Fluke 284 Arbitrary Waveform Generator Phase Lock Channel Synchronization
I am using Fluke 284 Arbitrary Waveform generator (not NI instrument). I am trying to make use of LabVIEW to assign channel 1 as the master and the other three as slaves to phase lock the slaves and change precisely the phase offset with respect to the master.
The error explanation that I received was:
Possible reason(s):
Error -1074000000 occurred at Fluke 28x Series.lvlib:Error Query.vi
Instrument reports:Inter channel lock not possible. Refer to manual for more details.
Complete call chain:
Fluke 28x Series.lvlib:Error Query.vi
Fluke 28x Series.lvlib:Configure
I would like to know of there is any other block that I need to add to control the output of the master and the input of the slave. I have referred to chapter 13 of the users manual which I have also attached.
Attachments:
Fluke 284 Manual.pdf 1890 KB
Fluke_Block_Diagram.png 130 KB
Don't know what the problem is, but the error number is strange. It's not a standard error for Windows, LV or the instrument in question...
Mike...
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Hi!
I have got 33522A Function / Arbitrary Waveform Generator, 30 MHz. I want to produce two squarewave signal of 30 KHz, one on each channel. Trick is the wave form should be mirror image. I problem is, wondering if those signal is sysncronise if i drive it via LabView.
Solved!
Go to Solution.I have played around with one of these in the past, and these signals should be synchronized without any special commands.
This can be done on the front panel of the device or via LabVIEW. The simplest way to set these is make the channel parameters identical except for amplitude, make the amplitude of one output the negative of the other output.
One thing to be aware of ...
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Thank you!!
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Go to Solution.You must combine your individual data into an array. The digital waveform is simply a digital representation of the binary array. It still boils down to bit 0 of each array element going to channel 0 (or the first channel you specify in Create Dynamic Channels). The next bit goes to the next channel. My last post is quite clear. To display the array in binary, right click on an array element, then select Display Format, then select Binary. You can also right click on the element, select Visible, then select Show Radix to display the small b before the number. One more thing, in the Display Format window, uncheck the box next to Use minimum field width. Then set the numeric just under the box to 8. Then select Pad with zeros on left in the box below.
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Attachments:
awg.JPG 95 KBHi,
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Does anyone know how to add AWGN to a carrier generated using NI RFSG ?
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For context, I've pasted in the "explain error" output from LabVIEW to refer to while we work on this. More after the code...
Error -200290 occurred at an unidentified location
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By default, the analog output on the device does what is called regeneration. Basically, if we're outputting a repeating waveform, we can simply fill the buffer once and the DAQ device will reuse the samples, reducing load on the system. What appears to be happening is that the VI can't read samples out from the file fast enough to keep up with the DAQ card. The DAQ card is set to NOT allow regeneration, so once it empties the buffer, it stops the task since there aren't any new samples available yet.
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Definitely not a feasible option for your application, so we'll just skip that one.
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I'm 99.99999999% sure you're already using DMA, so we'll skip this one also.
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I think our best bet is to increase the "Samples to Write" quantity (to increase the minimum loop period), and possibly to delay the DAQmx Start Task and consumer loop until the producer loop has had a chance to build the queue up a little. That should reduce the chance that the DAQmx task will empty the system buffer and ensure that we can prime the queue with a large quantity of samples. The consumer loop will wait for elements to become available in the queue, so I have a feeling that the file read may be what is slowing the program down. Once the queue empties, we'll see the DAQmx error surface again. The only real solution is to load the file to memory farther ahead of time.
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Phase Locking the Up and Down Converter Modules
I am interested in phase locking the 5660 and 5670 modules, but from what I understand...this might not exactly be possible.
Using the 10MHz references...it seems that I can frequency lock the two together (i.e. - I can eliminate any phase error due to the two LO's drifting away from each other). However...am I correct in assuming that there is no way to actually access the individual oscillators such that I can remove the phase difference between them?
For example...if I want to measure the phase added by a DUT....I would have to measure the phase without the DUT...then meausre the phase with the DUT...then look at the relative difference in the two phase measurements (as calculated from the IQ samples). However, if I were to repeat this measurement by first measuring the phase without the DUT....then turn the generator off...then back on again....then measure the phase with the DUT...I'd expect to get a different answer, since by turning the device on and off, I have no idea or control over the phase relationship between the two devices.
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Finally...does simply connecting say, the 10MHz Out of the upconverter, to the Freq Ref IN of the downconverter automatically frequency lock the two together...or do I have to go into LabView and programatically tell the things which reference to use?
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Hey guys,
I am new to LabView and my final year project depends on it! Please help as much as you can!
I am trying to output an arbitrary waveform on an oscilliscope. The shape of the waveform depends on user input parameters like no. of samples, amplitude of each sample and the frequency of desired waveform. Please refer to attached Arbitrary_Wave_Display.vi. In the attached vi, the desired waveform is displayed on the front panel. My project requires that I output this waveform through the analogue output channels of the 2 DAQ2005 cards that I have. When I connect the output of th Arbitrary_Wave.vi to the input of the AO write express vi, there is no output of the oscilliscope. I believe it should be connection problems with regards to while loops and loop conditions. I have also attached my attempted vi.
Please feel free to give some advice. It is greatly appreciated,
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TheApprentice of LabViewYou didn't attach any VI and what is the DAQ 2005? I don't know of any NI board with that model number. The analog output functions on the LabVIEW DAQ palette only work with NI boards.
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Great discrepancies of frequencies of the arbitrary waveform using niFGEN 5401
Hi all!
I'm using niFGEN PCI 5401 to generate an arbitrary waveform defined previously in the Soft Front Panel.
The reference guide says, that I can produce a frequency up to 1 MHz. Does this value refer to the whole waveform or to each sample of the 16384 samples? And how can you explain, that at last the arbitrary waveform takes about 600 ms for one cycle even though the frequency was set to 1 MHz?!
Thanks in advance
SteffiHi Jerry!
I generally understood how DDS works, but I'm bemused why the output frequencies do not correspond to the input frequencies?
1.) Yesterday I made a test with the GIVEN Soft Front Panel and even this does not work as it should: If I want a standard square function of 1 MHz, I get a square function of 2,5 Hz! (The same with 100 kHz = 0,25 Hz and 10 kHz = 0,025 Hz.) Where does this factor come from?
2.) This factor also corresponds more or less to the generated arbitrary function in my program: with 1 MHz I get 1,6 Hz, with 100 kHz = 0,16 Hz ...
3.) I thought changing the ratio between pulse length and length of the whole signal period (it's first a square and then a long time zero) I could generate a short pulse anyway accepting the mentioned f
requency discrepancies. E.g.: One period takes 600 ms (although my input frequency is 1 MHz). If I have a ration of 1 (square) to 100 (whole signal) I should get at least a pulse of 6 ms. But the shortest pulse I ever got was about 20 ms.
The IMPORTANT QUESTION: is there a physical limit for generating pulses (e.g. due to the inertia of the DDS method)?
I hope I could explain my problem more precisely. Thank you anyway!
Steffi -
Hi!
I am wondering there is any mechanism in Labview to sysnthesis some waveform and play it with 33522B Waveform Generator.
Solved!
Go to Solution.I believe the drivers have VIs that allow one to load an arbitrary wavefrom to the instrument. You should be able to modulate it either with an external input to the device or internally. Is that what you are looking for, otherwise, your question is unclear to me.
Cheers,
mcduff -
I've attached a vi to start with a vibration profile. This is something new to me so "please" bare with me..
The idea is to get the inverse fft of the profile and input it to a voltage wfm generator (Hardware Input & Output - DAQmx - Voltage - <one of the wfm generator examples>). In the attached vi, can I just wire the psd output after the for loop to inverse fft vi? and how can I go from there to connect its signal to waveform generator input?
Thanks in advance..
KowdTek
LabVIEW 2009
One Step At A Time, Maybe Two...
Attachments:
Trial.vi 15 KBKowdTek,
To do the Inverse FFT, you can simply use the attached VI. I have also used a Build Waveform function to give you your waveform. This particular waveform starts at 0 (default), and has a time step of 0.1 seconds. To output this, use one of the examples, but replace the waveform generation subVI with your waveform. You will probably also need to change the DAQmx Write VI to Analog » Single Channel » Multiple Samples » Waveform.
Hope this gets you started!
Drew T.
NIC AE Specialist
Attachments:
Trial.vi 20 KB -
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Hi,
I would like to generate 1000 packets with 1000 different datas using RF 5670. can we do this using the script triggering. please let me know how can we dynamically update this trasmitted data.
Thanks and RegardsTake a look at this little example I wrote. It's kind of off the cuff but should give you an idea of what you can do. Notice that it is meant to go in the "update" case structure that you saw in Multiple Arbitrary Waveforms.vi. I'm assuming that you have some sort of algorithm that creates your 1000 waveforms. I've named them all by just the number 1, 2...etc. You'll place them in an array of strings and then use that to create the script with the Concatenate Strings.vi. I've only created a script (called 1000waves) using 2 of the dynamically created waveforms so you would want to use some sort of looping to create a script of 1000 waveforms.
Obviously you do have to stop generation and then start again while you're creating and updating the new script so the longer this takes the longer you won't be generating. Just be aware of that.
Hope this helps!
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Attachments:
script.vi 66 KB
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