Optional Accessories; Optional Hardware; Distance Measuring Instrument; Global Positioning System - Dynatest FWD Owner's Manual

18.1 Optional Hardware

A variety of optional accessories are available for the Dynatest FWD and HWD Test Systems.
Unless otherwise stated these will apply for the FWD as well as for the HWD.

18.1.1 Distance Measuring Instrument

Distance information may be generated by the CP15 or by devices connected directly to the
PC. A DMI provides automatic display and recording of distance information (in English or
Metric units).
Trailer Mounted
Distance Measuring is accomplished by a Trailer mounted two phase encoder system
connected to the Compact 15. Approximate resolution 0.15 m or 0.5 ft. Accuracy 0.4%
when calibrated using the procedure in the DMI applet.
Vehicle Mounted
Distance Measuring is accomplished by a vehicle mounted encoder or by tapping into the
vehicle's speedometer/odometer circuit. Distance pulses are processed by an adapter
(EncIf/EnCam), which connects to the PC using a USB port. The DMI Applet carries out
calibration and control.

18.1.2 Global Positioning System

A GPS unit may be connected directly to the CP15 or to the PC using a COM (serial RS232)
port. Most laptops require a "Serial to USB" converter due to lack of built in COM ports. The
GPS unit must be set to 2400, 4800, 9600, 19200 or 38400 baud. Alternatively, an Ethernet
enabled GPS receiver may connect directly to a Network switch inside the vehicle.
The GPS unit must be set to send the NMEA standard message "GGA". The maximum
reporting rate is 10 Hz. At this rate you must assure that no other messages are sent from the
GPS unit.

18.1.3 Air/Pavement Temperature Probe

A Temperature Monitoring Probe, for automatic recording of Air Temperature and/or
Pavement Temperature (in a drilled hole in the pavement, to get pavement MEAN
temperature). Electronic (integrated circuit) sensing element in a stainless steel probe. Mounts
on the FWD/HWD Unit in a special holder with air circulation and connects to the
Compact15. Resolution 0.5 deg. C, accuracy within +/- 1 deg.C (in the -18 to +70 deg.C
range) when properly calibrated using provided procedure in the Temperature Applet.

18.1.4 IR Surface Temperature Transmitter

A non-contact, Infra-Red Temperature Transmitter, for automatic recording of pavement
SURFACE temperature ONLY. Features an integrated IR-detector and digital electronics in a
weather-proof enclosure. Mounts on the FWD/HWD Unit and connects to the Compact15.
Resolution 0.5 deg.C, accuracy within +/- 1 deg.C (in the -18 to +70 deg.C range) when
properly calibrated using provided procedure in the Temperature Applet.
18-150

18. Optional Accessories

2017.06.19 FwdMan2.8.17.docx