Vaisala RVP900 User Manual

Chapter 5 _______________________________________________________ Plot-Assisted Setups
VAISALA______________________________________________________________________ 169
5.5.3 TTY Information Lines Within Pr
The TTY information lines resemble:
Zoom:x1, Navg:4, Start:0.00 usec (0.00 km), Span:5 usec
Total:-63.3 dBm, Filtered:-77.6 dBm, MidSamp:-77.4 dBm
The computation of "Total Power" is performed using the same subset of
central IF samples that are used to compute "Filtered Power". This smaller
subset of IF samples comes about because filtering the data requires a
convolution with the current FIR filter, and this computation does not
> and < The live plotted data can be logged to the
$(IRIS_LOG)/rvp9–pr.log text file, one line per plot.
% Toggle between all five IFDR IF-Input sources.
Zoom Indicates the magnification (in amplitude) of the plotted
samples. A zoom level of "x1" means that a full scale A/D
waveform exactly fills the vertical height of the plot.
Generally, the IF signal strength will not be quite this high.
Thus, use larger zoom levels to see the weaker samples
more clearly. You may zoom in powers of two up to x128.
Navg Indicates the number of spectra and/or LOG powers that
are averaged together prior to plotting. Larger amounts of
averaging increase the ability to observe subtleties of the
signals, but the display will update more slowly.
Start Indicates the starting time of the IF sample window relative
to range zero. The time is shown both in microseconds and
in kilometers.
Span Indicates the time span of the IF sample window in
microseconds.
IF Indicates which of the five IF-Input sources (SMA edge
connectors) is providing the data being plotted.
Total Indicates the total RMS power that is being detected by the
IF-Input A/D converters. This total is computed using all
of the raw IF samples in the chosen interval, and is the sum
of power at all frequencies other than 0 Hz (and its aliases).
Filtered Indicates the RMS power that falls only within the
passband of the FIR filter for the current pulse width. This
is computed using all of the raw IF samples in the chosen
interval.
MidSamp Also indicates the RMS power within the passband of the
FIR filter, but using only the raw IF samples in the exact
center of the chosen interval.

Vaisala RVP900 Specifications

General

Brand	Vaisala
Model	RVP900
Category	Receiver
Language	English