Long-Term Pavement Performance Program Manual for Falling Weight Deflectometer Measurements
11 COLD WEATHER FWD TESTING
The FWD tow vehicle should be warmed to achieve an interior temperature of at least 5 °C (40 °F) before turning on the signal processor or data collection computer.
For testing in ambient temperatures at or below −10 °C (15 °F), the standard hydraulic fluid should be replaced with a lighter-weight synthetic fluid or other oils as recommended by the manufacturer. Some oils may not be appropriate for warm-weather operations.
