dBV in spectrum mode not correct?

 
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fredkrom
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Joined: 02 Dec 2007
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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
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PeterF
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Joined: 07 Jun 2007
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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.
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fredkrom
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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
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