8 . Press ~~~~~~~~,, ~~~~~~~~~~o~~ to acCeSS the Loads menu. When the displayed

-.. i.:..l. //..:....m ..:s...::<h i

trace settleq,,),,press the softkey corresponding to the load used. If a sliding load is / ,..<.:<.:.: .,.. ::.::. r:<<..: “‘.‘..

used, press ~~~~~~~~:: to access the Sliding Load menu. Position the slide and press

::..:. ..\... “,,,;,;.

.i&$j#$ .G& ;igjfj#

.~.>>...;;~~:< :....,,,/ :. :; .._.:.:::s<<<<<.,<. . . . . .*.

9 . When all the/ appropriate load measurements are complete, the load data is measured and ,. / ,. _

the :~~~~~~~~~~~, softkey label is underlined.

..). iz..,;.., ““..;’+ ;..,, .y; .~::, ,;,,‘-:;;;,

10. Come& the lOad to PORT 2 a& press ~~~~~.,:~~~~~:

...;.....:~.l.~~~:~.:

::.:....:.:..i

::

;:. *

11.Repeat the previous TRM load measurement steps for PORT 2.

12.After the measurement is complete, press:

;/ .,. _; _ ., _

~~~‘;~~~~~~~~~..

13.‘lb measure the “ISOLATION” class, press:

~~~~~~~~,,:

q You could choose not to perform the isolation measurement by pressing

.t+., . . ..‘b.. ;;; ; ,..;;>?;<<.<.?T ,, .~. ~.~~

#jja&!g :~~~~~~~~~~ ~~~~~~~;

.z::.: ~i....i.....

.A.............s.....%.Z.......J...Z .::..,.....A .i .....:.‘n.......v, .>;:>>:..:..: i,,,_.ih>.>;;;..::::../:..........,./..:......,._............i -

Note You should perform the isolation measurement when the highest dynamic range is desired.

To perform the best isolation measurements, you should reduce the system bandwidth, and/or activate the averaging function.

A poorly measured isolation class can actually degrade the overaIl measurement performance. If you are in doubt of the isolation measurement quality, you should omit the isolation portion of this procedure.

14.You may repeat any of the steps above. There is no requirement to go in the order of steps. When the analyzer detects that you have made all the necessary measurements, the message me will show PRESS ‘DONE’ IF FINISHED WIJ’lj CAL. press .~~~~~~~.

The message COMPUTING CAL COEFFICIENTS will appear, indicating that the analyzer is performing the numerical calculations of error coefficients

Note You can save or store the measurement correction to use for later measurements. Refer to the “Printing, Plotting, and Saving Measurement Results” chapter for procedures.

15. Connect the device under test. The device S-parameters are now being measured.

Note When making measurements using the same port with uncoupled channels, the power level for each channel must fall within the same power range setting of that single port. An error message will be displayed if you enter two power levels that do not fall within the same power range.

5-26 Optimizing Measurement Results