Chapter 2 General Operation
Using limit lines
9102 Handheld Spectrum Analyzer Software version 5.31
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Overview A very useful feature of the 9102 is the possibility to set limits for the
trace A results. These are displayed on the screen and the 9102 can
show if the results exceed the limits.
Two different limit modes exist in the 9102. In the first case, the limits
exist of horizontal lines for the upper and lower limit. This method is
called “simple limits”; the limits can be entered directly in the Limits
menus of the 9102.
In the second case, there are more complex limits as shown in the
example in Figure 7. These limits can be entered with a comfortable
tool on a PC and loaded to the 9102 via RS-232 or LAN interface. A set
of limit lines can be used to define a measurement template. There are
versatile tools around these limits available on the 9102, such as a fail
counter, a beep when a failure occurs, or a measurement hold function
upon failure. The limits can be used both in the frequency and in the
time domain.
Up to 99 sets of limits can be stored on the 9102.
The actual limit values must be defined on a PC and loaded to the 9102
using the 9100 Data Exchange Software. Several limit files can be
stored on the 9102. The name of the current limit file is indicated in the
upper left-hand corner.
Note that the limits are defined within a grid, no matter what the units
on the vertical and horizontal axes are. This way, you can apply the
limits to different frequency ranges and power levels. It is your respon-
sibility, however, to select a useful frequency range, reference level and
level scale.
Note that a FAIL indication may occur if the start frequency is 0 Hz and
an upper limit is set at this frequency.
Using simple limits Simple limits consist of constant upper and lower limits. They must be
activated to take effect. Once activated, each measurement is accom-
panied by a Pass/Fail verdict indicating whether or not the measure-
ment result was within the limits.
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