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Contact Us
421 E. El Segundo Blvd
El Segundo, CA
Tel: +1 310 322 1920
        +1 310 322 1922
Fax: +1 310 322 5146

Adaptive Control Algorithm
The JILS FWD utilizes advanced features for control. One such feature is to allow the operator to modify the required force levels via keyboard entry. The JILS force control system is the best in the industry and fully automated. This however creates a challenge when the structure under test changes either to a stiffer structure or a weaker structure. When this happens our advanced algorithm modifies the drop heights automatically to get the resulting load equal to the asking force. In fact the JILS FWD allows the operator to program multiple forces at one test location (Example, you can program a four drop sequence to have the same or varying loads).
Distance Measuring Instrument (DMI)
We have integrated the Nu-Metrics Nitestar NS60 DMI (RS232 Protocol) in to our FWDs in order that recording of distances (feet, miles, km) during testing is automatically written to the data test file.

Accuracy: +/- 1ft/mile
Special Functions: Changing units, setting a pre-distance, and changing directions
Video Monitoring System
For vehicle positioning and joint testing, a color video monitoring system from Accele Vision is included in the base price. A flip down video monitor that saves space and color video camera are mounted for efficient tow vehicle positioning for test location load transfer testing and monitoring.

Field Calibration Equipment

Both the force and the velocity transducers can be calibrated in the field, using equipment and features provided with each JILS machine. JILS systems may also be calibrated at one of the SHRP Regional FWD Calibration Centers.
Computer System
Typically included with your purchase of any JILS FWD is a laptop with the JTEST Software pre-installed for you. The laptops are easily removable from the in-vehicle computer mounting.

General Specifications
  • 80 gigabyte hard drive
  • CDROM Drive
  • 512 megabytes of RAM
  • 15" viewable screen
  • Active matrix
  • 56K modem
  • 10/100 Ethemet adapter
  • Pentium4 2.0 GHz processor or greater
  • 1.44" FD
  • Wireless Capability (available upon request)
Global Positioning System (GPS) (Optional)
As an option, GPS data can be automatically collected during testing and recorded into the test data file. Both the Trimble AGP132 sub-meter accurate GPS model and Trimble 3-meter accurate GPS model are available for integration.
Loading Pulse
Load Pulse Shape: smooth sine waveform (produced by 4-part mass buffer, falling weight hydraulic driven with independent motor that directly drives hydraulic pump)

Load Rise Time - 10 msec (milliseconds) minimum.
Load Pulse Duration: 20-34 msec
Meets ASTM and SHRP Standards for Falling Weight Deflectometers.
Force Measurement (Automatic Load Sensing)
The JILS system uses a precision Strainsert fatigue rated strain gauge load cell force transducer to measure the loading force. Our system automatically adjusts to user required pavement loading via our adaptive control algorithm.

Accuracy: 1% +/- 0.07kN (15 pounds)
Range: 0 to 120 kN (27,000 lbs) or 0 to 200 kN (45,000 pounds)
Material: Stainless steel
Loading Plate
12" (300mm) diameter Rigid Steel Disk with 5/16" neoprene pad for uniform loading distribution - best in class!
Power System
2 Cylinder, 18 horsepower gasoline engine directly drives the pump and the 12V alternator Benefit: FWD can operate independent of a tow vehicle and has enough power to operate at high speeds.
Loading Assembly
4-part mass system
4 buffer spring combinations
Displacement Measurement
JILSThe JILS uses up to nine digital grade velocity transducers to measure the deflection response of the test surface. These geophone-type (current industry standard) deflection sensors are positioned in a bar for automatic placement at user selected locations during testing. The bar will permit placement of two sensors aft and one sensor to either side of the loading plate in addition to all sensors forward of the loading plate. They are placed according to SHRP placements of 0 to 60 inches in 6 inch increments.
Accuracy: 2% +/- 1 micron (0.04 mils)
Deflection Sensor Range: 0 to 2032 microns (80 mils)
Deflection Resolution: 0.04 mils (1 micron)
Relative Accuracy of Deflection Sensors: +/- 0.25% (Federal SHRP Calibration - all 4 manufacturers adhere to this standard)
Temperature Measurement (Pavement) (Optional)
A non-contact, infrared, device is available as an option for measurement of the A non-contact infrared device by Omega is available as an option for measurement of the pavement surface temperature. This data is recorded automatically into the data file.

Accuracy: +/- 2% rdg
Range: -18 C to 400 C (0 to 750 F)
Temperature Measurement (Ambient)
A thermocouple device, also by Omega, is used for measurement of the ambient air temperature. This data is recorded automatically into the data file.

Accuracy: +/- 2% rdg
Range: 0-750 F
Automatic Load Sensing
Computer automatically determines drop heights for varying loads up to 99 drops.
Data Output
Data is outputted into AASHTO recommended file format Pavement Data Declection Exchange (PDDX) format.
Data Acquisition
1.25 Msamples/second
Up to 32 Differential A/D channels
2 Analog Outputs, 8 Digital I/O
+/- 10V Input Range
Custom Testing Programs
JILS can provide customized JILS FWD testing programs to meet such specific as may be requested.