Gerard,
This is a really basic question about electronics. The folks on the Agilent group probably didn't know where to start.
I suggest you do a google search for these three terms:
Resistance.
Reactance.
Impedance.
Resistance is what you get with an ideal resistor.
Reactance is what you get with an ideal capacitor or an ideal inductor.
Impedance is a mixture of resistance and reactance. Whatever
the particular circuit happens to have.
When they say your Keysight has 50 ohms *impedance*, they mean that AT THE FREQUENCIES OF INTEREST, its input looks more or less like a 50 ohm resistor. So if I feed it with an ideal generator with a 50 ohm resistor in series, by voltage divider action, you will see exactly half the generator voltage at the Keysight input. But generators are often specified as "50 ohm output impedance". The ideal generator part is buried inside, and you can't get to it. Generally, in order for the output voltage to be what you asked for on the front panel, you need to terminate the generator's 50 ohm output with a 50 ohm load.
- Jerry KF6VB
toggle quoted message
Show quoted text
On 2021-06-09 12:20, Gerard wrote:
Hello,
I am sorry to ask the question here, but I have not yet received a
specific answer on the subject on the agilent group.
My question is simple: When we say that an analyzer has a input RF of
50 ohms, what does that mean?
I don't think it's so simple.....
I take an ohmeter on the input RF N, what i have to get?? 50 ohms,
infinity, or something other?
you may see my topic here:
[email protected] | Hp8558b spectral analyzer
(2/2) [1]
I'm stuck on my diagnosis
cdt
Links:
------
[1]
/g/HP-Agilent-Keysight-equipment/topic/hp8558b_spectral_analyzer/83405508?p=,,,20,0,0,0::recentpostdate%2Fsticky,,,20,2,0,83405508
[2] /g/BITX20/message/89065
[3] /mt/83428634/243852
[4] /g/BITX20/post
[5] /g/BITX20/editsub/243852
[6] /g/BITX20/leave/10189903/243852/952924773/xyzzy
