
Placing Specification Lines on the Graph
The Spec Lines feature allows you to place a reference line (specification
line) on the Results Graph.
The Spec Lines softkey accesses a display that allows you to define a
specification line by entering the offset frequency and amplitude for up
to 22 points along the line. The points are connected on the Results Graph
with linear lines in the order in which they are entered. The Next Page
softkey accesses points 12-22.
For example, if you wished to draw a line on the Results Graph that starts
at -60 dBc at 100 Hz, with a -20 dB per decade slope to 1 kHz, then
change to a —10 dB per decade slope to 100 kHz, you would enter the
parameters shown in the following Specification Line Table.
DEFINITION
OF
NOISE SPEC LINES
Offset Frequency
(Hz)
amplitude (dBc/Hz)
Point
* i
Point
S 2
Point
tt 3
Point
* 4
Point
tt
5
Point
ft 6
Point
ft 7
Point
ft 8
Point
tt 9
Point ttlO
Point
1111
10
l.E+3
10.E+3
i00.E*3
-30
-70
-:¥)
acceptable
Value5:
IO.E-3
TO
10.E+"?
To
return
to
'GRRPH
DEFINITION'
[Press
'DONE'
]
DONE Delete
Point
Figure 2-29. Example of Noise Spec Line Table
reu.05SEP89
Define Graph 2-118.1
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