Electronics > Beginners

Digital Oscilloscope Maximum Input Voltage

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mike_mike:
I have found that if I let the oscilloscope powered on for a few minutes, the offset between the trace and the CH1 mark is getting lower and lower. Is that normal ?

Damianos:
Yes! All instruments have a "warm-up time", to become in the "normal conditions", where they are calibrated...
You can find that information in the specifications section of the manual.

radiolistener:

--- Quote from: zvonex66x on January 21, 2018, 06:01:59 pm ---Maximum input voltage is 300V no metter if you set scale for 10V/div or 10mV/div...

--- End quote ---

I suspect that if you put 300V 500 MHz, the input will be burned out like a match  :)

Some time ago, I asked Siglent support what is amplitude limit for high frequency for 1M input of their oscilloscope. I asked for 100 MHz frequency. They give me answer 40 Vpk.  :)

400 V is supported through 10x probe. 400 / 10 = 40  ;)

I think 40 Vpk at 100 MHz is too much, I don't believe it can handle it with no damage. So, I don't want to test it  :-BROKE  :phew:

tggzzz:

--- Quote from: radiolistener on September 08, 2019, 12:51:16 pm ---
--- Quote from: zvonex66x on January 21, 2018, 06:01:59 pm ---Maximum input voltage is 300V no metter if you set scale for 10V/div or 10mV/div...

--- End quote ---

I suspect that if you put 300V 500 MHz, the input will be burned out like a match  :)

Some time ago, I asked Siglent support what is amplitude limit for high frequency for 1M input of their oscilloscope. I asked for 100 MHz frequency. They give me answer 40 Vpk.  :)

400 V is supported through 10x probe. 400 / 10 = 40  ;)

I think 40 Vpk at 100 MHz is too much, I don't believe it can handle it with no damage. So, I don't want to test it  :-BROKE  :phew:

--- End quote ---

Now look at the derating spec for the probe.

15pF at 100MHz is 100ohms. 400V into 100ohms means 4A is flowing :)

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