Subject: Re: Wideband gain measurement
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Date: Wed, 09 Oct 2002 14:48:08 GMT
NNTP-Posting-Date: Wed, 09 Oct 2002 16:48:08 MET DST
"John Woodgate" schrieb im Newsbeitrag
> I read in sci.electronics.design that Ban wrote
> (in ) about 'Wideband gain
> measurement', on Wed, 9 Oct 2002:
> >you can greatly increase the accuracy with a precision adjustable
> >and your scope as a display.
> > generator>input amp>Channel1
> > output amp>attenuator>Channel2
> >now adjust the generator that the amp is in a linear region without
> >overload, high enough out of the noise and hits a horizontal line(90%) on
> >the screen.
> Before you go on, disconnect the amplifier and attenuator from the scope
> and connect the generator, at the output level setting you have just
> found, to BOTH channel 1 and Channel 2. Adjust the channel gain controls
> until the two traces exactly co-incide. You have thus eliminated any
> error due to channel gain difference from your measurement.
> Then re-connect the amplifier and attenuator to channel 2 and go on to:
> >set the attenuator course to-30dB and adjust the fine scale until both
> >traces are of equal height. Write down the value, it corresponds to the
> >of your amp.
> Regards, John Woodgate, OOO - Own Opinions Only.
John, thanks for this excellent extension!