HP4284A Frequency Sweep with frequency points read from a tab delimited excel or lvm file
Hello,
I am using a HP4284A, and have downloaded the file here. However, I cannot figure out what format of file it takes as input: I understand this should be a .lvm tab delineated value file, but in what order is the data? If someone could provide an explanation, or an example data file, I'd greatly appreciate that.
Thanks.
Ps. I know the linked article says that 'The frequency points are as defined for the oscillator in the HP4284A user manual.', bit I have been through the manual from end to end, and I can't find anything of the sort. The closest I've been able to find is the codgin for remote access, but that isn't very relevant as Labview and the coding (C++, I believe) used are very different.
Solved!
Go to Solution.
Sure. I wound up adding some additional features to it, though, badly. It's perfectly functional but badly coded (veteran users please don't laugh); I could probably optimize it now, having learned more, but I'm too lazy to. There's a writeup, too.
Attachments:
HP4284A Frequency and voltage sweep.vi 288 KB
Program writeup.docx 12 KB
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The .lvm file generated by the Write to Measurement File Express VI includes column heading titles for the y values, but they are a default value of "untitled". See attached example of a sample file when opened in Excel, the values in question are highlighted. Is there a way to specify the column titles when the file is written?
This is a similar question to this posting, which received a work around response to use the Write to Spreadsheet File.vi, rather than a solution when using this VI.
Message Edited by Hightop Raven on 05-02-2007 03:37 PM
Attachments:
column_titles.gif 13 KBSorry for the late reply. I was out of the office Friday.
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Thank you
Message was edited by: tdjohnson7700 -
Program to upload data from a tab-delimited file ...
I have to upload data from a tab-delimited file with following fields into database table(ZCBU) with same fields:
CBU (parent)
KUNNR (child)
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SFID (salesforce ID)
AEDAT (effective to)
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plz tell me how to do this in both type of filesHi,
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empno TYPE zmemp-empno,
name TYPE zmemp-first_name,
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Form to get the file path of legacy data stored on presentation server
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'S9002_PLACE'.
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'=SAVE'.
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itab-name.
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itab-last.
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itab-comp.
PERFORM bdc_field USING 'S9002_PLACE'
itab-place.
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'S9001_EMPNO'.
PERFORM bdc_field USING 'BDC_OKCODE'
'=BACK'.
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USING bdcdata
UPDATE 'A'
MODE 'N'.
ENDLOOP.
Start new screen *
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CLEAR bdcdata.
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bdcdata-dynpro = dynpro.
bdcdata-dynbegin = 'X'.
APPEND bdcdata.
ENDFORM. "BDC_DYNPRO
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FORM bdc_field USING fnam fval.
CLEAR bdcdata.
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ENDFORM. "BDC_FIELD
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FORM get_file_path .
CALL FUNCTION 'KD_GET_FILENAME_ON_F4'
CHANGING
file_name = p_file.
ENDFORM. " get_file_path
*& Form get_data
FORM get_data .
DATA : lines1 TYPE i.
MOVE p_file TO xfile.
CALL FUNCTION 'GUI_UPLOAD'
EXPORTING
filename = xfile
filetype = 'ASC'
has_field_separator = 'X'
TABLES
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DESCRIBE TABLE itab LINES lines1.
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Nihar Swain, -
Trouble importing contacts from a tab-delimited file into Contacts on 10.9.5
I am having Trouble importing contacts from a tab-delimited file into Contacts on MacBook Pro, OS 10.9.5, Intel 2.4 GHz Core 2 Duo., 400GB drive, 4GB memory DDR3
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Can anyone offer some advice or tell me what I may be overlooking in this process?
Any help will be greatly appreciated!
Thanks,
<Email Edited By Host>Hi Rammohan,
Thanks for the effort!
But I don't need to use GUI upload because my functionality does not require to fetch data from presentation server.
Moreover, the split command advised by you contains separate fields...f1, f2, f3... and I cannot use it because I have 164 fields. I will have to split into 164 fields and assign the values back to 164 fields in the work area/header line.
Moreover I have about 10 such work areas. so the effort would be ten times the above effort! I want to avoid this! Please help!
I would be very grateful if you could provide an alternative solution.
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Frequency sweep with peak frequency
Hi guys, I need some help here. I´m using a NI 9215 to do a frequency sweep from 30 to 90 Hz.
So far so good. Now I need a resulting resonance frequency at highest voltage.
I tried a max peak frequency VI but couldn´t get it to work.
Any idea what to do?
mfg, Andi
ok, here is my sweep.vi for better understanding
Message Edited by andinew on 08-11-2009 04:14 AM
Attachments:
sweep.vi 216 KB
create_log_frequencies.vi 15 KBHi Andi,
one thought first off: looking at your "create_log_frequencies.vi", I realized that it generates linear frequency hops, not logarithmic ones...
But on to your question: to find the frequency with the highest amplitude (this will be your resonace, I guess), you will have to look at the entire signal - your "sweep.vi" code iterates the measurement and interpretation five times per second, independantly of the speed of the sine sweep.
My advice would be to generate one waveform containing the whole sweep run, and writing this sweep block for block with a constant sample rate onto the output. You could then read back the response with blocks of the same size as your output, do the single tone measurement on this block and store the resulting frequency and amplitude in an array preserved trough a shift register or simply into two auto-indexing tunnels. The latter is okay as you don't need a "while loop" in the measurement loop (you know how long the analog output loop runs - why not use this information to configure a "for loop").
After your analog input "for loop" has finished, search your amplitude array for the maximum - then use the found element's index to index the frequencies array and return the corresponding resonance frequency.
A good starting point could be the example I wrote a couple of month ago: it runs continuously the same "sweep" (you'd have to adjust the waveform, I know) and reads back the stimulus and the response (wire the output to your probe and parallely to ai0, your response signal will be connected to ai1). You can then insert tone measurements etc. at the marked section...
When trying to open the example, you will be prompted to find a VI called "_Get Terminal Name....vi" - you can find this VI at the following location: C:\Programme\National Instruments\LabVIEW 8.5\examples\DAQmx\_Utility\_Utility.llb
As an afterthought: the "phase difference" you are calculating between every other sample of the analog measurement array is a bit confusing: if oyu need the phase difference between the original signal and the stimulus response, you will need to wire the stimulus to a second input and compare the phases of the two separate signals...
Best regards,
Sebastian
Message Edited by SFK on 08-12-2009 04:12 PM
Attachments:
Multi-Function-Synch AI-AO mit Signalgeneration.vi 91 KB -
I'm using the Simulation Loop on LV RT when interacting with some hardware (i.e. all I/O is happening in the Sim loop). I'm going to conduct a frequency sweep test on the hardware and want to use the Simulation Chirp function. However, there is no way (that I can see) to trigger the Chirp to start at some event (i.e. I click a boolean on the front panel and enter a case statement). The Chirp is tied to the global time of the Simulation loop and so are it's input parameters. Is there a way to make it relative to some time at which an event happens?
Craig,
Your solution will 'cut' the beginning of the signal and only show the signal afterwards.
To control when the chirp should start, the best option is to use the Chirp Pattern.vi ( in the Signal Generation palette) and use a Lookup table to control when to feed the time. The shipping example (in LabVIEW 2013) shows how to code using a lookup table.
C:\Program Files (x86)\National Instruments\LabVIEW 2013\examples\Control and Simulation\Simulation\Signal Generation\SimEx Chirp.vi
Then, to start from a toggled boolean, look at the example:
C:\Program Files (x86)\National Instruments\LabVIEW 2013\examples\Control and Simulation\Simulation\Signal Generation\SimEx Step.vi
and Here is the example in 2013 (in attachment):
Barp - Control and Simulation Group - LabVIEW R&D - National Instruments
Attachments:
SimEx Chirp with Delay.vi 241 KB -
Reading in a tab delimited file
I have the following table in oracle 9i:
arc_book
arc_id, arc_title, arc_publisher, arc_release_date
And a tab delimited file called smc_book. Here is how the smc_book tab delimited file looks like:
smc_id smc_title smc_publisher smc_release_date
1234 "Beautiful Wonder" "Wrox Books" 1/1/1999
2356 "Master PL/SQL" "OReilly Media" 6/5/2004
5432 "Harry Potter and Goblet of Fire" "Simon & Shuster" 2/4/2001
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I would really appreciate it if someone could help me out.
Thanks
Robertwell you can use sql loader utility to load the data in your file in some temp table and use that temp table as a base for your comparisons,
other way around is to use external tables
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http://www.orafaq.com/faqloadr.htm
http://www.oreilly.com/catalog/orsqlloader/chapter/ch01.html
external tables
http://download-east.oracle.com/docs/cd/B19306_01/server.102/b14200/statements_7002.htm#i2153251 -
The following is the setup :
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there was a property node for the polymorphic VI (!) , I could easily
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Having started the frequency generation at a default value, I would
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Any suggestions welcome.
Thanks
Raghunathan
Raghunathan
LV2012 to Automate Hydraulic Test rigs.Hello SG_ENGINEER,
So that is possible, but it is a completely different approach than that mentioned above. You would have to use a continuous analog output program and change the output waveform. Check out the attached example. I modified a shipping example to do an analog output and increment the frequency of the output waveform.
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Continuous_Analog_Out_Update_Sinewave.vi 100 KB -
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hello! i hope you can help me with my problem
im using:
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Continuous_Analog_Out_Update_Sinewave.vi 100 KB -
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Dear All
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v_blob_len NUMBER;
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v_raw_chunk := dbms_lob.substr(v_blob_data,c_chunk_len,v_position);
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Continuing on from my last question, there was something else I want to ask if you dont mind.
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Lynn -
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I have been struggling with this issue for weeks now and hope someone from this forum can help me out. I am trying to read data from a phmeter via the rs232 of my computer. I am reading using the basic VISA read and write code and have configured my Serial configuration to terminate read at a Line Feed(\n). I am using the code provided in my attachement to parse the data to read only the ph number using the string functions search and replace, etc.
As the phnumber I get displays only for a fraction of a second (when my instrument tranmits data ie every 5 seconds) using just this string function, I have added a case statement to look for strings>0 to display the data (ph number) till the next update. I have shown this in my snippet too. This works fine but I am getting a bunch of 0's on the output array when my case is false.
I have inialized the array with dimension size 0 too and then used the build array function to append all the new data to my existing array using a while loop with shift registers, but the appended array I get has every ph number output with 7 other 0's. I guess the build array function allows 8 element arrays to be formed with every transmision, or maybe the way I am parsing the data is incorrect. I am pretty new to Labview so don't know what I am doing wrong.
Conversely, in order to work around this issue I have tried adding 8 elements of my appended array at a time to see if I can generate one real ph number with every transmission, but don' know how to do this either. I need to get an array of elements with all the different non-zero ph numbers to do a running average and min/max function but have contacted many people who could not help me come up with a suitable solution to this problem.
I am looking forward to all suggestions to make my code work best. I'm sorry I could not attach the entire code as its proprietary information.
Thanks a lot!
Solved!
Go to Solution.
Attachments:
snippet.PNG 31 KBThanks for your suggestions Smercurio and Dennis Knight. How do I configure the VISA read to read only when data is available ie being sent by my instrument? I was looking into the Read Status function but I thought that is for GPIB only. Is there any other case statement I can write to do this efficiently?
Please see the cleaned up version of my code in the attachment. I need to average samples (MEAN)collected every minute, as well as check the min and max values received per minute. Currently the mean includes all the 0 elements I am getting in my array which is why I am trying to get rid of them.
Also with the append array function which was suggested to me by an NI engineer, my ph number in the case statement updates after a significant time lag. This is the other issue I am fighting with. Initially I was not using the appended array as I did not have a need to do the averaging and my code was updating pretty fast.
In the event that the array being put out has the seven 0's by nature, is there a way to add up 8 elements of the appeneded array at a time (since most are 0's) and build another array again. I know this is unnecessary processing if I can just configure the read to read with every data transmission.
Thanks again.. and I look forward to speaking to you and others on this issue.
Attachments:
code for ni chat.vi 98 KB -
Cue points read from asnd files.
hello one and all,
it seems to me that asnd is a good loseless file format for soundbooth, and since that the case, shouldn't flash natively read not only the audio stream from an asnd but also its cue points, since they are also obviously stored in the asnd file also because soundbooth stores and retrieves that information from the asnd. i mean it would be good from embedded audio within flash and a lot easier then exporting to flv or xml.
can't this feature be built into cs5?
thanx, lucasUse File IO>>Advanced File Functions>>Set File Position.vi from the functions palette to set the position of the file as required.
I am curious as to why you would want to read the file multiple times; If the data in the file is not changing, it is more efficient for you to read it once.
Also, there is no device called a DAQ. DAQ drivers (NI-DAQmx is the latest version) are used to run a variety of data acquisition devices. Whether you can output your waveform at your required resolution and speed depends on what kind of data acquisition device you have. Regarding your question about data format, most boards accept data in a variety of forms. Even if your particular form is not supported, conversion is pretty easy. We need more details about the format of your data and the type of device you have to better answer this question.
S G
Certified LabVIEW Architect, Certified TestStand Developer, Certified Professional Instructor
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