Doc. P/N:
WSP-009-008
Version: V1.3
Issue Date: April 2014
Operator Manual
Utility Panel
39
6.7.1.1 Key Pulse Graph
The Key Pulse Graph shows the state of the input key pulse according to how the WASSP system has
interpreted it. The WASSP detects changes between input states, and draws those on the graph at the
point of the ping time where the state change is detected.
When enabled, the KP Graph replaces the “I” data stream on the IQ Raw Data tab, and is the same
regardless of the selected channel.
Note: The KP Graph is not an oscilloscope. It will not show the raw KP voltage.
The graph is only indicative of key pulse state changes detected during the WASSP
data acquisition time, and may not draw pulses less than 0.3ms in width. The polarity
drawn on the graph may not correspond to the input polarity.
Figure 19 shows an example
where the WASSP is operating in
Slave Mode
. The first key pulse
visible has triggered the WASSP
system to ping and collect data.
During the data collection, a
second key pulse was detected,
but this did not trigger another
ping, as the WASSP system was
still acquiring data. The WASSP
system will wait until the next
key pulse after data acquisition
for the current ping has finished
before pinging again.
Figure 20 shows an example of
the WASSP system operating in
Master Mode
or
Rx Blanking
Mode
. Here, the WASSP system
is pinging at its native rate,
ignoring the input key pulse. The
WASSP ping is not synchronised
with the input key pulse.
WASSP Data Acquisition Time
Figure 20. Unsynchronised Key Pulse Input
(Master / Rx Blanking Mode)
Ensure the input key pulse from the secondary sounder has
been correctly installed according to the pin configuration on
page 19 of the WMB-X230 Installation Manual.
Figure 19. Synchronised Key Pulse Input
(Slave Mode)
WASSP Data Acquisition Time
Detected key pulse /
state change
Tick “KP Graph” to
enable the display
