prog.book : chapter1.fm 48 Mon Feb 15 09:24:37 1999
Power Meter Remote Operation
Setting the Range, Resolution and Averaging
1-48 HP E4418B/E4419B Programming Guide
Resolution
You can set the window’s resolution using the following command:
DISPlay[:WINDow[1|2]]:RESolution <numeric_value>
There are four levels of resolution available (1 through 4).
When the measurement suffix is W or % this parameter represents the
number of significant digits. When the measurement suffix is dB or dBM,
1 through 4 represents 1, 0.1, 0.01, and 0.001 dB respectively.
For further information refer to the resolution command on page 5-14.
Averaging
The power meter has a digital filter to average power readings. The
number of readings averaged can range from 1 to 1024. This filter is used
to reduce noise, obtain the desired resolution and to reduce the jitter in
the measurement results. 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. To enable and disable averaging use the following
command:
[SENSe[1]]|SENSe2:AVERage[:STATe] <Boolean>
Note If you are using the HP 437B remote programming language you
cannot enter a filter length above 512.
Auto Averaging Mode
To enable and disable auto filter mode, use the following command:
[SENSe[1]]|SENSe2:AVERage:COUNt:AUTO <Boolean>
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 1-3 lists the number of readings averaged for each
range and resolution when the power meter is in auto filter mode.
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