Differential Scope Probe/Adapter

[Zero Cool]

Anyone have any suggestions for an affordable Differential Scope probe or adapter box? Looking for something that can handle not only audio bandwidth but up to 100mhz preferable and 1mv to 100vrms input.

 

[rayma]

This company has a variety of active differential voltage probes.
However, most such probes are not intended for very small voltages.
You may have to get one probe for small voltages, and another probe for large voltages.
Cal Test Electronics - Homepage

There are quite a few used active differential voltage probes on ebay.
https://www.ebay.com/sch/i.html?_fr...leDesc=0&_osacat=0&_odkw=active+voltage+probe

This used Tek is pretty a good deal for mV levels if it works, and has a 0.1x range.
Tektronix ADA400A Differential Preamplifier | eBay

 

[Audio1Man]

Hello Zero
An inexpensive way to get DIFFERENTIAL PROBE is by using a DUAL CHANNEL SCOPE in ADD MODE and two matching probes. This will give you plenty of audio bandwidth. 100Mhz will be many more $$
Duke

 

[as_audio]

.. and one channel inverted, right ?

 

[Audio1Man]

Yes 1 Channel inverted.

 

[Linearojg1976]

Apologies for jumping on someone else's thread my oscilloscope skills are not strong. When using both probes for the differential mode do the grounds get connected to each other or where do they go?

(In add mode)

 

[1audio]

The recommended practice is to tie the grounds to each other but not to the DUT. Use a separate cable to ground the reference point of the DUT to your scope. See page 2-12 of http://w140.com/smb/7a22_sm.pdf for a more complete discussion.

 

[Linearojg1976]

Very informative and useful. I need to get out of the habit of looking for recent reference material. Not much that hasn't been published already, I'm not breaking new ground.

Cheers Demian