Test and Measurement Forum

How to control vertical range of Spectral Mode?

Forum for discussing PicoScope version 6 (non-automotive version)

How to control vertical range of Spectral Mode?

Postby talktronics » Sat Jun 28, 2014 3:14 am

I've been using 5244B for performance measurements of an amplifier used for position controller. Looking at the noise levels, in Spectral Mode, there are situations where the baseline of the spectral plot (x-axis) is chopped off. There does not seem to be a way to set the vertical axis range from min to max in order to see the baseline. Possibly this is a resolution problem, maybe the signal falls below the noise floor of instrument. But the behaviour seems inconsistent. See attached print that shows what I mean. Is there a way to control the vertical range displayed in spectral mode?
Attachments
PicoScope 5244B spectral display anomaly 6-27-14.pdf
screen shot showing bottom chopped off
(94.59 KiB) Downloaded 81 times
talktronics
Newbie
 
Posts: 0
Joined: Sat Jun 21, 2014 12:19 am

Re: How to control vertical range of Spectral Mode?

Postby alan » Sun Jun 29, 2014 6:22 am

As its just off the screen try dragging up the left hand axis with the mouse to reveal more. Another option is to click on the x1 icon at the bottom left, from this you can set a zoom of say 0.9 to reveal more.

If that does not work, let us know and we will find another solution.
alan
Site Admin
Site Admin
 
Posts: 179
Joined: Thu May 25, 2006 8:02 am

Re: How to control vertical range of Spectral Mode?

Postby michael.clarage » Fri Jul 28, 2017 4:41 pm

spectrum cut off.png
The UI cuts off the spectrum. Scaling and offsetting does not change anything.
I was hoping there was a response to this. I have the same problem. Picoscope-6

UI cuts off the spectra
spectrum cut off.png
The UI cuts off the spectrum. Scaling and offsetting does not change anything.


Exporting the spectrum data shows the full range
spectrum not cut off in exported data.png
Exported data is complete
michael.clarage
Newbie
 
Posts: 0
Joined: Sun Feb 26, 2017 12:57 am

Re: How to control vertical range of Spectral Mode?

Postby Gerry » Tue Aug 01, 2017 2:22 pm

Hi michael.clarage,

Could you post a psdata file so that we can accurately quantify the signal levels in both views to determine if this is an issue.

Hi talktronics,

I have had some difficulty reproducing what you are seeing in 5000 series PicoScopes. Have you had a chance to follow Alans suggestions, to verify if you still have an issue?

Regards,

Gerry
Gerry
Technical Specialist
Gerry
PICO STAFF
PICO STAFF
 
Posts: 152
Joined: Mon Aug 11, 2014 11:14 am

Re: How to control vertical range of Spectral Mode?

Postby talktronics » Tue Aug 01, 2017 3:52 pm

As Michael pointed out, scaling, etc. does not change the situation.
talktronics
Newbie
 
Posts: 0
Joined: Sat Jun 21, 2014 12:19 am

Re: How to control vertical range of Spectral Mode?

Postby Gerry » Thu Aug 03, 2017 9:02 am

Hi talktronics,

Scaling doesn't change the situation for Michael, but I needed to know if it changed the situation for you, because now that i know that it doesn't I can ask you to post a psdata file so that we can try and replicate what you are seeing. The issue is that this problem doesn't appear to be easily reproduced, on different 5000 series PicoScopes.

Regards,

Gerry
Gerry
Technical Specialist
Gerry
PICO STAFF
PICO STAFF
 
Posts: 152
Joined: Mon Aug 11, 2014 11:14 am


Return to PicoScope 6 for Windows

Who is online

Users browsing this forum: No registered users and 0 guests