Agilent Technologies HP 70910A Podręcznik Użytkownika Pobierz pdf (Strona 68)

68 Chapter 3

Operation

Using an 71000 Series Spectrum Analyzer with an 70907B, 70909A, or 70910A

Operation

F 24+ 90.0 to 140.0

D 30+ 110.0 to 170.0

G 36+ 140.0 to 220.0

Y 42+ 170.0 to 260.0

J 50+ 220.0 to 330.0

CONV LOSS (conversion loss) offsets the reference level to compensate for

amplitude losses at the active input port. If necessary, use

select input to activate the desired input port before specifying its

conversion-loss offset.

To clear the offset, enter a conversion loss of zero.

After instrument preset, a default value of 30 dB is activated

automatically for the input port of the external-mixer-interface

module.

PRESEL PEAK (preselector peak) adjusts the tracking of the preselector filter to

yield maximum amplitude accuracy at the active marker position. If

a marker is not present,

PRESEL PEAK places a marker at the

highest signal level.

Whenever a measurement is made, the current preselector DAC

value corresponding to the selected measurement range determines

the preselector tracking. Press

PRESEL PEAK to repeak the

preselector and store a new value in the preselector DAC. When

measuring frequency spans greater than 0 Hz, the analyzer must be

swept several times to peak the preselector. Thus, the analyzer

requires several minutes to peak the preselector when measuring

with slow sweep times. To execute the peaking function quickly,

change the span to either 0 Hz or such that the sweep time is

approximately 100 ms, before pressing

PRESEL PEAK.

PRESEL DAC (preselector DAC) enters a value into the preselector DAC for the

frequency range corresponding to the frequency at the marker. If a

marker is not present,

PRESEL DAC places a marker at the center of

the display.

pre-select allows access to the preselector functions when a preselector module

is in the system. The

pre-select softkey can be accessed by pressing

State.

preset input sets which active input port will be selected when the INSTR

PRESET is pressed. The preset input softkey can be accessed by

pressing

State, then MORE.

INSTR PRESET resets to the preset input and to the lowest full frequency range

available. (For an external mixer, this is band A.) This is a front

panel hardkey.

Table 3-2. External Mixing Bands and Associated Mixing Harmonics

Band Harmonic Number (N) Frequency Range (GHz)

1 2 ... 63 64 65 66 67 68 69 70 71 72 73 ... 153 154

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