Measuring large voltages on CRO

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p.gholap93

Member

• Jul 31, 2011

• #1

My CRO has volt/div max of 20V/div. With this I can measure maximum of 80V peak value. But I want to measure 240V peak value AC signal as well as 240V DC signal. So can I achieve this with CRO? Can I use external triggering for the same?

 

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Diver300

Well-Known Member

Most Helpful Member

• Jul 31, 2011

• #2

With a 10:1 or 100:1 oscilloscope probe that should work fine.

 

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p.gholap93

Member

• Jul 31, 2011

• #3

You mean to say that I should have the special probe? Not some settings of CRO?(Like I was thinking of external trigerring)

 

Nigel Goodwin

Super Moderator

Most Helpful Member

• Jul 31, 2011

• #4

p.gholap93 said:

You mean to say that I should have the special probe? Not some settings of CRO?(Like I was thinking of external trigerring)

Click to expand...

No, you need a x10 probe - but this is pretty standard anyway, with most probes being switchable x1/x10.

So a x10 probe will give 200V/div with your scope set to 20V/div - plus it increases input impedance to 10Meg, and decreases capacitance by a factor of ten.

 

Reloadron

Well-Known Member

Most Helpful Member

• Jul 31, 2011

• #5

Read this link. Then do a simple Google of X10 Oscilloscope Probes and pick your poison. You need a X10 probe to appreciate the scope.

Ron

 

Last edited: Jul 31, 2011