2-10
Supplement for the Reference Guide (Firmware Revision 7.66)
Hardkey/Softkey Reference
New Softkeys
These are new softkeys and do not appear in reference guides printed prior to July 2000:
selects the bandwidth limit line choice. This selection
leads to the menu used to define and test bandwidth limits
of a bandpass filter. Refer to the “Using Bandwidth Limits
to Test a Bandpass Filter” section in the “Making
Measurements” chapter of the user’s guide.
displays the measured bandwidth value to the right of the
pass/fail message.
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.
selects the menu used to edit the ripple limits. The edit
ripple limits menu allows you to add, change, or delete
ripple limits for the ripple test.
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