5-10
Hardkey/Softkey Reference
Analyzer Functions
displays the cutoff frequencies of the bandwidth using
markers on the data trace.
turns bandpass filter bandwidth testing on or off. When
bandwidth testing is on, the analyzer locates the
maximum point of the data trace and uses it as the
reference from which to measure the filter’s bandwidth.
Then, the analyzer determines the two cutoff frequencies
of the bandpass filter. The cutoff frequencies are the two
points on the data trace at a user-specified amplitude
below the reference point. The cutoff frequencies are also
referred to as the N dB Points where “N” is defined as the
number of decibels below the peak of the bandpass that
the filter is specified. (The amplitude is specified using the
softkey.)
The bandwidth is the frequency difference between the
two cutoff frequencies. The bandwidth is compared to the
user-specified minimum and maximum bandwidth limits
(entered using the and
softkeys.)
If the test passed, a message is displayed in green text in
the upper left portion of the LCD. An example of this
message is: BW1: Pass, where the “1” indicates the
channel where the bandwidth test is performed. If the
bandwidth test does not pass, a fail message indicating
whether the bandpass was too wide or too narrow is
displayed in red text. An example of this message is BW1:
Wide.
is used to enter the C0 term in the definition of an OPEN
standard in a calibration kit, which is the constant term of
the cubic polynomial and is scaled by 10
−15
.
is used to enter the C1 term, expressed in F/Hz
(Farads/Hz) and scaled by 10
−27
.
is used to enter the C2 term, expressed in F/Hz
2
and
scaled by 10
−36
.
is used to enter the C3 term, expressed in F/Hz
3
and
scaled by 10
−45
.
key leads to a series of menus to perform measurement
calibrations for vector error correction (accuracy
enhancement), and for specifying the calibration
standards used. The key also leads to softkeys
which activate interpolated error correction and power
meter calibration.
Cal
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