ASTM E2835 – 11 Standard Test Method for Measuring Deflections using a Portable Impulse Plate Load Test Device
Scope: This test method applies to measuring plate deflections using a Portable Impulse Plate Load Test device. The method covers the measurement of deflection of the load plate rather than the deflection of the surface of the pavement or foundation layers

ASTM E2583 – 07(2011) Standard Test Method for Measuring Deflections with a Light Weight Deflectometer (LWD)
Scope: This test method covers the determination of deflections of paved and unpaved surfaces with a Light Weight Deflectometer (LWD). This device is also referred to as a Portable Falling-Weight Deflectometer (PFWD). The LWD is lightweight, portable and generally used for testing unbound pavement layers. The deflections measured using an LWD can be used to determine the stiffness of bound and unbound pavement surfaces using appropriate back- or forward calculation analysis techniques.

TP BF-STB PartB 8.3_97 German Road Standard Dynamic Plate-Load Testing with
the aid of the Light Drop Weight Tester