Vaisala RVP900 - Initial Setup of Information for each Pulse Width; Table 95 General Trigger Setup Checklist

Checklist
Table 95 General Trigger Setup Checklist
Task Checked OK/Not OK Remarks
Test procedure completed successfully.
Parameters set
See 5.2.5 Mt — General Trigger Setups (page 113).
Test Passed
For Customer Date:
For Vaisala Date:
A.11 Initial Setup of Information for Each
Pulse Width
Test Goal
Enter the initial values for the TTY Setups for each of the pulse widths.
The
final values of trigger timing, FIR filter impulse response length, and bandwidth are
adjusted later.
Background
The duty cycle of the transmitter is the product of the PRF and the pulse width in seconds.
For example, a PRF of 1000 Hz and 1 microsecond pulse width is a duty cycle of 0.001. Thus
a transmitter with a 0.001 duty cycle limit could function at 1000 Hz and 1 microsecond
pulse width, or 500 Hz and 2 microsecond pulse widths.
The duty cycle limits of your radar should be obtained from your system documentation or
radar manufacturer. RVP900 supports up to four pulse widths (coded 0 to 3), although most
transmitters typically support only 2 pulse widths. Record, in the chart below, the pulse
width in microseconds and the maximum PRF that is allowed for each pulse width.
#
Pulse Width Max PRF
0 ____ μsec ____ Hz
1 ____ μsec ____ Hz
2 ____ μsec ____ Hz
Appendix A – Installation and Test Procedures
349