Test and Measurement Forum

5244B - Channel A and Channel B not equal

Post any questions you may have about our current range of oscilloscopes

5244B - Channel A and Channel B not equal

Postby Moonwalker » Fri Oct 16, 2015 11:18 pm

I've been measuring a signal from a buck converter and noticed that channel A and channel B are not showing exactly the same signal. Channel B is showing a larger ripple than channel A. See file attached.
Any help?
Attachments
20151017-0002.psdata
(434.29 KiB) Downloaded 57 times
Moonwalker
Newbie
 
Posts: 0
Joined: Tue Feb 11, 2014 6:36 pm

Re: 5244B - Channel A and Channel B not equal

Postby Martyn » Mon Oct 19, 2015 7:22 am

If you swap the probes around do the differences stay with the channel or follow the probe ?
Martyn
Technical Specialist
Martyn
Site Admin
Site Admin
 
Posts: 2344
Joined: Fri Jun 10, 2011 8:15 am
Location: St. Neots

Re: 5244B - Channel A and Channel B not equal

Postby Moonwalker » Mon Oct 19, 2015 10:19 pm

Ohh... sometimes the mind forgets the simple things :)

It looks like it was the probe picking up more signal inductively. After carefully placing the probes close together I get same signal on both channels.

So is it normal for a probe to pick up some signal inductively when connected in circuit?
Moonwalker
Newbie
 
Posts: 0
Joined: Tue Feb 11, 2014 6:36 pm

Re: 5244B - Channel A and Channel B not equal

Postby AndrewA » Fri Oct 23, 2015 2:38 pm

Yes the scope probes can pickup RF if the signal is a high signal level.
The probe must have been picking up the RF from the buck converter itself.
Regards Andrew
Technical Specialist
AndrewA
Zen Master
Zen Master
 
Posts: 178
Joined: Tue Oct 21, 2014 3:07 pm


Return to USB PC Oscilloscopes

Who is online

Users browsing this forum: No registered users and 0 guests