Agilent Technologies 11974 Series User Manual page 69

Operation
Using an 71000 Series Spectrum Analyzer
Table 3-2. External Mixing Bands and Associated Mixing Harmonics
Band Harmonic Number (N)
F 24+
D 30+
G 36+
Y 42+
J 50+
CONV LOSS
PRESEL PEAK
PRESEL DAC
pre-select
preset input
INSTR PRESET
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(conversion loss) offsets the reference level to compensate for
amplitude losses at the active input port. If necessary, use
to activate the desired input port before specifying its
select input
conversion-loss offset.
To clear the offset, enter a conversion loss of zero.
After instrument preset, a default value of 30 dB is activated
automatically for the input port of the external-mixer-interface
module.
(preselector peak) adjusts the tracking of the preselector filter to
yield maximum amplitude accuracy at the active marker position. If
a marker is not present,
highest signal level.
Whenever a measurement is made, the current preselector DAC
value corresponding to the selected measurement range determines
the preselector tracking. Press
preselector and store a new value in the preselector DAC. When
measuring frequency spans greater than 0 Hz, the analyzer must be
swept several times to peak the preselector. Thus, the analyzer
requires several minutes to peak the preselector when measuring
with slow sweep times. To execute the peaking function quickly,
change the span to either 0 Hz or such that the sweep time is
approximately 100 ms, before pressing
(preselector DAC) enters a value into the preselector DAC for the
frequency range corresponding to the frequency at the marker. If a
marker is not present,
PRESEL DAC
the display.
allows access to the preselector functions when a preselector module
is in the system. The
pre-select
.
State
sets which active input port will be selected when the INSTR
PRESET is pressed. The preset input softkey can be accessed by
pressing , then
State MORE
resets to the preset input and to the lowest full frequency range
available. (For an external mixer, this is band A.) This is a front
panel hardkey.
with an 70907B, 70909A, or 70910A
Frequency Range (GHz)
90.0 to 140.0
110.0 to 170.0
140.0 to 220.0
170.0 to 260.0
220.0 to 330.0
places a marker at the
PRESEL PEAK
to repeak the
PRESEL PEAK
PRESEL PEAK
places a marker at the center of
softkey can be accessed by pressing
.
.
Chapter 3