General Purpose Oscilloscope Menus
Math Menu
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FFT Magnitude
Generates a new waveform by using a fast Fourier transform (FFT). Refer to
the FFT Menu, earlier in this chapter, for a detailed description of the FFT
features and functions.
Function scaling replaces scale and oset when this key is selected.
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Math
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Define Function
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Operator
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FFT magnitude
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bw limit
The variable bandwidth limit lter is a fourth order low pass Bessel lter.
K
ey
Path
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Math
5
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Define
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Operator
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bw
limit
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Operand
The
math
operator
is
performed
either
on
operand
1,
or
on
operand
1
and
operand
2.
The
number
of
operands
used
depends
on
the
math
operator
you
select.
F
or
example
,
add
requires
two
operands
while
invert
requires
only
one
operand.
Operand
lets
you
select
from
channels
,
functions
,
waveform
memories
,
or
a
constant.
If the
operand
waveforms
have
dierent
record
lengths
,
the
function
uses
the
shortest
record.
If
two
operands
have
the same
time base
scale,
the resulting
function
has
the
same
time
scale
which
results in
the proper
time scale
for the
function.
Constant operands have the same time scale as the associated waveform
operand.
A waveform function operand is acquired even if its display is turned o.
Function 1 is allowed as an operand for function 2. This allows you to
construct
equations
with
up
to
two
operators
and
three
operands
.
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Math
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Define Function
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Operand 1
10-50
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