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FUNCTION REFERENCE 5 - 49
3. Calculate all other signal parameters. The formulas for all time and volt
measurements are given in the sections for DELAY MEASUREMENT, TIME
MEASUREMENT, and VOLT MEASUREMENT.
The HISTOGRAM method determines the voltage levels. This method is as follows:
- The input data (= trace) is used to create a histogram. This histogram
evaluates all signal amplitude values that occur in a given signal, plus the
number of occurrences for each amplitude value found in the trace. The
highest number of occurrences at the high end of amplitude range determines
the HIGH level, when the count is over 5% of the total number of samples.
Under the same condition, the highest count in the low end of the amplitude
range determines the LOW level..
- If the 5% limit is not reached by any count, the HIGH level is set to the MAX level
and LOW is set to the MIN level. MAX and MIN are the highest and the lowest
detected amplitude levels. This occurs for example when the signal is a sinewave.
- The DISTAL, MESIAL, and PROXIMAL level are now derived as follows:
DISTAL = 0.9
*
(HIGH-LOW)
MESIAL = 0.5
*
(HIGH-LOW)
PROXIMAL = 0.1
*
(HIGH-LOW)
Remote commands:
CPL: QM (Command to query a measurement)
Refer to Chapter 6 for full details.
MULTIPLY (
MATHEMATICS
)
Description:
The MULTIPLY function performs a point-to-point multiplication of two traces. The
value of each data point is related to ground. The result of the MULTIPLY function
is a trace in a register.
The result trace can be scaled and positioned.
Scaling
is the correction of the resulted trace to fit in the screen. The TRACK
control us used to adjust scaling.
Vertical positioning
is called offset. It offsets each sample in the resulting trace
with a certain value so that the trace can be "moved" vertically. The ∆ control is
used to adjust vertical positioning.
The scale factor and the offset factor are displayed in the ‘MATH SCALE’ menu.
Pressing the ‘autoscale’ softkey automatically selects the settings for the trace to
fit in the screen.