The Power Menu; Understanding The Power Ranges; Automatic Mode; Manual Mode - HP 8753E User Manual

The Power Menu

The power menu is used to define and control analyzer power. It consists of the following
softkeys:
. . . . . . . . . . . . .
n
. ~~~~~~~ provides access to the power range menu.
. !&&$~~ compensates for power loss versus the frequency sweep, by sloping the output power
upwards proportionally to frequency.
. " ,-,- , , .<:....:. .:;, , , ,
occurs, the trip is reset by selecting 'ZKJM!I& '@J& &&.
. :~ ; .y; : C,'yJ
. . . . . . . . . . . . . . . . . . . . . . . . . . .
n
. . . . . . . s . . . . . A w . A . . . . . . . . . . . . .

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

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
. . . . . . . . . . . . . . . . . . . . _ _ ; ; ,; ; , . : . , . ~ ~ : . : . : . : . : . : . ~ . : . : . ~ , . : :
these transitions occur (see Figure 6-6).

Manual mode

the power range that corresponds to the power level you want to use. This is accomplished by
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.
Application and Operation Concepts
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