Agilent Technologies E4406A, Руководство пользователя

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Chapter 3 77
Setting the Mode
Mode Setup
Mode Setup
When you switch to another mode the instrument automatically presets
mode settings to defaults for that mode. The settings under mode setup
apply to all measurements in the mode.
NOTE
Prior to making measurements, it is important to set the parameters
under the mode setup key so they match the device to be tested and
your test setup. These parameters are not saved when you switch to
another mode. If you want to save these use the save state feature,
which is explained on
page 65 .
The
Mode Setup
key accesses two mode setup menus: (1) the
Input
menu
key accesses features including selecting inputs, changing input
attenuation, and modifying IF align settings, and (2) the
Trigger
menu
key, which enables you to choose trigger setup states for the
instrument.
Input Keys
By pressing the
Input
key you access menus which enable you to
activate an input port, adjust input attenuation, and adjust the IF align
signal.
Activate an Input Port and Adjust Input Power
• Input Port key. The
Input Port
menu key accesses a menu which
allows you to select one of the following input keys:
RF
,
I/Q
,
I only
,
50
MHz Ref
, and
IF Align
. These keys are explained below.
RF key. Use the
RF
key to reactivate the RF input after a
different input has been activated.
I/Q key. Use this input to test I and Q signals which are not
modulated onto a carrier.
I only key. Use this input to test I signals which are not
modulated onto a carrier.
50 MHz Ref key. Selects the internal 50 MHz reference signal.
The displayed signal amplitude will be
−
25 dBm.
IF Align key. The IF align signal is an internal calibration signal
used during the auto align process. You can view this signal and
change its characteristics through the IF Align menu.