Measuring High Input Voltages

[mwminor]

HI

I have a requirement to measure a sensor input which lies in the range 0-100V.

The current measuring circuit that I'd like to implement this around is at +/- 12V.

I thought that it may be possible to use some form of opto-isolator but have no experience with these devices.

Can anyone point me in the right direction please...?

MW

 

[duke37]

Please give more information on what you want to do.

Almost any multimeter will be able to measure voltage up to 100V.

 

[mwminor]

The circuit I'm looking at is embedded in an existing instrument and we need to update one of the inputs so that instead of referencing 6-9V (as it does at the moment) we need to use a much higher Voltage.

The OP Amp on the input stage has a supply Voltage of +/- 12V and would really like to re-use as much of the existing stuff as possible.

I thought about using some form of opto-coupler or similar device with an isolated front end, but it something I've not attempted before.

Thanks

 

[BobK]

Do they share a common ground? If so, a voltage divider might be all you need.

Bob