Vaisala RVP900 - TTY Information Lines in Pr; Table 40 Pr TTY Information Lines

Command Description
Z/z
Zooms the amplitude of the IF samples by factors of two from one to 128. The LOG
plots are shifted in corresponding 6 dB increments as the amplitude is zoomed up and
down. The zoom level is reported on the TTY so that absolute power levels and A/D
usage can be assessed.
< space >
The space bar alternates among three choices for the type of data that are plotted:
Received Samples, Received Samples and LOG Power, and Received Power Spectrum.
> and < The live plotted data can be logged to the $(IRIS_LOG)/rvp9–pr.log text file,
one line per plot.
%
Toggle between the IFDR IF-Input sources.
6.7.3 TTY Information Lines In 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
Table 40 Pr TTY Information Lines
Information Line Description
Zoom
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 is not be quite this high. Use larger zoom
levels to see the weaker samples more clearly. You may zoom in powers of
two up to x128.
Navg
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 updates more slowly.
Start
The starting time of the IF sample window relative to range zero. The time
is shown both in microseconds and in kilometers.
Span
Time span of the IF sample window in microseconds.
IF
Which IF-Input sources (SMA edge connectors) is providing the data
being plotted.
Total
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
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
The RMS power within the passband of the FIR filter using only the raw IF
samples in the center of the chosen interval.
Chapter 6 – Plot-assisted Setups
159