TM 5-6635-386-12&P Tester will commence slow "beep" during count. e. Tester will "beep-beep" fast at end of count. Press DENSITY DATA or MOISTURE DATA key to read count from tester. Record this on the Field Data Worksheet. NOTE DA  Form  5450-R  (Moisture  and  Density  Field Test   Sheets)   (an   abbreviated   version   of   DA Form 5448-R) can be found at the back of this TM. Moisture   is   taken   at   all   times   during   any   density count The moisture source is separately mounted within the tester.  Only the density source is in the source rod. The    moisture    reading    taken    in    the    BS    position    is recorded on the worksheet. f. If    a    density    only    or    moisture    only    count    is required,  press  the  D-ONLY  or  M-ONLY  keys  to  take only  the  desired  count.    The  other  prior  count  will  be saved in memory. 1-22. FIELD COUNTS, TRANSMISSION AND MOISTURE a. Site  is  prepared,  standard  count  recorded,  hole drilled. b. Seat tester over hole and insert source per Para 1-19. c. Insure  that  handle  is  firmly  in  the  desired  depth slot. d. Firmly  pull  tester  back  against  the  hole  to  seat the source against the hole wall. e. Depress the desired time key. f. Record the data from density data displays. 1-23.    DETERMINE  DENSITY  AND  MOISTURE  FROM CALIBRATION CHARTS Para 1-7 describes the use of a ratio for determination of the final values, the ratio serving to cancel out long term drifts from source decay or component aging. It is now necessary to record the field count data and to divide that data by the recorded standard count to obtain the  desired  ratios.    The  ratios  will  then  be  taken  to  the appropriate    calibration    charts    to    determine    the    final answers. Calibration   charts   are   provided   by   the   manufacturer (CPN)   with   the   tester.      The   charts   are   also   titled   to indicate  the  purpose  of  each  chart;  backscatter  density, backscatter-moisture,    transmission    at    "2",    etc.        The charts   are   also   identified   with   a   serial   number   which matches  the  serial  number  of  the  tester.    Charts  and testers are not interchangeable. RATIOS DENSITIES 0 246 127.00 0.243 127.50 0.240 128.00 0.238 128.50 0.235 129.00 0.232 129.50 Figure 1-8. NOTE The ratios listed in the left column cross over to the  densities  listed  on  the  right.    For  example, the ratio 0.240 crosses over to 128, which is the density in pounds per cubic foot weight (PCF).  If the ratio was calculated to be 0.239, which is not listed,  the  ratio  would  then  have  to  be  rounded up  or  down  (usually  down)  to  the  closest  listed ratio so the density can be determined. The   following   portion   of   DA   Form   5448-R   (Fig.   1-9) provides  data  for  a  typical  density  test  using  a  tester  at three  sites  on  a  project  and  with  three  depths  taken  at each  site.    The  average  of  the  three  readings  will  be used as the final evaluation density for the project. 1-17