Vaisala RVP900 - Main Computer; IFDR Module

Background
RVP900 can output up to 12 triggers. These can be delayed by dierent amounts, and have
dierent pulse widths. For example, trigger 0 may go to fire the transmitter, while a slightly
delayed trigger 1 may be used for triggering an oscilloscope. The timing can be dierent for
each transmitter pulse width. The final timing adjustments are configured in A.16 Burst Pulse
Alignment (page 354).
In the following table, enter the purpose of each trigger, the nominal start time, and pulse
width. Start times are relative to range zero (middle of the burst pulse). We recommend a
nominal pulse width of 3 μsec.
Magnetron radars using an analog COHO system often have a trigger generator circuit,
which produces a trigger for the COHO latching, and also for the transmitter pulse. This
circuit should be bypassed in an upgrade.
#
Purpose Start Time Pulse Width
0 ________ ________ ________ ____ μsec ____ μsec
1 ________ ________ ________ ____ μsec ____ μsec
2 ________ ________ ________ ____ μsec ____ μsec
3 ________ ________ ________ ____μsec ____ μsec
4 ________ ________ ________ ____ μsec ____ μsec
5 ________ ________ ________ ____ μsec ____ μsec
6 ________ ________ ________ ____μsec ____ μsec
7 ________ ________ ________ ____μsec ____μsec
8 ________ ________ ________ ____μsec ____ μsec
9 ________ ________ ________ ____μsec ____ μsec
Test Procedure
1. Enter the TTY setups through dspx.
2. Issue the Mt command to display the internal status.
3. Set all the values, as required, for your operation.
ThePRF and pulse width set here are the current values and the values used at
power up.
RVP900 User Guide M211322EN-J
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