Hi. In oscilloscope world people talk a lot about bandwidth of 1:1 probe is about 10MHz - and you are doing 40MHz measurement. And also the proper probe compensation by tuning the variable capacitor at the probe - not done at all. Could you please address these 2 questions for this measurement ?
The Probe can be set up on a scope with a square wave 1Khz signal and adjust till the signal looks best and sharp on the probe. At higher frequencies around 40 Mhz it still should be close because you matched it on a sharp edge of the square wave. Some signal generators vary and so do leads. Some leads can work to 100 Mhz and others higher than that. These leads are surely calibrated and are very high quality to do these kinds of tests. I can see what you mean about the probe compensation but these probes are impedance matched and probably software calibrated on a test set. Kinda how scopes have a self calibration function
In Bode-Measurements (Transfer Function Measurements), sine-wave signals are used and the frequency response of the probes can easily be checked / corrected. This is not so easily possible in time-domain measurements.
With a frequency response analyzer it is much simpler to correct for the probe frequency response. Either via software correction or by manually tuning the probe until a flat 0dB / 0° line is achieved. If this is not possible, software correction is always possible.
Really nice thank you for the great video. Reflected signals aways trick my brain hehe. I always think: they really exist or are only a superposition way of thinking ?
Of course they exist! The reflection is used to perform e.g. TDR measurements (see ruclips.net/video/Il_eju4D_TM/видео.html). If you apply continuous sine-wave signals to a reflecting cable then of course the reflected waves and the exciting waves will mix up and you will not see it so clearly.
@@OMICRONLabTutorials Yes, this is what I'm talking about! In steady state with continuous sine signal we could think of the reflected wave much more like in the sense of power factor in power electronics. The only thing a load can do to a steady signal is change the voltage and current phase relation. In TDR of course we have a case of practical reflected waves making more sense with the mathematical model.
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caps gave a gain magnitude alright.
Hi. In oscilloscope world people talk a lot about bandwidth of 1:1 probe is about 10MHz - and you are doing 40MHz measurement. And also the proper probe compensation by tuning the variable capacitor at the probe - not done at all. Could you please address these 2 questions for this measurement ?
The Probe can be set up on a scope with a square wave 1Khz signal and adjust till the signal looks best and sharp on the probe. At higher frequencies around 40 Mhz it still should be close because you matched it on a sharp edge of the square wave. Some signal generators vary and so do leads. Some leads can work to 100 Mhz and others higher than that. These leads are surely calibrated and are very high quality to do these kinds of tests. I can see what you mean about the probe compensation but these probes are impedance matched and probably software calibrated on a test set. Kinda how scopes have a self calibration function
In Bode-Measurements (Transfer Function Measurements), sine-wave signals are used and the frequency response of the probes can easily be checked / corrected. This is not so easily possible in time-domain measurements.
With a frequency response analyzer it is much simpler to correct for the probe frequency response. Either via software correction or by manually tuning the probe until a flat 0dB / 0° line is achieved. If this is not possible, software correction is always possible.
Thanks for making a great video. Really helpful information.
Really nice thank you for the great video. Reflected signals aways trick my brain hehe. I always think: they really exist or are only a superposition way of thinking ?
Of course they exist! The reflection is used to perform e.g. TDR measurements (see ruclips.net/video/Il_eju4D_TM/видео.html). If you apply continuous sine-wave signals to a reflecting cable then of course the reflected waves and the exciting waves will mix up and you will not see it so clearly.
@@OMICRONLabTutorials Yes, this is what I'm talking about! In steady state with continuous sine signal we could think of the reflected wave much more like in the sense of power factor in power electronics. The only thing a load can do to a steady signal is change the voltage and current phase relation. In TDR of course we have a case of practical reflected waves making more sense with the mathematical model.
@@AllElectronicsChannel absolutely... Then you can even use reflection factor or impedance for simple calculations. ;-)