Agilent Technologies HP 70910A Guía de usuario descargar pdf (Pagina 74)

74 Chapter 3

Operation

Using 8563A, 8561B, 8560A, or 8560 E/EC-Series Spectrum Analyzers

Operation

12.Change the spectrum analyzer center frequency to the value indicated below, then save

this setting in an unused register:

for an 11974A: 40 GHz

for an 11974Q: 50 GHz

for an 11974U: 60 GHz

for an 11974V: 75 GHz

13.On the rear-panel of the 11974, adjust the corresponding potentiometer for the mixer

listed below until one or both of the green LEDs are lit.

for an 11974A: “40 GHz SET”

for an 11974Q: “50 GHz SET”

for an 11974U: “60 GHz SET”

for an 11974V: “75 GHz SET”

14.Repeat step 10 through step 13 until green lights are lit at both frequencies without any

additional adjustments.

Operation

Band Selection

1. If necessary, configure the analyzer for a preselected external mixer by pressing

CONFIG

and setting

EXT MXR PRE UNPR to PRE.

2. Set the LO tuning sensitivity as follows:

For the 8564E or 8565G, press

AUX CTRL, REAR PANEL, and setting V/GHz .25 .50

.50

For all other analyzers, press AUX CTRL, REAR PANEL, and .5 V/GHz (FAV)

3. If necessary, mate the 11974 to the spectrum analyzer being used for preselected

external mixing by using the Frequency Tracking Calibration procedure above.

4. Use the following key sequence to enter the external mixing mode and to select the

desired band of operation.

AUX CTRL

EXTERNAL MIXER

FULL BAND

Use the ⇑ or ⇓ key until the desired band is reached.

NOTE The above band-selection key sequence must be used to enter the external

mixing band of operation. Do not enter in the center frequency of the band

directly.

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Agilent Technologies HP 70910A Guía de usuario Pagina 74