Vaisala RVP900 User Manual

Chapter 4 _____________________________________________________ TTY Nonvolatile Setups
VAISALA______________________________________________________________________ 119
4.2.5 Mt<n>— Triggers for Pulsewidth #n
These questions are accessed by typing Mt, with an additional argument
giving the pulse width number. They configure specific trigger, transmit
waveform, and FIR filter properties for the indicated pulse width only.
These parameters list the starting times (in microseconds relative to range
zero), the widths (in microseconds), and the active sense of each of the six
triggers generated by the internal trigger generator. Setting a width to zero
inhibits the trigger on that line.
The Start Time can include an additional term consisting of the pulse
period times a fractional multiplier between -1.0 and +1.0. This allows you
to produce trigger patterns that would not otherwise be possible, for
example, a trigger that occurs half way between every pair of transmitted
pulses, and remains correctly positioned regardless of changes in the PRF
Enter this multiplier as "0" if you do not wish to use this term, and it will
be omitted entirely from the printout.
In the above example, Trigger #2 is a 10.0 µsec active–high pulse whose
leading edge occurs precisely halfway between the zero–range of every
pair of pulses. Similarly, Trigger #6 is a 2.0 µsec active–low pulse whose
falling edge is nominally 5.0 µsec prior to range zero, but which is
advanced by 1.0 µsec for every millisecond of trigger period. All other
triggers behave normally, and have fixed starting times that do not vary
with trigger period.
Some subtleties of these variable start times are:
- The PRT multipliers can only be used in conjunction with the
RVP900 internal trigger generator. The PRT–relative start times are
Trigger #1 Start: 0.00 usec
#1 Width: 1.00 usec High:YES
Trigger #2 Start: 0.00 usec + ( 0.500000 * PRT )
#2 Width: 10.00 usec High:YES
Trigger #3 Start: -3.00 usec
#3 Width: 1.00 usec High:YES
Trigger #4 Start: -2.00 usec
#4 Width: 1.00 usec High:YES
Trigger #5 Start: -1.00 usec
#5 Width: 1.00 usec High:YES
Trigger #6 Start: -5.00 usec + (-0.001000 * PRT )
#6 Width: 2.00 usec High:NO

Vaisala RVP900 Specifications

General

Brand	Vaisala
Model	RVP900
Category	Receiver
Language	English