PXI-4461 frequency sweep.

Hi,
I'm writing a sweep function for PXI-4461 to measure frequency response. I fixed the number of samples of sine wave as 100 and the sampling frequency is varied by ten times the output frequency. The Input and Output channels clock rates are changed on the fly according to the output frequency. However, I found that the PXI-4461 is needed to stop the task before changing the clock rate, am I right? Therefore, the output signal from 4461 become on and off repeatedly due to the task start/stop. I want the signal generated continuously, any suggestions?
Bill

If you are using LabVIEW, you could try the swept sine in the Sound and Vibration Toolkit. It uses a constant sample rate and update rate and changes the generated frequency on the fly. There are no glitches in the output.
Doug
NI Sound and Vibration

Similar Messages

Can I produce a frequency sweep a PXI-5652 from 1GHz to 2GHz and back down to 1GHz at a rate of 1KHz with RT?

I need to produce a triangular frequency sweep over a range of at least 1GHz. This sweep will start at 1GHz go up to 2GHz and back down to 1GHz and repeat the cycle. I need this cycle to repeat at a rate of 1KHz. The sweep must be as smooth as possible with the frequency steps being no more than say 1MHz. I have a RT controller chassis that I can install the PXI-5652 into. If I dedicate one of the processor cores to this function and reserve the second core for my data acquisition and processing do I have and chance or am I just dreaming?
Thanks,
Bruce Barnes

Hi Bruce,
If I interpret this correctly that you need to go from 1 GHz to 2 GHz and back to 1 GHz in 1 ms (you want to repeat this at a rate of 1 kHz) then this isn't possible with the PXI-565x series of RF Signal Generators. These have a tuning time of around 1-5 ms for one frequency step, and tuning from 1 G to 2 G in steps no greater than 1 MHz would mean at least 1000 steps.
Regards,
Andy Hinde
National Instruments

Noisy signal when using PXI 4461 DC Voltage

Hi
I'm conducting shot noise measurements on single molecule junctions. In order to bias the sample with a very clean DC bias, we've purchased the NI PXI-4461 for our lab. According to the specifications, the output noise should be in a order of 23*10^-6V for a bandwidth of 80kHz. However, when testing the V output by connecting it to a spectrum analyzer (SR780) at V=0 DC bias and differential output mode (To generate the DC signal, I've simply used the test panels.), the output spectra was very noisy (x units are Hz y units are Vrms/sqrt(Hz)):
So we've discovered the output is actually very noisy and especially has a high peak at ~53kHz, probably from the AC power supply. Connecting a 10Hz low pass filter significantly improved the result:
Which shows that the output noise filters of the 4461 are probably not activated. Also the peak at 50kHz from the power supply still remains very substantial (later, we've managed to reduce it further by disconnecting the ground of the output). According the the specifications of the 4461, it should be possible to get a very clean DC signal from it:
"NI 4461 output channels have both analog and digital anti-imaging filters. These filters remove the unwanted out-of-band components generated when an analog signal is produced from digital data. The digital filters limit the bandwidth of the output signal to half the original conversion rate, thereby rejecting images caused by the 8-times oversampling process. The signals generated by the analog output circuitry are low-distortion, low-noise, flat-frequency analog signals."
So my questions are:
1. How can I make these anti imaging filters work using labview? (code examples will be great)
2. Are there is any other configuration parameters of the PXI-4461 which can be used to lower the output noise?
3. How can I reduce the power supply noise? (regarding this - we also have a computer PXIe-8106 running on the same PXI chassis)
Sincerely,
Ran Vardimon

Hello Ran,
It sounds like your main issue is filtering the output noise from your DSA card and you're trying to find a proprty to activate the anti-aliasing filters. There is a DAQmx channel property node that can filter that noise, and is described in the KnowledgeBase article here. The article covers the AI property, but you can use the class browser to find the AO version as in the attached picture. Hopefully this helps.
Jake H | Applications Engineer | National Instruments
Attachments:
Class Browser.png ‏25 KB

PXI-4461 Onboard device memory underflow

I am using a PXI-4461 to generate an aquire a singal. When i generate the signal i get error -200621( onboard device memory underflow) onDAQmx Stop VI. I donot understand what the error means.
Signal Information
Signal Type=Sine Wave
Frequency=3K
amplitude=0.3V
Sampling Rate=48K
Number of samples sent=48000 or 1sec
I have tried reducing my sample rate to 20000 but that didnot help much. How do i get rid of this error
I have attached an picture of my vi below
Thanks. Any help whould be much appreciated.
CS
Solved!
Go to Solution.
Attachments:
Code Image.png ‏82 KB

Welcome and thank you for using the Discussion Forums! This error is most likely due to the non-regeneration property you have set. What's happening is that LabVIEW generates your two sine waves continuously, but slower than the update rate of the DAQ card, so the buffer gets empty before it can write enough samples to the buffer so that the 4461 can keep generating the voltage values on the channel.
What you could do is simply set the Regeneration mode to "Allow Regeneration". I tried the non-regeneration and regeneration property on the "Voltage - Continuous Output.vi" and it works with regeneration enabled.
Regards,
Daniel REDS
RF Systems Engineer
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PXI 4461 simultaneously read and generate

I am using PXI 4461 card, which has 2 inputs and 2 outputs.
I have a sequence, which will be loaded for multi UUT testing at the same time. I am trying to use AI0, AI1 to read the signals, which are generated by UUTs at the same time. One UUT can measure signal at AI0 and other UUT should measure AI1.
I was in impression that it can be possible to measure both AI0 and AI1 at the same time. But it's giving the error, when I try to measure.
I made the attached VI as an reentrant. Please let me know if this is possible.
I would like to know same if this is possible to generate from AO0, AO1 at the same time with different frequencies (1KHz, 10KHz). AO0 should generate signal with 1KHz and AO1 should generated signal with 10KHz. Is this possible?
Thanks,
Attachments:
4461.vi ‏17 KB

LV2010,
Thank you for using the forums!
First off, I ran your VI as is with one AI. I received the following error:
The message is letting you know you have your MIN set higher than your MAX. Basically, your max value is currently set to -10 and your min value is set to 10. Switch those, and you eliminate the error.
In order to read from both ai0 and ai1, you can simply put them both in the control window:
This is called channel expansion.
In order to see the waveforms, I added a Waveform Graph to my front panel and then on the block diagram I wired it to the data output of the DAQmx read.
The DAQmx Read VI will read the channels in the order in which you specify in the Physical Channels terminal.
In terms of generating two outputs from AO0 and AO1 at the same time, that is definitely something you can do! I have attached the final VI, but this is how I did it...
First, I opened the example finder by going to Help >> Find Examples. On the bottom left, I selected the PXI-4461 and marked the box next to where it says "Limit results to hardware". Navigating to Hardware Input and Output >> DAQmx >> Analog Generation >> Voltage, I opened the example "Cont Gen Voltage Wfm-Int Clk-Non Regeneration.vi".
Taking a look, this will allow us to generate one waveform at one frequency. First off, I know I want to output two different waveforms with separate information. I selected the relevant indicators and controls, then pressed Ctrl+C and dragged it over to create a copy. I changed labels and moved stop button to make it more appealing, and changed the waveform information.
Then, I moved to the block diagram. I placed a new Function Generator.vi and moved/wired the controls/indicators I created above to the inputs/outputs of the new function. I changed the error wire to go through the new Function Generator.vi before going into the DAQmx write. Lastly, I connected the sampling information from the first function generator to the new one.
Next, we need to change the write function. It is currently set up to write an along waveform with 1 channel and N samples. We want N channels and N samples. Change the DAQmx write to Analog >> Multiple Channels >> Multiple Samples >> 1D Waveform. By doing so, it creates an broken wire between the output of the one function generator.vi that is still wired to the input of the DAQmx write vi.
The reason for this is that the DAQmx write with N channels and N samples expects an array of waveforms, not a single waveform. I deleted this wire and placed a Build Array (Programming >> Arrays >> Build Array). I dragged it down to expand it to hold two waveforms, one for ao1 and one for ao0.
The order that you wire the two waveforms into the array will determine which waveform is output on which channel. The first waveform in the array will be output first. We will put the first function generator output to the first row of the Build Array function and the second to the bottom row. Then wire the output of the Build Array function into the DAQmx write.
The block diagram now looks like this:
All that is left is left is to specify what channels we want. We will again use channel expansion. Remember, the first waveform we wired into our array will be the first output, and the first in the list of the control will be the channel output first.
The front panel now looks like this:
And we are done! I have attached the final version of this VI as well as the edited version of the VI you posted.
I know this was long, but I hope it was helpful!
Also, here is an article and here is an example from our community forums you may find helpful.
The attached Code is provided As Is. It has not been tested or validated as a product, for use in a deployed application or system, or for use in hazardous environments. You assume all risks for use of the Code and use of the Code is subject to the Sample Code License Terms which can be found at: http://ni.com/samplecodelicense
Katie
Katie Collette
National Instruments
Attachments:
Edited-Cont Gen Voltage Wfm-Int Clk-Non Regeneration.vi ‏38 KB
Edited 4461.vi ‏22 KB

When using the LabVIEW Simulation Module, how can I start a frequency sweep with the Simulation Chirp signal generation VI at an arbitrary time after the simulation initial time?

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

Frequency sweep input output

Hi
Using Labview 7.1 and PCI 6071 DAQmx card i want to design a frequency sweep application. I mean that i need my analogue output channel to give a sine wave with incremental frequency of 100 Hz step, starting from 10000 Hz untli 100000 Hz (10000 Hz, 10100 Hz...100000 Hz). This wave is applied on a kind of a transformer, and each time the frequency changes, i need an input channel to acquire another also sinus wave coming from this transformer and measure its amplitude, in order to examine its frequency response. So, i came up with the attached vi.
The problem is, that when "sweeping" takes place ,i get amplitude values between 2 and 6 or even 7 volts something that can't be happening. I know that the amplitude values i should get are around 2 volts (+/- 500 mV maximum).
I think, that the problem should be in some kind of "non-synchronization" of the input-output channels when the vi enters the loop to start changing the frequency.
Just to be more clear, i need my vi to do these steps in order:1. constantly output the 10000 Hz wave 2. acquire the input wave 3. measure its amplitude 4.transform the frequency into 10100 Hz 5. acquire the input wave 6. measure amplitude etc...
The odd thing is that when i physically connected the output channel with the input one to see if the frequency sweep is done, it worked fine. I mean that i did get in the input channel almost exactly the signal i generated.
Thanks in advance, and i hope i was not tiringly analytical..
Attachments:
sweep3.vi ‏140 KB

Hi
Please take a glance at the two attached vi's.
The first is the one i use in order to generate a steady frequency sinus wave,feed it to my transformer and acquire the also sinus output of the transformer through my input channel. Using two channels of an external oscilloscope i check and notice that for many frequency values, both sinus waves are steady and noiseless, with the expected amplitude voltages.
Now, using the second vi, in order to "sweep" the wave and check my transformers amplitude response, then these impossible amplitude "up's and down's" again came up.Again by looking at the oscilloscope's screen i can see the noisy waves tha "confuse" and the oscilloscope and my input channel, and so result in wrong amplitudes.
Based on the above, i have to assume, that the problem lies in the sweep mechanism design i use. Also, after trying several different ways to sweep, i came to the conclusion, that the problem comes up whenever i use the second Basic Function Generator.vi inside the loop. Could it be that it needs triggering again?
I'd really use some help, or maybe even ideas for different design approaches for the frequency sweep.
Thanks in advance
Attachments:
Multi-Function-Synch AI-AO3.vi ‏164 KB
sweep4.vi ‏142 KB

How to measure the directivity of microphone by pxi-4461

i want to measure the directivity of microphone, but how can i do it by pxi-4461 ? i have a standard microphone, an under test microphone and pxi-4461? can you give me some ideas? thanks

ok， follow is my ideas:
1、the fixed source is generated by the port AO0 of 4461
2、the signal via power amplifier to transmitting transducer(device under test),
3、the transmitting transducer is placed on a turntable(0-360°)
4、the signal receive by standard microphone, and access into AI1 of 4461
if the above true, i just need to record the sound level(Sound Level.Vi) in different angle, and polt it by Poalr Plot.vi?
thanks again

Reading and frequency sweep on agilent 4980a

Hi all.
I newbie on Labview myself but always using this forum to answer all the problem that i had.
Currently I work at compression measurement and do the measurement of load cell and impedance at the same time. I use labview command that included when installing driver.
My problem is that I need to utilize agilent 4980a to read the impedance value on 1K and force value on load cell while probe is moving to compress the spesimen (I reach this step) but I need to add program to stop the probe and execute frequency sweep (and store it in additional file) without terminating the program it self to continue on each point I desire. When i see example program on agilent 4980a, Program to start frequency sweep is different and it's quite confuse me.
Is that any way to inserting frequency command on loop in labview?
I upload my flowchart.
THANK YOU SO MUCH
Ananta
Attachments:
2014-06-26 15_00_15-_Diagram1.dia (D__portable apps_DiaPortable_Data) - diaw.exe.png ‏39 KB

Ananta,
For most instrument control applications, you can replicate commands as you would enter them on the instrument. So if you can perform this frequency sweep in the middle of a test on the instrument itself, you should be able to send serial commands from LabVIEW to mimic this behavior. Once it has been established this task is possible, I would recommend combining parts of the instrument driver examples to try to attain this functionality.
Karl G.
Applications Engineer
ni.com/support

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 KB

Hi 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

Error during self calibration - PXI-4461

We are running Calibration Executive 3.2. We are using a PXI chassis and controller and trying to calibrate a PXI-4461 card.
In running the procedure, we received the following error during Self Calibration:
Error 200718 occurred at DAQmx Self Calibration.VI at step self calibrate.
Any guidance in resolving this issue would be appreciated.
Richard

Here is the info from the calibration report. I can email you a PDF of the report and also a screen capture of the error message which states: "Measurement taken during calibration produced an invalid AI gain calibration constant. If performing an external calibration, ensure that the reference voltage passed to the calibration VI or function is correct. Repeat the calibration. If the error persists, conatct National Instruments Technical Support.
CALIBRATION PERFORMANCE TEST DATA
DUT Information
Type: PXI-4461
Tracking Number: 33367
Serial Number: 33367
Notes
Customer Information
Name: Cal Lab
Address:
Purchase Order:
Notes
Environmental Conditions
Temperature: 23.0 C
Humidity: 13.0 %
Operator Information
Operator Name: administrator
Calibration Date: Friday, March 23, 2007
16:27:03
Notes: Error or termination
occurred. This calibration
may not be valid. Error
code: -200718 Error
message: Error -200718
occurred at DAQmx Self
Calibrate.vi at step Self
Calibrate Possible
reason(s): Measurement
taken during calibration
produced an inval
PXI-4461 Serial Number: 33367
Friday, March 23, 2007 16:27:03 Page 1 of 2
Standards used during Calibration
Type Tracking Number Calibration Due Date Notes
Fluke 5500A Multifunction
Calibrator
32261 3/15/2008
DMM 32260 11/21/2007
33250A 29536 10/13/2007
Calibration Results
Test Canceled
Calibration As Found As Left
Test Value Low Limit Reading High Limit PassFail Low Limit Reading High Limit PassFail
N/A N/A N/A N/A N/A N/A N/A N/A N/A
PXI-4461 Serial Number: 33367
Friday, March 23, 2007 16:27:03 Page 2 of 2

PXI-4461 Filter Delay

Hi,
I have some questions about the Filter Delays associated with the PCI or PXI-4461 card.
I do not have this card, but am interested in it, especially the 24-bit analog output function, to control a test apparatus I have. The problem I face now is that the test apparatus and sensors are sensitive enough to see each bit change in the 16-bit resolution analog control voltage I now use to control the apparatus. I like the sensitivity of my equipment, but do not like seeing the bit changes in the control signal in the resulting data.
I am concerned about how the Filter Delays inherent in the 4461 operation, the roughly 3 milli second delays from instructing the 4461 to output (or input) a signal, and that output signal actually responding (as I understand what the Filter Delay is), will affect the ability of that card being effectively used as an instrument control signal. I do not want milli second delays interrupting the otherwise smooth control of the test apparatus. I am interested in learning about what triggers a filter delay so it can be avoided if possible.
For example, I might generate an analog output signal to control my test apparatus that consists of several monotonically increasing linear voltage ramps with different slopes, each voltage ramp slope representing a different sliding velocity for the servo mechanism in my test machine to follow.
I could do this by calculating each ramp separately and join them together to make one lengthy voltage ramp / waveform where voltage changes as a function of time vary within the longer waveform. That longer waveform is fed to the DAC to play back at a constant clock rate. Besides the initial start-up of the DAC, I don’t think that there there would be any filtering delays in that example, would there?
However, I do control the machine on the fly so to speak, where changes in the control voltage ramp occurs at arbitrary times without stopping the program, calculations for each DAC update are done right before it’s sent to the DAC. Would each DAC change in this case trigger a filter delay?
Another option to generate a machine control signal is to generate a simple voltage ramp that starts at -10V and ends at +10V that has 16,777,216 values, one for each of the 24-bits. As the program runs, the clock rate is varied which causes the DAC to generate bit changes at different rates, which varies the rate the voltage output changes with time. Will each chang of the clock rate trigger a filter delay?
I realize that there are other ways to increase the resolution of an analog output using 2 or more 12 and/or 16-bit analog outputs, but they too have their limitations. It would be nice to simply have a high resolution analog DAC without the added external hardware and added programming complications associated with the multi DAC output ‘solutions’.
Any comments regarding the 4461 cards and how they might behave under these scenarios, or suggestions for alternative hardware/software to get a finer DAC output resolution would be appreciated.
thanks,
Brian

Briank:
The filter delay in an analog output is dependent on the sampling rate that you choose. If the 3-4 ms delay is too much for your application, you can sample at a faster rate. For example, if you sample anywhere between 102.4 - 204..8 kS/s, your delay is 32 samples. This corresponds to a delay of 0.1563 to 0.3125 ms. Do these numbers seem more reasonable for your application?
The filter delay happens regardless, it is not triggered. Let's take a filter delay of 1 ms for example. From the time the data is transferred onto the card, there is a 1 ms delay as it propagates through the DAC. There is a constant lag time when using any output channel.
Changing the clock rate during run-time is not supported, the better way to do this would be to sample at the highest rate possible and create an array of data that has multiple samples of the same value to emulate a lower sample rate. This gives you the benefit of having the shortest filter delay time (0.3 ms).
Nathan M.
Applications Engineer
National Instruments

PXI-4461 input protection?

Hi,
Is there any specification for the PXI-4461 input protection? I can not find any mention of it in the datasheet.
By misstake I connected an input to 60VDC and to my surprise it survived

Hi Janaf
From the manual the PXI-4461 Analog Input looks like this:
Input Overvoltage Protection
Differential configuration ............... ±42.4 Vpk
Pseudodifferential configuration
Positive terminal......................... ±42.4 Vpk
Negative terminal (shield) .......... ±10.0 Vpk
Best Regards
David
NISW

Low Amplitude Signal on PXI-4461

I am curently using two PXI's to output an analog signal through LabVIEW 2009 to an oscilloscope:
PXI-4461 is running the attachment (labeled appropriately) below. It also produces the green line on the graph. It appears correct on the oscilloscope.
PXI-5412 is running the other attachment (labeled appropriately) below. It produces the yellow line on the graph. This amplitude is measured correctly (or so it shows in the margin of the picture), however it gives me a "Low Signal Amplitude" warning and displays the wave much smaller than the "correct" version from the 4461.
*Note: I suppose it is possible that the PXI-4461 (green) is wrong and the PXI-5412 (yellow) is right, but since the PXI-5412 (yellow) produces the error, i am lead to believe that it is the problem.
I could use some help figuring out what might be causing this inconsistency and how might I go about remedying this issue.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
If someone helped you out, please select their post as the solution and/or give them Kudos!
Solved!
Go to Solution.
Attachments:
PXI-4461 Function Generator.vi ‏87 KB
PXI-5412 Function Generator.vi ‏23 KB

This has nothing to do with LabVIEW. It is all oscilloscope related. The reason the yellow signal is smaller than the green is because your scales are different. Look at the bottom of your oscilloscpe: Ch2 says "500mV per division" while channel 3 says "1V per division". You probably get a "low signal amplitude" because you signal is less than "2 divisions" and the scope sugests you to change this. There should be a button named "Autoscale" on your scope which you can hit if you want.

Differential inputs or pseudodifferential PXI-4461 inputs

I am wondering aboout the pseudodifferential an differential inputs of the PXI-4461
I am doing measurements on switch mode amplifiers where the outputs are bridged and not really ground (PGND) referenced. The input is ground (AGND) referenced to a 5V section. Due to switching currents, AGND and PGND can fluctuate relative each other.
I understand that the pseudo-differential inputs means the inputs are decoupled from ground and therefore suitable for common mode noise reduction. Differential are fully differential per input.
Is there any performance (accuracy) downside to the fully differential mode, compared to pseudo-differential?
How are maximum voltages specified for fully differential mode (max voltage relative to ground)?
Can I use one input channel of the PXI-4461 in differential mode, one in fully differential?
Thanks

I believe the information in this link would be helpful: Pseudodifferential versus Differential Input Configurations

PXI-4461 frequency sweep.

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