Chapter 6 6-9
Front-Panel Key Reference
AMPLITUDE Y Scale
Presel Center Agilent E4404B, E4405B, E4407B and E4408B only. Adjusts the
frequency of the preselector filter to optimize the amplitude accuracy at
the active marker frequency. With
Input Mixer (Ext) selected, Presel
Center adjusts the frequency of the external preselector filter to
maximize the amplitude at the active marker frequency. If activated in
a non-preselected band,
Presel Center does nothing.
Presel Adjust Agilent E4404B, E4405B, E4407B and E4408B only. Allows manual
adjustment of the preselector frequency to optimize its response on the
signal of interest.
Y Axis Units Accesses the menu keys that change the amplitude units. Amplitude
units are maintained for both logarithmic and linear modes. The
amplitude units can be changed by pressing
dBm, dBmV, dBµV, Volts,or
Watts. Key Access: AMPLITUDE Y Scale, More 1 of 2
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. Pressing Preset also sets
the offset to zero. See also the
Ext Amp Gain key description. Key Access:
AMPLITUDE Y Scale, More 1 of 2
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. The preamp is switched off in
frequency bands above 3 GHz and the correction not applied. When the
preamp is on, a PA indication appears on the left side of the display. Key
Access:
AMPLITUDE Y Scale, More 1 of 2
Corrections Accesses the Corrections On Off and Modify keys. Pressing Corrections
(On) 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 Modify menu. When
Corrections (On) 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 Modify menu. Pressing
Modify accesses the following menu of keys that will allow you to create
or modify an amplitude-correction factors table. Key Access:
AMPLITUDE Y Scale, More 1 of 2
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