Electronics > Beginners

Digital Oscilloscope Maximum Input Voltage

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tggzzz:

--- Quote from: mike_mike on January 22, 2018, 11:17:34 am ---I am thinking that I will make a mistake..
For example I have a linear power supply and I want to measure ripple on 2mV/div with 1x probe and AC coupling, and the output of the power supply is 30Vdc.

--- End quote ---

One easy way to make a mistake is to have a *1/*10 switchable probe. Sooner or later the switch will be in the wrong position.

Fortunately that is easy to avoid.

glarsson:

--- Quote from: tggzzz on January 22, 2018, 11:50:28 am ---Fortunately that is easy to avoid.

--- End quote ---
How? My standard probes are *10 but sometimes *1 would be nice. Have not found any *1 probes for sale! Hot glue in the switch doesn't solve all problems as the switch can become flaky.

Zero999:

--- Quote from: glarsson on January 22, 2018, 12:04:46 pm ---
--- Quote from: tggzzz on January 22, 2018, 11:50:28 am ---Fortunately that is easy to avoid.

--- End quote ---
How? My standard probes are *10 but sometimes *1 would be nice. Have not found any *1 probes for sale! Hot glue in the switch doesn't solve all problems as the switch can become flaky.

--- End quote ---
Get a x10 probe without a switch.

--- Quote from: mike_mike on January 22, 2018, 11:13:22 am ---I read a part of the manual and I searched in the manual for some key words, but there is not mentioned the maximum voltage for the 2mV/div input.
--- End quote ---
Yes there is. It's in the screen shot you previously linked to and I explained it above. I repeat the maximum voltage rating is +/-0.4V on settings equal or below 50mV/div. Use a x10 probe if you want to use it on your 30V supply.

glarsson:

--- Quote from: Hero999 on January 22, 2018, 12:18:14 pm ---Get a x10 probe without a switch.

--- End quote ---
How does that help?
I already have plenty of nice and expensive x10 probes without switches. What I don't have is a x1 probe without a switch.

oldway:

--- Quote from: mike_mike on January 22, 2018, 11:17:34 am ---I am thinking that I will make a mistake..
For example I have a linear power supply and I want to measure ripple on 2mV/div with 1x probe and AC coupling, and the output of the power supply is 30Vdc.

--- End quote ---
Why use an oscilloscope to measure the ripple on a linear power supply?

The ripple of a linear power supply is either 50Hz (60Hz) or 100Hz (120Hz), this can easily be measured with a multimeter on the AC range.
Some multimeters can also measure the frequency of the ripple.

With switching power supplies, it is better to use an oscilloscope because the frequency of the ripple is often too high for the multimeter.

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