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HP4402.book : chapter2.fm 26 Tue Apr 22 15:20:23 1997
Power Meter Operation
Setting Averaging
2-26
HP EPM-441A User’s Guide
Setting Averaging
The power meter uses a digital filter to average power readings. The
number of readings averaged can range from 1 to 1024 in binary
progression. This filter is used to reduce noise, obtain the desired
resolution and to reduce the jitter in the measurement results. Increasing
the value of the filter length reduces measurement noise. However, the
time to take the measurement is increased. You can select the filter length
or you can set the power meter to auto filter mode. The default is “
AUTO
”.
When the auto filter mode is enabled, the power meter automatically sets
the number of readings averaged together to satisfy the filtering
requirements for most power measurements. The number of readings
averaged together depends on the resolution and the power level currently
being measured. Figure 2-4 lists the number of readings averaged for each
range and resolution when the power meter is in auto filter mode and is
set to normal speed mode (refer to the HP EPM-441A/442A Programming
Guide for details of the readings averaged in the other speed modes).
Resolution is a window function and not a channel function. In the case
where a channel is set up in both the upper and lower window and the
resolution settings are different, the highest resolution setting is taken to
calculate the averaging number. For example, if the upper window has a
resolution setting of 2 and is measuring channel A and the lower window
has a resolution of 4 and is also measuring channel A. In this instance
channel A averaging is calculated with a resolution of 4.
Содержание EPM E4418A
Страница 20: ...HP4402 book HP4402LOF doc 6 Tue Apr 22 15 20 23 1997 Contents 6 HP EPM 441A User s Guide ...
Страница 22: ...HP4402 book HP4402LOT doc 8 Tue Apr 22 15 20 23 1997 Contents 8 HP EPM 441A User s Guide ...
Страница 23: ...HP4402 book chapter1 fm 1 Tue Apr 22 15 20 23 1997 1 Getting Started ...
Страница 41: ...HP4402 book chapter2 fm 1 Tue Apr 22 15 20 23 1997 2 Power Meter Operation ...
Страница 101: ...HP4402 book chapter3 fm 1 Tue Apr 22 15 20 23 1997 3 Menu Reference ...
Страница 127: ...HP4402 book chapter4 fm 1 Tue Apr 22 15 20 23 1997 4 Error Messages ...
Страница 137: ...HP4402 book chapt5_2 fm 1 Tue Apr 22 15 20 23 1997 5 Specifications ...
Страница 158: ...HP4402 book HP4402IX doc 6 Tue Apr 22 15 20 23 1997 Index 6 HP EPM 441A User s Guide ...