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Installation
Orientation
The connector face of the unit must point in the forward direction. The DMS drawing, with wire
call outs, is located in Figure 1. The DMS is a rugged device and will withstand harsh
environments. However, due attention needs to be paid to the nature of the sensor and its prime
function, which is to measure attitude and motion.
Mounting
The DMS-EGP01 has four 0.20" diameter mounting holes for 10-24 screws (See Figure 1). If high
shock loads are expected (greater than 20G or repeated shocks greater than 10G), appropriate shock
mounting should be used to prevent damage. Vibration isolation should be used if operation in 4G
or greater vibration environments is expected.
The GPS antenna has a magnetic mount with two M2.6 mounting holes and needs an unobstructed
view of the sky to receive signals from GPS satellites. The antenna needs to be mounted on a
minimum 6" x 6" ground plane. Nothing nearby the antenna can be higher than this ground plane.
Environment
Avoid mounting sites that are subject to significant temperature changes over the duration of the
test. Temperature variation will induce noticeable rate sensor bias drift, which will result in
degraded attitude accuracy.
Power / Connectors
This unit has an internal regulator to allow operation over a wide voltage input range. Best
operation is obtained at either 12 or 24 VDC, although operation is fully satisfactory down to 10
VDC and up to 30 VDC. Power draw of the unit is about 5.5 Watts. Internal capacitors are
provided to remove a reasonable level of power line noise, however, capacitors should be added for
long power line wiring or if noise is induced from other loads on the circuit. The DMS power
system is isolated from the DMS signal system. The mating connector for the Power/Analog
Output Connector is a 25 Pin female D-Sub.
Note: The signal ground is connected to case.
The SMA GPS antenna connector is on the side of the case. This type of connector should be
torqued to a maximum of 5 in-lbs. The GPS Antennas are supplied with +5 VDC, less than 40mA
each. The minimum gain requirement for these antennas is 20 dB. For more information on the
connectors and pinout of the DMS-EGP01, see Figure 1.
Calibration
The DMS is calibrated at the factory before it is shipped to the user. It is recommended that the
unit be returned to the factory annually for evaluation and recalibration.
Operation
Initialization
Ideally, the DMS should be stationary and level when it is turned on. If not, the sensor readings
may not be accurate for after initialization. The time required for the initialization process is not
Watson Industries, Inc.
DMS-EGP01 Rev A 02/12/2015
4
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