Test and Measurement Forum

voltage limit of 3425

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

voltage limit of 3425

Postby imemotor » Mon Oct 18, 2010 2:16 pm

I know that the spec for the 3425 is 400 volts. but I need to read information on a 480V line. is this possible?
imemotor
Newbie
 
Posts: 0
Joined: Mon Oct 18, 2010 2:06 pm

Re: voltage limit of 3425

Postby ziko » Tue Oct 19, 2010 11:32 am

Unfortunately you will not be able to do this, you would need to really get a normal single ended scope and then use a differential oscilloscope probe designed for high voltages.

Is the 12 bits important? If so then you can buy either the 4224 or the 4424:

http://www.picotech.com/picoscope4000-s ... tions.html

Of if 8 bits resolution is enough you can go for the 2000 range:

http://www.picotech.com/picoscope2200-s ... tions.html

In both cases you will have to use suitable attenuation like the differential oscilloscope probe, like the TA041:

http://accessories.picotech.com/active- ... robes.html

Hope this helps.
Ziko

Technical Specialist
ziko
Zen Master
Zen Master
 
Posts: 1705
Joined: Fri Dec 01, 2006 10:03 am
Location: St Neots

Re: voltage limit of 3425

Postby imemotor » Thu Oct 21, 2010 3:51 am

Thanks for your response, I dont understand why I can not hook up my 3425 to 480v using a TA041?

I would like to connect to three phase 480V to monitor sine wave harmonics
imemotor
Newbie
 
Posts: 0
Joined: Mon Oct 18, 2010 2:06 pm

Re: voltage limit of 3425

Postby ziko » Thu Oct 21, 2010 3:32 pm

Appologies, just checking on the TA041 you can actually use it as its ouput impedance is 10kOhms, whilst the input impedance of the 3425 is 10.1MOhms or 12.4MOhms depending on the voltage range you select. So the low output impedance of the TA041 will not affect the gain.

Now using the TA041 you would have to use the current clamp adapter,TA038, so in this case you would make the scope single ended by connecting the TA038 4mm connector to the channels ground connector. See section 2.4 in the user manual:

http://www.picotech.com/document/pdf/ps3425-en-3.pdf

So to sum up yes you can use the TA041 to do what you want to do with the 3425, however with other probes with high output impedances will affect the gain of your input.

Is there any particular reason you would want the differential scope? As a normal scope with the TA041 would achieve the same thing plus would be able to be used with other probes.

Kind regards
Ziko

Technical Specialist
ziko
Zen Master
Zen Master
 
Posts: 1705
Joined: Fri Dec 01, 2006 10:03 am
Location: St Neots

Re: voltage limit of 3425

Postby imemotor » Thu Oct 21, 2010 8:01 pm

Thanks for your reply. I purchased the 3425 for other reasons, but thought I could use to look at harmonics on a 480V 3 phase line we are having problems with.
imemotor
Newbie
 
Posts: 0
Joined: Mon Oct 18, 2010 2:06 pm


Return to USB PC Oscilloscopes

Who is online

Users browsing this forum: No registered users and 0 guests