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Spectrum Analyzer Mode Key Descriptions
Spectrum Analyzer Mode Functions
A-B
+
A
ON OFF
when ON is underlined, subtracts the data in trace B from
the measured data in trace A. A minus sign
(-)
appears
between the trace A status and the trace B status in the
screen annotation while the function is active.
To deactivate this function, press A
-
B
--+
A ON OFF
so that OFF is underlined. The A-B
+
A and B-DL
---f
B functions are math functions. Unlike operations on
dBmV
units, math functions operate on measurement
units. Measurement units are used to format trace data for
data within the graticule limits. The displayed amplitude
of each element falls on one of 8000 vertical points with
the value of 8000 being equal to the reference level. For
log scale data, each point is equal to 0.01
dB.
The peak
of a signal equal to 39
dBmV,
or one division below the
reference level, is equal to 7000 measurement units
(8000
-
1000 = 7000). In linear mode, each point has a
resolution of [reference level in
volts/SOOO].
For example, if trace A contains amplitude values of 39
dBmV
and trace B contains amplitude values of 9
dBmV,
the
result of the A
-
B
+
A function would be 39.004
dBmV
if
dBmV
units were used. Since measurement units are used
for the A
-
B
--+
A function, the result of A
-
B
+
A is
-
1
dBmV
(39
dBmV
= 7000 measurement units, 9
dBmV
=
4000 measurement units; the result is 3000 measurement
units, which is equal to -1
dBmV).
Front-Panel Key Access
@GEE-]
A+C!
copies trace A into trace C.
Front-Panel Key Access @EXE]
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