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Adds an offset value to the displayed reference level. Reference-level
Ref Lvl Offst
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
Factory
Gain
Key Access:
Turns the internal preamp on and off. Pressing
Int Preamp
in a correction being applied to compensate for the gain of the preamp
On Off
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
E7402A, E7403A, E7404A and E7405A. The preamp range for the
E7401A is 100 kHz to 1.5 GHz.
Key Access:
Accesses the
Corrections
corrections function and to select which set of correction factors you
wish to modify.
Key Access:
Apply Corrections
Yes No
Antenna
Chapter 2
, pressing
also sets the offset to zero. See also the
Preset
key description.
AMPLITUDE Y Scale
AMPLITUDE Y Scale
menu keys which allow you to enable the
Corrections
AMPLITUDE Y Scale
Pressing
Apply Corrections (Yes)
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
Other, or User menus. When
selected, an A will appear on the screen annotation
whether or not a correction set has been turned on
using the
Other, or User menus.
Key Access:
Accesses the Antenna menu of keys which allow you to
correct for antenna loss, but may be used for any kind
of correction.
,
,
. When
Ref Lvl Offst
0
dB
,
More
,
More
,
More
key in the Antenna, Cable,
Apply Corrections (Yes)
key in the Antenna, Cable,
Correction (On)
AMPLITUDE / Y Scale
Front-Panel Key Reference
AMPLITUDE Y Scale
is set to
Preset Type
Ext Amp
results
Int Preamp (On)
turns on the
,
,
More
Corrections
is
53
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