Honeywell IntuVue RDR-4000, Руководство пилота

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IntuVue RDR-4000 Weather Radar Pilot's Guide
D201002000008 Expanded Operating Instructions
Rev 1, December 2014 25
GAIN CONTROL (GAIN)
GAIN control is active in all modes. The
calibrated (AUTO) position is the only
position where the colors represent the
FAA defined reflectivity and rainfall rates
as shown in the table below. The AUTO gain setting provides a
standard reference which all radar manufacturers must follow.
Immediately after turning the GAIN control in either direction out of the
detent position (AUTO), the “MAN GAIN” annunciation appears on the
display indicating that the system is no longer in the calibrated mode.
Rotating the GAIN control counterclockwise decreases gain. Rotating
the GAIN control clockwise increases gain. The gain setting has no
effect on turbulence detection or display. After using gain to assess the
weather, the GAIN knob should be returned to the AUTO position.
Reflectivity Color Codes (Gain at AUTO)
Color Returns Reflectivity Rainfall Rate
Black
Very light or
none Less than
20 dBZ Less than 0.7 mm/hr
(0.028 in/hr)
Green Light 20 – 30 dBZ
0.7 – 4 mm/hr
(0.028 – 0.16 in/hr)
Yellow Medium 30 – 40 dBZ
4 – 12 mm/hr
(0.16 – 0.47 in/hr)
Red Strong
40 dBZ or
greater Greater than 12
mm/hr (0.47 in/hr)
Magenta Turbulence N/A N/A
Rotating the GAIN Knob to the minimum (MIN) position reduces gain by
approximately 16 dBZ. Rotating the GAIN Knob to the maximum (MAX)
position increases gain by approximately 10 dBZ.
Proper use of the gain control can aid in the detection and assessment
of storm cells. Gain reduction can be useful in several ways. Reducing
the gain to MIN provides a quick assessment of the relative intensity
between displayed cells. Since gain does not affect turbulence
detection, reducing gain in the AUTO mode to MIN will show turbulence
information along with the strongest cells. This is important since the
presence of turbulence along with high levels of reflectivity often
indicates convective weather. In areas of heavy stratus rain, the display
can show large areas of strong returns, but with little associated
turbulence.