The Marker Calculation Menu - HP 3563A Operating Manual

The Marker Calculation Menu

The marker-calculation softkeys allow you to do one-time marker calculations. Press
MARKER MARKER CALC
followed b y
following:
GAIN &
PH MGN
FREQ &
DAMP
POWER
AVG
VALUE
to access these softkeys (see figure
Calculates and displays the gain and phase margin for the active trace.
The gain margin is defined as the magnitude level (in dB) when the
180
phase crosses below
-
indicates the possibility of an unstable system. The phase margin is
180
defined as degrees minus the absolute value of the phase angle (in
degrees) when the gain is equal to
indicates the possibility of an unstable system. I f the gain o r phase
crossover occurs between measured data points, the actual crossover
linearly interpolated.
The search for zero gain and phase starts at the beginning of the data,
regardless of whether it is on the screen, and continues until the first
gain and phase crossovers are found. Or, the search starts at the marker
X
if an
marker is on the screen. The search is limited to the area
between the two markers if an
gain and phase margin values found by the search are displayed above
the trace and are preceded by "G=" and "P=", respectively. If no
margin is found, the message "NONE" is displayed.
Calculates and displays the resonant frequency and damping values in
the active trace using a 1
calculation is made inside the
on both sides of the active single
accurate values, the marker band (or the
least the 3 dB bandwidth. This works only for frequency response
displays.
Calculates and displays the power contained in the current
band or in the entire trace if a band is not active. For frequency domain
displays that have units,
selected) or power (for all other units). Energy is always expressed as
peak, and power is expressed as rms. For all frequency domain displays,
the POWER marker compensates for the effect of the window when
the units selected are VOLTS or VOLTS
Calculates the average value over the portion of the active trace
enclosed by the current
marker is not active.
The Special Marker Functions
degrees. A value in the range of
0
dB or 1. A value less than
X
marker band is on the screen. The
degree of freedom curve fitter. The
X marker band if it is active, or
X marker if a band is not active. For
20
points), should cover at
POWER
shows energy (if the ESD unit is
2
.
X
marker band or the entire trace if the
Display Configuration
SPCL
8-10),
which d o the
± 6dB,
± 10
is
20 points
X marker
X
8-29