31sensor is where the rebar is in (figure3-11(C)).2) Rotating the sensor and making the signal in maximum state. Atthat time, the direction of sensor is the direction of testedrebar.(figure3-11(D))4. Measurement of rebar diameter1) Resetting sensor in accordance with the method 2 .2) Identifying rebar’s location and direction precisely.3) Placing the sensor above the tested rebar and paralleled with it.Pressing 【 】 key, after about 2 seconds, the tested result ofdiameter will be directly shown in the position of “Dia”. Theinstrument will measure the thickness of cover simultaneouslyshown in “Cover” in figure 3-12. Under the mode of automaticstorage, it will store diameter value and thickness of coverautomatically and the storage amount increase by 1. Under themode of manual storage, if pressing 【SAVE 】, it will storediameter and thickness of cover and the storage amountincrease by 1.Figure 3-12 Rebar diameter test3.4.2 Grid-scanGrid-scan mainly displays the distribution of grid-distributed rebarthrough grid diagram, and display the location of rebar and thethickness of cover at the same time.Operation manual of NOVASCAN-R800, R630, C310ANovatest S.r.l. www.novatest.it