|
|
| Author |
Message |
Willyham
Guest
|
 Posted: Wed Mar 28, 2007 6:40 pm Post subject: Measuring Current |
 |
|
Using a PicoScope 3204 I'm finding it difficult to get a good looking current measurement. Because the default mode is volts I've tried creating a custom range. The result is almost a perfect rectangular shape which appears to be overvoltage (warning icon appears). I have tried inputting the table so that the ranges are beyond the signal's voltage input range but still the result appears over-voltage.
Any possible solutions?  |
|
| Back to top |
|
 |
alan
Site Admin
Joined: 25 May 2006
Posts: 45
|
| Posted: Thu Mar 29, 2007 6:30 am Post subject: |
|
|
Hi,
Please can you give us details of the current clamp or dropping resistor you are using to measure current (ie is the output 1mV per amp)?
Next its best to do a reality check and just display the waveform on the scope using a normal voltage range.
Please then post the details of the scaling you are using - for example if the scaling should be 1mV per amp and you want to measure 0 to 100A the the scaling would be
0 0
100 100
If you also want negative current (-100A to 100A) then use
-100 100
0 0
100 100
Regards
Alan |
|
| Back to top |
|
|
Willyham
Guest
|
| Posted: Fri Mar 30, 2007 7:34 pm Post subject: |
|
|
| Looks like I was using V to A scaling when should have been using the mV to A scaling. That fixed the problem. Thanks ! |
|
| Back to top |
|
|
Carl Grotti
Guru
Joined: 21 Nov 2002
Posts: 50
Location: Missouri, USA
|
| Posted: Sun Apr 01, 2007 5:19 pm Post subject: |
|
|
For clarification, I think Alan meant the -100A to 100A range should look like this provided your high current probe is outputting 1mV/AMP.
-100 -100
100 100
Regards,
Carl |
|
| Back to top |
|
|
alan
Site Admin
Joined: 25 May 2006
Posts: 45
|
| Posted: Mon Apr 02, 2007 9:51 am Post subject: |
|
|
Thanks Carl! I am obviously not qualified yet to help on the Forum!
Alan |
|
| Back to top |
|
|
Carl Grotti
Guru
Joined: 21 Nov 2002
Posts: 50
Location: Missouri, USA
|
| Posted: Tue Apr 03, 2007 1:46 am Post subject: |
|
|
You're welcome, Alan.
Hey, don't cut yourself short. You're doing a good job helping others. I just happen to know ranging very well and thought it would be a good idea to make sure our users have it right. I personally would like to see this same ranging in PS 6, but I understand the justification in that it helps avoiding an entry that is wrong.
Once again, you're doing ok Alan. It is easy to make a typo. 
Best Regards,
Carl |
|
| Back to top |
|
|
|
Cart
Email