Waveform analysis
R&S
®
RTM3000
109User Manual 1335.9090.02 ─ 09
Common Log. log(Source)
Calculates the logarithm to the basis 10 of the source. Note that
the logarithm of a negative number is undefined and the result is
clipped.
Natural Log. ln(Source)
Calculates the logarithm to the basis e (Euler number) of the
source. Note that the logarithm of a negative number is undefined
and the result is clipped.
Derivative f'(Source), see Chapter 7.2.4.1, "Derivative", on page 109.
Integral Calculates the definite integral of the source.
The calculation is displayed in the illustration. The integration
starts at point "a" and adds the area beneath the waveform. Point
"b" indicates the currently calculated value. At the end of the posi-
tive alternation, the integral function reaches its maximum. Due to
the homopolar operand used in this example, the waveform of the
area reaches zero after the negative alternation.
Use a "V-Marker" cursor to measure the area for an extract of the
waveform.
Low pass
High pass
Low pass filter and high pass filter, see Chapter 7.2.5, "Filters",
on page 110.
Track ...
Track functions, see Chapter 7.2.6, "Tracks", on page 110.
Remote command:
●
CALCulate:MATH<m>[:EXPRession][:DEFine] on page 479
●
CALCulate:MATH<m>:LABel on page 481
●
CALCulate:MATH<m>:LABel:STATe on page 481
7.2.4.1 Derivative
The derivative corresponds to the rise of the tangent through a function point and indi-
cates the dimension of the change in quantity of the source in time. The larger the
quantity change of the operand per time becomes, the larger the result of the derivative
is.
The calculation is approximated using the secant based on the current calculated value
and a value with a distance of 0.1 DIV. Thus, the time axis has a finitely small resolu-
tion. Therefore, scale the input signal to display the required area appropriately. The
formula is:
DERI(Source,dx) in <unit>
Mathematics
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