58 Chapter 2
Front-Panel Key Reference
AMPLITUDE Y Scale
Ref Lvl Offst Adds an offset value to the displayed reference level. Reference-level
offsets are only entered by using the numeric keypad. Entering an
offset does not affect the trace or the attenuation value. Reference-level
offsets are used when gain or loss occurs between a device under test
and the analyzer input. Thus, the signal level measured by the analyzer
may be referred to as the level at the input of an external
amplitude-conversion device. When an amplitude offset is entered, its
value appears on the left side of the display under Offst (as opposed to
frequency offsets which appear at the bottom of the display). To
eliminate an offset, press
Ref Lvl Offst, 0, dB. When Preset Type is set to
Factory, pressing Preset also sets the offset to zero. See also the Ext Amp
Gain
key description.
Key Access:
AMPLITUDE Y Scale, More
Int Preamp
On Off
Agilent ESA-E Series only (E4401B, E4402B, E4404B, E4405B and
E4407B) with Option 1DS. Turns the internal preamp on and off.
Pressing
Int Preamp (On) results in a correction being applied to
compensate for the gain of the preamp so that amplitude readings show
the value at the input connector. When the preamp is on, a PA
indication appears on the left side of the display. The preamp is
switched off in frequency bands above 3 GHz and the correction is not
applied. In this case, the PA indication will still appear even though the
preamp is not activated.
The preamp is specified to operate over a 1 MHz to 3 GHz range for the
E4402B, E4404B, E4405B and E4407B. The preamp range for the
E4401B is 100 kHz to 1.5 GHz, except for Option 1DP, which is 1 MHz
to 1.5 GHz.
Key Access:
AMPLITUDE Y Scale, More
Corrections Accesses the Corrections menu keys which allow you to enable the
corrections function and to select which set of correction factors you
wish to modify.
Key Access:
AMPLITUDE Y Scale, More
Apply Corrections
Yes No
Pressing Apply Corrections (Yes) turns on the
amplitude-correction factors. Corrections will only be
applied to the sets of correction factors whose correction
state is set to On. To turn a set of correction factors on,
use the
Correction On Off key in the Antenna, Cable,
Other, or User menus. When
Apply Corrections (Yes) is
selected, an A will appear on the screen annotation
whether or not a correction set has been turned on
using the
Correction (On) key in the Antenna, Cable,
Other, or User menus.
Key Access:
AMPLITUDE / Y Scale, More, Corrections
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