BRUEL & KJAER 2032 Instruction Manual page 86

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