08-23-2019 09:56 AM
Hi, thanks for your attention.
Equipment: NI 6366, function generator EFG 3210, current transducer, voltage transducer and an Inductor.
signal ---- Sine
Voltage ---- 5V
Frequency range --------- 20-2MHz
I want to perform sweep frequency response on an inductor. I need an input current and output voltage from the inductor in labview.
Questions:
1. How do i capture the input and out response in labview including the frequency.
2. Can I make an accurate measurement or perform a correct frequency analysis with the setup attached?
Because i have no control on the signal frequency been generated
3. And is it possible create a frequency analyzer using this Daq mentioned above. If yes how do i go about it.
I look forward to hearing your kind responses.
08-23-2019 02:41 PM
Your signal is being generated by an external Signal Generator. You can set it to a frequency, then use LabVIEW and your DAQ device to record the input (sinusoidal) signal and the output signal from your device.
To accomplish this, you should have familiarity with the following:
Bob Schor
08-23-2019 04:00 PM
In addition to what @Bob_Schor said
Answers:
1. How do i capture the input and out response in LabVIEW including the frequency?
Use the DAQmx API.
2. Can I make an accurate measurement or perform a correct frequency analysis with the setup attached?
Because i have no control on the signal frequency been generated
If properly configured, yes. See points above and @Bob_Schor's message.
3. And is it possible create a frequency analyzer using this DAQ mentioned above. If yes how do i go about it.
Yes, see @Bob_Schor's message
mcduff
08-26-2019 06:52 AM
Thanks for your kind response. Pls how do i go about creating a frequency response analyzer using Labview.
08-26-2019 07:23 AM - edited 08-26-2019 07:29 AM
If you have the sound and vibration vis, you can start with the example Averaged Frequency response (DAQmx)
No generator needed (if the current is below 5mA) 🙂
By adding a known low inductive resistor (1k SMD 😉 or generally another known impedance) and some more math you have all you need.
(Place the resistor (known impedance) between output and DUT,DUT to GND, measure the generator output and the voltage between both impedances).
This has been done for audio frequencies with a soundcard. Browse the web to find the math explained if needed.
Lookup other examples to change the exitation to sine/sweep ....
The tricky parts start if you look closer to parasitic impedances of your setup 😄