Hello Virtins Technology. I'm the Institute IPRAD director in Portugal (Geobiology Portuguese Institute) and i've interest to by a Siglent unite to mesure Dirty Eletricity. Can you make a vídeo showing a simple process of adjustement and mesurement? Thank you so much and congrats for your very good channel. Have a good week.
@@VirtinsTech Thank you for your response.I've see this video with a similar equipament and I've hope that it was identic. ruclips.net/video/lUTRq--3AvU/видео.html
!!! Great video however there is one mistake I noticed, On your digram showing the power receptacle or outlet, you have the Line (L) and Neutral (N) reversed. At lest here in North America, with the Earth or Ground at the bottom, the Neutral is on the left (larger opening) and the Line (smaller opening) is on the right.
The Multi-Instrument software license has a few levels. Please refer to the function allocation among different license levels at www.virtins.com/multi-instrument.shtml. Multi-Instrument Pro supports Bode Plot (called Transfer Function in the software) through two-channel FFT. The test signal generated by the signal generator should be fed into both the DUT and the input Ch. B, and the response from the DUT should be fed into the input Ch. A. This function can also be used as an impedance analyzer if a reference resistor is added. Please refer to Section 3.2.6 of the software manual.
@@VirtinsTech thank you. What I want to do is connect the network analyzer to my LISN, sweep the frequency range 9 kHz - 30 MHz, save the frequency response data and use this curve to apply corrections to measurements taken later using my LISN. Is this doable in the way that you described above? Do I need the pro license for that?
@@dragilla Magnitude frequency response can be measured with single-channel FFT. Once it is done, right click the spectrum analyzer window and select "Generate Frequency Compensation File (Flat)" to output a FCF file. The file can be loaded into the Spectrum Analyzer via [Spectrum Analyzer Processing]>"Intra-Frame Processing">"Compensation 1" or "Compensation 2". The subsequently measured magnitude frequency response will be compensated. The above measurement can be done with the Multi-Instrument standard license
Also, could this oscilloscope/spectrum analyzer be used, to do pre-certification tests of conducted emissions (150kHz to 30MHz), assuming a LISN is used?
The spectrum analyzer window in the video shows the individual harmonic levels. These harmonics will become prominent if the vertical scale is changed from linear to logarithmic. The small windows called DDP (Derived Data Point) viewers can be used to display each individual harmonic level digitally by selecting the respective DDP, e.g. f1RMS_A(EU), f2RMS_A(EU), f3RMS_A(EU), etc. There is actually another window called DDP Array Viewer. It can be used to display a summary table of Harmonic Frequencies, RMS, Phases of up to 100 harmonics.
How does the software display "actual voltage" when you are using a x10 probe? I am new to scopes, but wouldn't 240 volts show as like 24 volts, how does the scope or software see it as the actual voltage when using the x10 probe?
There is a Probe Switch Position selection box in the second toolbar from the top. When a x10 probe is used, select "2", which tells the software to use the second probe attenuation factor configured at [Setting]>[Calibration]>"Probe Calibration Factor". Its default value is 10.
A portable computer is usually floating, so the floating ground differential method can be used, as illustrated by the experiment with a table PC in the video.
Great video! In floating mode would it be enough to connect probe only to "Live" pin and not use channel B? Don't know if my Oscilloscope software supports Channel A-B in Spectrum analyzer mode. Have both Laptop (battery) and USB oscilloscope, with 100x probes. I wish to measure the 220v 50 hz AC mains for "Dirty Electricity" as in spikes in 1 Khz-120 Khz range (Spectrum analyzer mode). Thanks for any insight.
In floating mode, if you only connect one probe tip to "Live", then there will be no direct return path for the electric current except through the parasitic capacitor between the probe ground and the mains ground (see video: 12:50 ~ 13:40) which is not stable.
My computer is running hot with emf's. I checked with the Stetzerizer meter and it shows 1500 on it. Would you know how to lower the computers radiation level?
THD measurement function is usually not available in an ordinary digital oscilloscope. Furthermore, an ordinary oscilloscope is usually only 8-bit. This will limit its ability to measure a devices with a low THD.
Three points to note: (1) Resolution of the FFT: for THD measurement of a 50Hz/60Hz signal, you need a frequency resolution of, say less than 1Hz. (2) Spectral Leakage: Measuring using a cursor on the screen to get the RMS/Amplitude/Power/Energy of a particular frequency component is correct ONLY WHEN the signal is coherently sampled (Please refer to: Coherent Sampling on Wikipedia). This is usually not the case. A window function can reduce spectral leakage but it cannot eliminate it. You can check this by inputting a 2Vpp sinewave to the oscilloscope and see whether you can get 0.707 Vrms in the FFT graph by simply using the cursor to measure on the screen. On the other hand, software can have a good algorithm to get the correct value in FFT results even if spectral leakage is inevitable. (3) Bit depth. It would be difficult for a 8-bit digital oscilloscope to measure THD lower than 1%. So it really depends on what THD measurement accuracy you want.
If this oscilloscope doesn't have a completely isolated power supply and shares a common ground with the USB, then this thing is a piece of garbage. I mean, FFS, a simple magnetically coupled power supply and some isolater IO chips aren't that expensive, ya cheap-ass chinesium designers.
Most oscilloscopes (being standalone or PC based) in the market do not have completely isolated power supply. The connection to protective earth (PE) is required for safety reason. If you really want to do floating measurement, power up your laptop with battery, or simply use an external USB isolator. Having a fixed built-in USB isolator is indeed a very BAD design, because it usually limits the USB communication speed to USB full speed (12M) and loses the flexibility to support both USB full speed and USB high speed (480M). A USB isolator that supports USB high speed is more expensive than the USB oscilloscope here.
literally the only well done computer voice video i've seen
Interesting video. I really enjoyed the explanation of the current return path via the probe's capacitance (13:00)
Excellent demo to measure main power AC!! Two thumbs up video! I cannot believe there are 13 people who dislike?
Hello Virtins Technology. I'm the Institute IPRAD director in Portugal (Geobiology Portuguese Institute) and i've interest to by a Siglent unite to mesure Dirty Eletricity. Can you make a vídeo showing a simple process of adjustement and mesurement? Thank you so much and congrats for your very good channel. Have a good week.
A standalone digital oscilloscope is usually a 8-bit ADC device. It is not able to measure THD with a good accuracy (e.g. lower than 1%).
@@VirtinsTech Thank you for your response.I've see this video with a similar equipament and I've hope that it was identic. ruclips.net/video/lUTRq--3AvU/видео.html
!!! Great video however there is one mistake I noticed, On your digram showing the power receptacle or outlet, you have the Line (L) and Neutral (N) reversed. At lest here in North America, with the Earth or Ground at the bottom, the Neutral is on the left (larger opening) and the Line (smaller opening) is on the right.
Many thanks for highlighting the difference in mains sockets between North America and Singapore / UK.
Can one use your USB oscilloscope as network analyzer, since it has a signal generator built in? I would like to calibrate my LISN.
The Multi-Instrument software license has a few levels. Please refer to the function allocation among different license levels at www.virtins.com/multi-instrument.shtml. Multi-Instrument Pro supports Bode Plot (called Transfer Function in the software) through two-channel FFT. The test signal generated by the signal generator should be fed into both the DUT and the input Ch. B, and the response from the DUT should be fed into the input Ch. A. This function can also be used as an impedance analyzer if a reference resistor is added. Please refer to Section 3.2.6 of the software manual.
@@VirtinsTech thank you. What I want to do is connect the network analyzer to my LISN, sweep the frequency range 9 kHz - 30 MHz, save the frequency response data and use this curve to apply corrections to measurements taken later using my LISN. Is this doable in the way that you described above? Do I need the pro license for that?
@@dragilla Magnitude frequency response can be measured with single-channel FFT. Once it is done, right click the spectrum analyzer window and select "Generate Frequency Compensation File (Flat)" to output a FCF file. The file can be loaded into the Spectrum Analyzer via [Spectrum Analyzer Processing]>"Intra-Frame Processing">"Compensation 1" or "Compensation 2". The subsequently measured magnitude frequency response will be compensated. The above measurement can be done with the Multi-Instrument standard license
@@VirtinsTech Fantastic! Thank you very much.
Which model number of your oscilloscope you use .
VT DSO-2810 was used in the video.
Hi, Can you show each harmonic and its level? I mean both visually and in numbers. Thanks
Also, could this oscilloscope/spectrum analyzer be used, to do pre-certification tests of conducted emissions (150kHz to 30MHz), assuming a LISN is used?
The spectrum analyzer window in the video shows the individual harmonic levels. These harmonics will become prominent if the vertical scale is changed from linear to logarithmic. The small windows called DDP (Derived Data Point) viewers can be used to display each individual harmonic level digitally by selecting the respective DDP, e.g. f1RMS_A(EU), f2RMS_A(EU), f3RMS_A(EU), etc. There is actually another window called DDP Array Viewer. It can be used to display a summary table of Harmonic Frequencies, RMS, Phases of up to 100 harmonics.
yes it can be used in conducted emission test
How does the software display "actual voltage" when you are using a x10 probe? I am new to scopes, but wouldn't 240 volts show as like 24 volts, how does the scope or software see it as the actual voltage when using the x10 probe?
There is a Probe Switch Position selection box in the second toolbar from the top. When a x10 probe is used, select "2", which tells the software to use the second probe attenuation factor configured at [Setting]>[Calibration]>"Probe Calibration Factor". Its default value is 10.
Thanks! I have a question.My computer is portable, no desktop. Are there differences for the measure? Thanks for all .
A portable computer is usually floating, so the floating ground differential method can be used, as illustrated by the experiment with a table PC in the video.
Great video! In floating mode would it be enough to connect probe only to "Live" pin and not use channel B? Don't know if my Oscilloscope software supports Channel A-B in Spectrum analyzer mode.
Have both Laptop (battery) and USB oscilloscope, with 100x probes.
I wish to measure the 220v 50 hz AC mains for "Dirty Electricity" as in spikes in 1 Khz-120 Khz range (Spectrum analyzer mode). Thanks for any insight.
Another question. If i wanted to remove/filter the mains 50 Hz frequency. How to do so? Notch filter, high pass filter, attenuator or something else?
In floating mode, if you only connect one probe tip to "Live", then there will be no direct return path for the electric current except through the parasitic capacitor between the probe ground and the mains ground (see video: 12:50 ~ 13:40) which is not stable.
Thanks a lot. Very informative video.
My computer is running hot with emf's. I checked with the Stetzerizer meter and it shows 1500 on it. Would you know how to lower the computers radiation level?
Turn it off? Your computer is using EMF to function.
@crocket I know..tried and they came out with the cops to put smart meter back on! so pissed. Now 5G is coming...now what?
Hi, thanks for great info. Are this type of measurements available for any type or grounded scope?
THD measurement function is usually not available in an ordinary digital oscilloscope. Furthermore, an ordinary oscilloscope is usually only 8-bit. This will limit its ability to measure a devices with a low THD.
I have : RIGOL DS1054Z, it has some math operations among which FFT,so I can take the values and calculate the THD. What do you think?
thanks!
Three points to note: (1) Resolution of the FFT: for THD measurement of a 50Hz/60Hz signal, you need a frequency resolution of, say less than 1Hz. (2) Spectral Leakage: Measuring using a cursor on the screen to get the RMS/Amplitude/Power/Energy of a particular frequency component is correct ONLY WHEN the signal is coherently sampled (Please refer to: Coherent Sampling on Wikipedia). This is usually not the case. A window function can reduce spectral leakage but it cannot eliminate it. You can check this by inputting a 2Vpp sinewave to the oscilloscope and see whether you can get 0.707 Vrms in the FFT graph by simply using the cursor to measure on the screen. On the other hand, software can have a good algorithm to get the correct value in FFT results even if spectral leakage is inevitable. (3) Bit depth. It would be difficult for a 8-bit digital oscilloscope to measure THD lower than 1%. So it really depends on what THD measurement accuracy you want.
the neutral and line are swapped in the pictures
Thanks, but this is a UK / Singapore power socket, which is different from a US one.
Very nice sir
If this oscilloscope doesn't have a completely isolated power supply and shares a common ground with the USB, then this thing is a piece of garbage. I mean, FFS, a simple magnetically coupled power supply and some isolater IO chips aren't that expensive, ya cheap-ass chinesium designers.
Most oscilloscopes (being standalone or PC based) in the market do not have completely isolated power supply. The connection to protective earth (PE) is required for safety reason. If you really want to do floating measurement, power up your laptop with battery, or simply use an external USB isolator. Having a fixed built-in USB isolator is indeed a very BAD design, because it usually limits the USB communication speed to USB full speed (12M) and loses the flexibility to support both USB full speed and USB high speed (480M). A USB isolator that supports USB high speed is more expensive than the USB oscilloscope here.