[SOLVED] how to measure 240v with 10x probe

[pasaajan]

how to measure 240v with 10x probe

 

[FvM]

First you have to check, if the probe's voltage rating allows it. Secondly, the oscilloscope attenuator may be unable to display 680 Vpp. Then a 100x probe is required.

 

[keith1200rs]

The oscilloscope will only see 68V peak to peak with a 10x probe.

Keith

 

[FvM]

The oscilloscope will only see 68V peak to peak with a 10x probe.

Yes. But if it has e.g. 5V/cm as highest range (which is displayed as 50 V/cm, if it has an automatic probe detection) it can't display 680 Vpp.

 

[keith1200rs]

I don't know where this 5V/cm oscilloscope has come from, but I was trying to clarify the statement:

... the oscilloscope attenuator may be unable to display 680 Vpp.

which didn't make sense to me, so possibly not to the original poster either.

Keith.

 

[FvM]

I don't know where this 5V/cm oscilloscope has come from, but I was trying to clarify the statement.

That's good.

To clarify it from my side:
Secondly, the oscilloscope attenuator may be unable to display 68 Vpp respectively 680 Vpp at the probe input. It must have at least a 10 V/cm attenuator position. Many recent oscilloscopes have 5 V/cm as highest voltage range.

 

[dick_freebird]

Why do you insist that a particular, generic probe must be used?
There are HV probes or you could make your own divider. It's not
like 240VAC mains can't stand a few mA of excess loading, which
you could always back out of any data.

 

[Tahmid]

Ok, where do the 680V and 68V come from? Isn't the OP asking for 240V measurement?

 

[alexan_e]

Ok, where do the 680V and 68V come from? Isn't the OP asking for 240V measurement?

The voltage specification is not given, if it is an AC voltage then the p-p voltage will be 680v, if it is a dc then it will be 240v

Alex