Preliminary Remarks
These operating instructions refer to the factory settings of the ZFG 3.0, ZFG 3.1 and ZFG 3000 units.
If
you make changes to the settings yourself, the properties described here may differ. Crossreferen-
ces are inserted in the relevant sections, which will take you to the information.
Light Weight Deflectometers ZFG 3.0, ZFG 3.1 and ZFG 3000 are the current generation of precision
deflectometers introduced by ZORN INSTRUMENTS in the early 1990s.
German Technical Test Specification for Soil and Rock in Road Construction TP BF-StB Part B 8.3
(2012) has been revised several times since its initial publication. Since latest revision, regulations on
calibration have been part of a separate specification, TP BF-StB Part B 8.4 (2016).
Outside Germany, TP BF-StB Part B 8.3 (2012) serves as a guide for the application of the Light
Weight Deflectometer. However, a growing number of countries have now also published their own
national standards. The following specifications are examples of this:
Austria: RVS 08.04.04 (March 2008)
Switzerland: VSS 70 313 (July 2019)
Belgium: SB 250 versie 4.1, 4.16.2 (April 2019)
Spain: UNE 103807-2:2008 (July 2008)
USA: ASTM E2835 - 11 (2020)
China: TB 10001-2016 (Design Guidelines Railroad Substructure)
Russia: N° 52068-12 (State Register of Approved Measuring Instruments)
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