DVM-500 User’s Guide Digital In-Car Video System
Digital Ally DVM User Guide Rev. F (334/1.6.2) Page 28 of 36
Speedometer Menu
Speedometer Type
This setting should be set to the make of the vehicle. If the vehicle
make is not available, use the Custom setting.
Pulses/Unit Distance
Use this setting to enter the number of pulses per unit distance output
from the vehicle speed sensor (VSS) on the vehicle (see the vehicle’s
Modifier Guide for the proper value, or use Automatic Calibration).
The unit distance is typically miles but can vary depending on vehicle.
Input Waveform
Enter the waveform type that is output from the VSS.
Automatic Calibration
If the correct Speedometer Type is not listed, or if the Pulses/Unit
Distance is not known, then use Automatic Calibration to configure
these options. To automatically calibrate the recorded speed of the
vehicle, select this option and follow the on screen instructions:
“Maintain Constant Speed of 60 and Press SELECT To Begin” (60 is
in MPH or KPH and SELECT is the ZOOM/2 button).
Radar Patrol Speed
This is the vehicle’s speed as read from the radar interface via an
optional radar interface cable attached to DVM’s interface box. Radar
Patrol Speed can be used to verify that attached radar equipment is
communicating with the DVM.
Calculated Speed
The DVM will calculate vehicle speed based on the number of pulses
received from the vehicle’s VSS.
Pulses per Second
Pulses received from the vehicle’s VSS. This can be used to verify that
the DVM is communicating with the vehicle’s VSS.
Speedometer Type FORD, GM, CUSTOM FORD
Pulses/Unit Distance 100 to 99999 8000
Input Waveform Square, Sine Square
Automatic Calibration NA NA
Radar Patrol Speed:
Displays vehicle speed from the
radar unit
NA
Calculated Speed:
Calculated vehicle speed based
on the VSS input
NA
Pulses per Second:
Pulses received from the VSS
input each second
NA
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