76
b)
Frequency Domain Functions
The X-scaling control fields are used when frequency domain functions are displayed.
They
control
the
start
of
the frequency domain function, the displayed frequency span,
and linear
or
logarithmic
scaling. As with time domain functions, the
start
and frequen-
cy span
fields can be used to expand the displayed frequency domain function.
X: D +
~-.I
___
____.
(start)
(FREQ.
SPAN)
(FREQ. SPAN)/2*
{
0.
LIN
1.
LOG**
* Not allowed with a log. X-axis.
* * Log.
display is over 2 decades. It is illegal when the 2032 is set
to
Zoom.
c) Time A
vs.
B,
Enhanced Time A
vs.
B,
Nyquist Plots
In
Time A vs. 8 and Nyquist plots, the X-scaling is controlled by the Y -scaling.
In
Time
A vs. 8
plots, the X-axis represents channel 8, while in Nyquist plots,
it
represents the
real part.
{
Y-SCALE/4
(half
format)
X:
(full scale)
Y-SCALE/2
(full
format)
d)
Nichols Plots
In
Nichols plots, the X-scaling is always between ±
200°.
Phase compensation can be
applied
to
complex frequency domain functions. It is a hidden field, which only be-
comes
visible when the Field Selector is indexed
to
the same line as the X-scaling
control
fields,
or
the phase compensation is
not
equal
to
zero.
~
T is equal
to
the time
resolution
or
sampling interval, and T is equal
to
one
memory
period
or
record. Note
that
although the phase is scaled
from
-200
to
+
200°,
cursor
read-outs
are in the
range
±
180°.
X:
-200
to
+ 200 DEG CMP:
e) Probability Density or Distribution
-T/2
-T/2
+
~T/128
0
T/2
+
~
T/128
T/2
When a Probability Density
or
Distribution
is displayed, the X-scaling is
from
-V
to
+
V,
that is
from
minus
to
plus the peak input voltage setting. The width
of
each class can
be changed via the
~X
field.
X:
-V
to
+ V
~x=D
V/16
V/32
V/64
V/128
V/256
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