HP 8753E - Page 108

14. To set the CW frequency before going into the power sweep mode, press:
./.::: :,.v . . . . . .
,. ; _ ; _ . . . . .
g) ::~~~~~~~~~~~ ~~~~:~~~
. .
15.
~ .,., :,,,, ,,
Press LMenu) ~~~~~~~~~~ gaw,,;:; $* ..
i.:.
16. Enter the start and stop power levels for the sweep.
Now channel 1 is displaying a gain compression curve. (Do not pay attention to channel 2
at this time.)
17. ‘lb maintain the calibration for the CW frequency, press:
_
a ~:~~~~~~~6
: ::..‘;..
K ;~~~.~~~.. mif
:;,; ;;,:=; ‘j .yj:,;;; ;:: iy : “;;,J ~ .i ::
./ ..A.. z<<<... ..I . . . . . . .:.... :.::.: . . . . . . :...: .:... . ...:<.. . ..<... . . . . .:.. ..~....
18. Rress cmJ (j-1 ~~~~:~~~~~.~~~ :~~~:..~~~~,~~~;
::::./ . . . . . ..s.>>>..: .A.. .w;> .::.. ii /.::::: .::. .::: . . . . . ~.~.T.~...S.> . . . . .:..v; . . . . . . . 0 . . . . . . . . . . . . . . . . ...//.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . i ;./........ SWAS // S..% .,.,.,., L . . . . . . . . . _.:.:
_
,,...,.,.,.,.,.,.,.,.,.,.,,.,.,.,.,.,. /,;.. ,,,.. ./ ,..,..,... ,..; . . . .
19. If ,~~~~~~~ :&;i&@ was sele&ed, press k&$$ ~~~~~~.. ~~~~~~~,~~~~~:
i.ii...i . . . . ,.,...... .:.s. L,i,i .,,, ..: _; ,.... .;:::.
*
/ _ _~ .,., / * / .,. _
L....?...... ,, * :::.. . . . . . .::. :::. .:::::.:
.._
20- Press m ::~l!Jl%E;.,,~Q&~fi;~ a.
,. ,...
_., *
Now channel 2 displays absolute output power (in dDm) as a function of power input.
: ,,,, ,, /,.,. :.:.:.:.:.:.:.:.:.:.::.:...:~:::::....::::::::::.::..:::::::.::. ..I
21. Press (scalef) :2X$@il$$f~~~,’ Llo) Ixl) to change the scale of channel 2 to 10 dR per division.
.: :.::::: :..: ::.:
22. Press @iii) @ Ixl) to change the scale of channel 1 to 1 dB per division.
Note
A receiver calibration will improve the accuracy of this measurement. Refer to
Chapter 5, “Optimizmg Measurement Results.”
/ *,.,.;I........./; :...w ,....,..A .,w; ,...........,, .,.,.,....:.:.:.:.:.:, :::::::. :.::. :.:.:.:: :..: .:. :::::.:;: ; :: ‘:,~,.,~,~. ,~~.~;,‘,,,. :<..: J . . . . . .,.,,,;. /.... / ,.,. ,A..
,. _ i .,..,...,. _ .,./,..
23. press cm) ~~~~~~~~~~ ‘~~~~~~~~.
..,. ..,,; ..,.:. .,.,.: .._. i.................,. _.... .::::: ..A .,......A.i . . ..A. .A.. .A.>.... .A.. .v;..:.. .A.. c.....z;;.... . . .>..: ,.... .:......... s... .A...%.......;; . . . . . . . . . . . . i . . . . . . . . . Li ..i . . . :.. ..:.:.,. ::.:..::::::
24. lb hnd the 1 dB compression point on channel 1, press:
. ...::::::;.; (_ .:::. ..:< <::.. ‘”
“‘:,:,.,.,.,.,.,. .,.,.,.,.,.,.,.,.,.,. _ _
,,, ,, ,.
cm- ~~:,~~~~: ~~~~~.
::::. :::.. ::::.. :: i
..-.......-..... .._...........
LMarkerJ ~~~~~:~:,::...~~~:...::
.’ .~~~~~
_.,., .,._; _.. _.; __ ._ . . . . . . . . . ,....... ._. ..:. _ /
., / __.,.,.,.,.,.,.,.,.,.,..... / . . . . . . . . . . .
(j-j) ~,~~~~~ ~~~~~~~~; L-11 Lxl]
._......_,..........” _......_......_. ,..._.; . . . . . . . . . . . . . . . . . ..~......~ . . ..A .*;:........;..:: . . ..A . ..I. :..:. !T . . . . . . . :.::::.: ..::::::
Notice that the marker on channel 2 tracked the marker on channel 1.
_ /,, ._ ,,...,.,.,..,. _
i ..J ../ ;. :;
25. ~~~~ L-1 L-) ~~.~~~~~~ ~~~~~~.~~~.
..A.. .;:......:.i ii . . ..li .:,.... ..:.... >;>::z.. .A..... >..;;> . . . . ~.~...>.~.~....~ .:...m . . . . . .A.. i . . ..A.. : .A.... >&ii . . . .. . . . ..A.. ~.~.~.~.~..~.....~.~~...i.~ . ..A . . . . . . . . .. ..~......i..; i
26. lb take the channel 2 marker out of the A mode so that it reads the absolute output power
of the amplifier (in dBm), press:
) p
_
):::: ~ ,.~,..
(Marker_) .~~~~~~ ~~~~~~~~~~’
Making Measurements 2-57