dBV in spectrum mode not correct?

 
Post new topic   Reply to topic    Pico Technology Forum Index -> PicoScope R6
Author Message
fredkrom
Active User
Active User


Joined: 02 Dec 2007
Posts: 7
Location: Netherlands
PostPosted: Wed Dec 05, 2007 10:54 am    Post subject: dBV in spectrum mode not correct? Reply with quote
Hi there,

When you are looking to a signal in spectrum mode (also in the demo mode) and measure the top amplitude in dBu, dBV and dBm (50ohm) and check it (I used url http://www.analog.com/Analog_Root/static/techSupport/designTools/interactiveTools/dbconvert/dbconvert.html ) there is always a diverence in the dBV reading. The dBm and dBu are always the same level.

Fred
Back to top
PeterF
Site Admin
Site Admin


Joined: 07 Jun 2007
Posts: 101
Location: Cambridgeshire
PostPosted: Fri Dec 07, 2007 2:01 pm    Post subject: Reply with quote
Hi,
dBm & dBu will only read the same level at a set impedance of 600ohms. dBV should read -2.218 dB lower than dBu but does not in PicoScope6 at the moment, I will be putting in a bug report. Thanks for letting us know.
PeterF.
Back to top
fredkrom
Active User
Active User


Joined: 02 Dec 2007
Posts: 7
Location: Netherlands
PostPosted: Fri Dec 07, 2007 2:54 pm    Post subject: Reply with quote
Thanks for the bug report, will look out for the new version.

At 50 Ohm dBm and dBu will not read out the same numbers, but are the "same level" in volt.

Fred
Back to top
Display posts from previous:   
Post new topic   Reply to topic    Pico Technology Forum Index -> PicoScope R6
All times are GMT
Page 1 of 1

 


Pico Technology topic RSS feed 
Powered by phpBB © 2001, 2005 phpBB Group