HP 8753E manual Power Menu, Understanding the Power Ranges

The Power Menu

The power menu is used to define and control analyzer power. It consists of the following

softkeys:

i .:. i, .,..,. :.:.:.:.: .,., ,.,,.,.,., ;;,.,,_ ,,.,.,.,.,.,.,.,. ,..,. ,........ . . . . . . . . . .

n:~~~~~:~~~~/ ;:.-~~~ allows you to select power rages automatically or manually.

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. ~~~~~~~ provides access to the power range menu. b b.. ,,,............. :. .:..:...:...<<<<.

. !&&$~~ compensates for power loss versus the frequency sweep, by sloping the output power

upwards proportionally to frequency.

t’ ..,I”

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W ~~~~~~~~~~6~~~,toggles the power slope fun&ion on or off.

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,,,

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,-,-

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allows you to switch the source power on or off. When a power trip

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.,.

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occurs, the trip is reset by selecting ‘ZKJM!I& ‘@J& &&.

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~.:~~~;.~~~~~~~~~, allows you to couple or uncouple primary channel power.

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

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n'~~~~~~~,:allows you @couple or~couple p&power.

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Understanding the Power Ranges

The built-in synthesized source contains a programmable step attenuator that allows you to directly and accurately set power levels in eight different power ranges. Each range has a total span of 25 dl3. The eight ranges cover the instrument’s full operating range from + 10 dBm to -85 dBm (see F’igure 6-6). A power range can be selected either manually or automatically.

Automatic mode	.::,....:.:.:.:.:.,.:.:.,:.:.:.:.:.:.:.:.:.:.:.:.:.:..:.:.:.:.:.:.:.~:..~:. .:..:....’
..I..... ..w;;: ;:/,.:<.,.;:.:.:;.:.: ..

If you s&& ~~~~~~~~~6; you c-8 enter my power level w-itfi the total operating range

,.......

of the instrument and the source attenuator will automatically switch to the corresponding range.

Each range overlaps its adjacent ranges by 15 dI3, therefore, certain power levels are designated to cause the attenuator to switch to the next range so that optimum (leveled)

performance is maintained. These transition points exist at -10 dl3 from the top of a range and
at +5 dB from the bottom of a range. This leaves 10 dl3 of operating range. By turning the
. . . . . . . . . . . . . . .,..,.. ..,.,...	......... ;;,;;,.:.,.~~:.:.:.:.:.:.~.:.:.~,.::
RPG knob with ~~~~~:~~~~ being the a&ve fun&ion, you cm hem the attenuator tit,& m
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these transitions occur (see Figure 6-6).

Manual mode

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If you se&$ ~~~~~~~~:~~~ you must f&-St enter the power ranges menu and maufly @e&,
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the power range		that corresponds to the power level you want to use. This is accomplished by
”;,....: .,./		; ..a..7.“	;..~..:.:.:.:.: .,.,...:.:.:~.,.:.:.:.:..:.:.:.:.:.:..
pressing the ~~~~~~ softkey md &,n &,&ing one of the eight avaable ranges. In
..-	--		-

this mode, you will not be able to select power levels greater than 3 dI3 above or below the range limits This feature is necessary to maintain accuracy once a measurement calibration is activated.

When a calibration is active, the power range selection is switched from auto to manual mode, and PRrn appears on the display.

6-14 Application and Operation Concepts