8-19
IM 703155-01E
Checking the Output Waveform
8
Explanation
Displaying the Waveform Data
The description is the same as section 8.1. See page 8-5.
Displayable Waveform Data Formats
The description is the same as section 8.1. See page 8-5.
CCDF Display
The waveform data stored on the VB8300 internal hard disk, CF card, or USB memory
can be displayed on a semilogarithmic graph with the vertical axis (Y) as the
accumulated value (logarithmic scale) of the instantaneous power that exceeds the
average power and the horizontal axis (X) as the amplitude of the instantaneous power.
Note
•
The waveform data that can be displayed is up to the first 2,000,000 points.
•
For the setup procedures on the Configure menu, see section 8.6.
Computation Begin Point (Begin Point)
You can set the start point in the following range.
Selectable range: 0 to (1999999 – the number of specified computed points) points (in 1
point steps)
• You cannot set a value greater than the data length of the waveform data.
• The computation begin point may change simultaneously within the data length of the
waveform data depending on the number of computed points (the next item
described). The computation begin point changes so that the specified number of
computed points is met.
Default value: 0 point
Number of Computed Points (Samples)
You can set the number of points in the following range.
Selectable range: 1 to 10000 points (in 1 point steps)
You cannot set a value greater than the data length of the waveform data.
Default value: 256 point
Vertical (Y) and Horizontal (X) Axes
• Upper Limit of the Vertical Axis (Y Top Value)
You can set the common logarithm scale (the accumulated value of the instantaneous
power that exceeds the average value) at the top edge of the waveform display frame.
Range: 1 to 100 (in 1 steps)
Default value: 1
If you specify 1, the logarithm scale at the top edge of the waveform display frame is
set to 1.0E0 (1
×
10
0
). If you specify 2, the logarithm scale at the top edge of the
waveform display frame is set to 2.0E0 (2
×
10
0
). If you specify 10, the logarithm
scale at the top edge of the waveform display frame is set to 1.0E1 (1
×
10
1
).
• The Number of Orders of Magnitude of the Logarithmic Scale (Y /Div)
You can set the vertical display range (the number of orders of magnitude (the range
of exponent values of the power of 10)).
Range: 1 to 10 (in 1 steps)
Default value: 5
• Vertical Axis Auto Scale (Y Axis Auto Scale)
The vertical scale is set so that the accumulated value of the instantaneous power
that exceeds the average power, which is computed from the waveform data, fits on
the waveform display frame.
8.3 CCDF Display
