PULSEVehiclePass‐byTestSystems – InstallationManual
2
Fig.1.1 shows an overview of a pass-by test system. The typical configuration is a multi-
vehicle configuration using both the Ground Station and Vehicle Station to acquire and
measure both pass-by and in-vehicle data.
On the Ground Station, PULSE measures all acoustic channels, speed measurements
and triggering signals. Photocells provide measurement triggering and an absolute
position reference for distance calculations.
You can also add the following accessories for optional measurement parameters:
• A digital weather station to measure atmospheric conditions to qualify and
document the measurement
• A 2-channel radio telemetry system for transferring engine speed and/or vehicle
speed from the vehicle
• A speed sensor such as a radar or precision GPS to continuously measure the speed
of the vehicle(s) under test
Pass-by Connection Module WB-3595 in the Ground Station’s front end, powers and
conditions the inputs from the photocells and radar when used.
The Vehicle Station measures in-vehicle data such as engine RPM, vehicle speed if an
on-board speed sensor is available, and other in-vehicle data.
Both stations require a PC to be connected to them to control and operate
measurements using the PULSE Vehicle Pass-by software.
1.2 SystemOperation
During the test, the sound pressure levels are measured by microphones connected to the
Ground Station. The results are calculated and saved at the Ground Station. If there is a
Vehicle Station present, the data from the Ground Station is uploaded to the Vehicle Station.
If the Ground Station is used alone, then it measures all data and calculates the results.
If both a Ground Station and Vehicle Station are used, in-vehicle channels such as engine
speed and throttle position, vehicle speed and any other type of onboard, measured
data are acquired by the Vehicle Station. The Ground Station data is transferred to the
Vehicle Station where it is synchronized and merged with data on the Vehicle Station
directly after each run. The pass-by result is then calculated.
Systems with both Ground and Vehicle Stations transfer data between the PCs using
wireless LAN (WLAN). See Chapter 6 for setup instructions.
