
daqmx gen.JPG ‏55 KB

Hi David,
We found that there seems to be a weird divider between the sampling rate of the analog signal module, the analog signal sample rate, and the f daqmx gen.
After various tests we made a chart of what we observed. Fsignal and sample rate are values set in the "create analog signal" module, Fdaqmxgen is set in the "DAQmx generate" module. We used a "create anaolg signal" module to create the square wave, then convert analog to digital convert the square wave to digital.
We have "repeated signal" and "N periods" checked.
Fsignal
Fdaqmxgen
Sample rate
Frequency measured on the scope
1GHZ
10MHZ
100G s/s
100KHz
100MHZ
10MHZ
100G s/s
10KHZ
1GHZ
1MHZ
100G s/s
10KHZ
10GHZ
10MHZ
100G s/s
1MHZ
100GHZ
10MHZ
100G s/s
10MHZ
100GHZ
10MHZ
100G s/s
5MHZ
The equation we came up with is Feff = (Fsginal/FDaqmxgen)*1000.
To meaure the frequencies were using an HP 54600A oscilloscope, and probing standoff pins on our custom pcb.
We have several versions of the project, attached is the latest one.
Kyle,
How do I set the compression to false?
The picture below looks like labview? We are using signal express.
I can't change the frequency on the DAQ mx gen because I need the ramp to run at a set frequency.
There is a divider between the daqmx gen and the f signal. I have to set the Fsginal in the GHZ to get it to out at the right frequency. The equation we came up with is Feff = (Fsginal/FDaqmxgen)*1000.
Thanks,
Devin

Duty cycle value & user prompt

1. Duty cycle
The value input in the front panel works fine up to 34%, but then it fails for any value above 35%.
(for input value 35% and above, instrument shows 0.5% instead..for all values..)
How can I fix this to make it between 0-100%???
2. User Prompt for config file
Currently, config file will be loaded via "Load Config" case, but is it possible to kick this off when the main VI starts?
The idea is to force a user to load config file to synchronize between the instrument display and the LV front panel.
(when every time the program gets kicked off)
Does anyone have an idea how to do this?
Thanks,
Attachments:
Pulse Channel with Load and Save_no event_v09.4.2.llb ‏2689 KB

I am still having a trouble with setting duty cycle value above 35%...
Tried to add timebase mode subVI in the application function VI, but the outcome is still the same.
Plz help on this...
Attachments:
HP8133A Application Function_mod2.vi ‏129 KB
Pulse Channel with Load and Save_no event_v09.4.3.vi ‏580 KB
HP8133A Ex-Div Timebase_mod.vi ‏48 KB

Duty cycle analysis of multiple channel

I have multiple accelerometer with a duty cycle output (acceleration proportionnal to duty cycle). How can I wire these sensors to the DAQPad 6052E ?

Hi Math,
You will probably get more responses if you post this question to the Data Acquisition list.
When you do so, please provide more info regarding the nature of the signal,
how often you want to acquire it,
and what you want to do with the data.
If you give us enough info, we can answer anything (provided there is funding in place).
Ben
Ben Rayner
I am currently active on.. MainStream Preppers
Rayner's Ridge is under construction

Bad Duty Cycle readings

Hello!
I’m building an application in which I want to measure a duty cycle. I can control the “Duty Cycle In” and the FCM analyzes the info and sends a signal to the Motor. I want to measure the “Duty Cycle Out” of the motor. (I attached diagram) For this measurement I just connected a wire to the negative side of the motor. To calculate this Duty Cycle I am measuring the period and the pulse width. The program works very good when I have a “Duty Cycle Out” from 1% to 99%, but whenever is 0 or 100% it shows wrong info. I would expect that the pulse width at 0% or 100% is cero, but LabVIEW shows a value (1,1E-5 s) and calculates a Duty Cycle of about 23% which is totally wrong. Also, if I run the program for the first time and I measure this pulse width with a “Duty Cycle In” of 0%, pulse width is cero., but whenever I change the “Duty Cycle In” to 10% or higher, and then I go back to a “Duty Cycle In” of 0% it shows a value, and calculates a bad Duty Cycle. I don’t know why this only happens when I put higher “Duty Cycles In”, and then I go back to 0%. I measured the signal with an oscilloscope and there is nothing, not even noise! I don’t know how the card gets these lectures. Do you have any suggestions of what can be wrong?
Appreciated!
Solved!
Go to Solution.
Attachments:
Diagram.JPG ‏33 KB

Hi Elmar
Thanks for the reply. I attached my Code. I am measuring the period with ctr0 and pulse width with ctr1. I divide Pulse Width / Period to obtain the Duty Cycle. To detect 0% and 100% I compare the value of pulse width to zero. I created an additional Digital Input, with this channel I check if the signal is high or low. So if Pulse Width is zero, I read from the Digital Input the level of the signal, and then I know whether is 100% or 0%. My problem is when I have a Duty Cycle of 0 or 100%, the DAQ keeps sending a value for the pulse width, and I cannot apply the method explained before. I think this value should be zero, I don’t know if I am mistaken.
Attachments:
PWM_Measurement.vi ‏61 KB
PWM_Measurement.JPG ‏151 KB

Sine, Square & Sawtooth sweep generation with variable duty cycle/rise time & fall time

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