开云体育

Well the box turned out a little silly, basically a short from BNC to BNC.
?I setup a series LC 230uh, 110pf (variable) I could not get a dip, (still unsure why, not my first rodeo)
So, I installed a better than 1%, 1Ω resistor as the DUT and used 50kHz to avoid any strays.
Using db on my HP 400E (unknown calibration) Using 1 volt input and 1Ω load, I get -26.45db with the db scale and using a voltage ratio 1/ 0.0371 = 26.95 = 28.6db
?I don't know why the printed scale would not be in agreement.
?The correct answer (according to the paper) is 28.3db, so pretty good agreement using the voltage ratio! The meter error difference is 1.3mv.
?My favorite db to voltage, voltage to db calculator.

? I received parts for another project, so this is now on the back burner, but will keep reading in case someone has ideas where I went wrong.
??????????????????????????????????????????? Thanks, Mikek

* After talking with a calibration facility, I sent my HP 400E in for calibration ($25 shipping) Then they told me, "we can't calibrate that"
?After I get my HP 3400 working properly, I'll check, I think that someone will be able to calibrate that.

>I decided to tighten it up and put the termination at the meter.
? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?? Mikek ???????
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