[Elecraft] [K3] KXV3A fails 1 mW calibration

[Pierfrancesco Caci]

Ok, I'm a step further now. I did the manual calibration as described in
the manual. Now the automatic one only fails on 50 MHz. I'm now going to
check with the miniVNA if the dummy load is indeed 50 ohm at 50 MHz,
just in case.




>>>>> "Don" == Don Wilhelm <w3fpr at embarqmail.com> writes:


    Don> Even if the scope has a 1 Mohm input, it has considerable capacitance,
    Don> so yes, you need a 10X probe.
    Don> is needed to display the proper amplitude of an RF voltage.



    Don> 73,
    Don> Don W3FPR

    Don> On 2/12/2012 1:52 PM, Pierfrancesco Caci wrote:
    >> Thanks for this info. Now, please pardon my total ignorance in using
    >> these instrument. If the scope has an input impedance of 1 Mohm, do I
    >> still need to use the probe, or can I just use the BNC T ? I have the 50
    >> ohm dummy on the other side of the T of course.
    >> With the scope directly connected, I read slightly over 600 mV peak to
    >> peak. Should be almost there, right?
    >> 
    >> Pf
    >> 

-- 
Pierfrancesco Caci, ik5pvx