Giga-tronics 8650A Series, Руководство по эксплуатации

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Series 8650A Universal Power Meters
2-12 Manual 31470, Rev. E, April 2001
Histogram
The Histogram feature displays graphical views of accumulated data distribution over a selective period
of time (see Figure 2-8). Highlight the Histogram option in the Power Meter Configuration menu and
press [
Config ].
1. Press [ Select Source ] and select the input channel (8652A only) or display the line number.
2. Toggle Log or Lin with the [ Log/Lin ] softkey.
3. Press [ Interval ] and select the duration the data is to be acquired. The range is from 1 second to 96
hours, or continuous.
4. Press [ OK ] to accept these settings or press [Cancel] to cancel the settings, and return to the Power
Meter Configuration menu.
5. Press [ OK ] from the Power Meter Configuration menu. The Histogram will display full screen as
shown in Figure 2-8.
There are additional functions available from the Histogram screen:
1. Press [ Reset ] to restart sampling.
2. Press [ Select Mode ] to toggle between distribution display functions.
a. The Histogram (see Figure 2-8) shows the percentage of time each power level is measured.
b. The CDF (Cumulative Distribution Function) shows the percentage of time a signal is below a
selected power level (see Figure 2-9). The x-axis displays the power level and the y-axis displays
the percentage of time the power is at or below the power level specified by the x-axis.
c. The CCDF (Complementary CDF) (see Figure 2-10) shows the percentage of time a signal is
above a selected power level for more accustomed viewing of a descending slope.
3. Press the [ Vert/Horiz ] toggle key to select the zoom axis scale, then press [ Zoom In ] or [ Zoom Out ] for
the selected axis.
Figure 2-8: Illustration of the Histogram
Sensor A Histogram
Vert
Horiz
Zoom
In
Zoom
Out
Exit
Cursor: - 46.89 dBm 1.45%
2%
-48.62 dBm -43.62 dBm
CAL ON
Interval: 1 min (sampling complete)
0%
Select
Mode
Reset