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dBV in spectrum mode not correct?

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dBV in spectrum mode not correct?

Postby fredkrom » Wed Dec 05, 2007 10:54 am

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/stati ... nvert.html ) there is always a diverence in the dBV reading. The dBm and dBu are always the same level.

Fred
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Postby PeterF » Fri Dec 07, 2007 2:01 pm

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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Postby fredkrom » Fri Dec 07, 2007 2:54 pm

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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