# Tag Info

3

It means that (for instance) if you set both A and B input channels to 1V/div, and apply 1V at the specified frequency to channel A, you should not see more than 1% (i.e. 10mV) of that voltage on the other channel (which you probably wouldn't be able to see). It doesn't say whether the other input should be open or short circuit which might affect things - ...

3

I don't understand what meant by channel to channel isolation here "Isolation" means that a signal on channel 1 won't appear on the trace for channel 2 or vice versa. It doesn't mean that the signal input connections for channel 1 and channel 2 are isolated (although on some equipment this may be so). An isolation of 100:1 likely means that a 1 volt signal ...

2

sin(x)/x or sinc is the function of the ideal low pass filter. Your scope has a sharp cutoff at f/2 (at least you are prentending that), and using the ideal low pass filter for interpolation then gives you a result better matching the characteristics of that ideal scope than linear interpolation. Or in short: with sinc, you at least don't see such ...

2

You're basically correct. This is known as the scope's "resolution." For 99.9% digital oscilloscopes, the ADC only looks at the height of the screen and does not go off screen. For this reason, they also don't make measurements on signal data above or below the screen. So, you can take the "full scale" of the screen - the volts-per-division times the number ...

1

In an SMPS on the DC power supply side, Common Mode (CM) noise occurs when current exits the circuit and returns through the ground. Typically a DC supply is not grounded in two places (although it could be) as shown in the circuit above, this creates a ground loop and causes problems. Typically noise exits a device through capacitance and then returns ...

1

Looks like your oscilloscope input is saturating. The input will have a certain range and beyond that you need to add attenuation (as in a x10, x100 etc. probe) or you will get that effect (and can possibly damage the oscilloscope at some point, though most should be protected to a couple hundred volts peak or so). Try a x10 probe (and change the software ...

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