Laserfiche WebLink
<br />IY. FIELD OPERATING PROCEDURE FOR THE 3411 <br />1) Turn gauge on far 10 minutes to allow regulators and detectors to <br />stabiii ze. <br />2) Take Standard Counts. <br />A. Plate standard on a solid surface with density of 1600 Kg/M3 <br />(100 PCF) or greater such a5 compacted soil, asphalt, or con- <br />crete. The gauge should be at least 3 meters or 10 feet from <br />any large object such as a vehicle or wall, There should not <br />be another gauge within 10 meters or 30 feet. <br />(The standard is a 6 Kg (12 Ib) pal yethel ene block supplied <br />with the gauge.) <br />B. Place gauge on standard, scaler end against the metal plate, <br />between the raised edyes. Re sure the gauge is properly <br />seated on [he recessed surface of the gauge. <br />C. Remove pad lock that locks source rod in "Safe" position, <br />leaving the source rod in the "Safe" position (COD notch). <br />D. Turn the Power/Time switch [o the Slow (4 minute position). <br />Press SHIFT and STANDARD keys on the keypad simultaneously. In <br />the disDl ay window, you will see gauge counting and ERR in the <br />upper left hand corner. <br />E. After 4 minutes, the counting will stop. Both of these counts <br />are stored in the gauge's computer memory. Press OS key and <br />record your Density Standard Lount. Press NS and record your <br />Moisture Standard Count. <br />F. Return the Standard Block to [he case. <br />G. Record Standard Counts in Loq Book <br />NOTE: io verify gauge stability, [he day to day log of moisture and <br />density standard counts is used to compare the standard count <br />with prev taus counts. <br />Assuming [he instrument is new or Just retalibrated, the <br />percentage limits are as follows: <br />x2% each day [he first four (4) days for OS (Density <br />Standard) as canpare0 to the factory calibrated value. <br />i4% each day the first four (4) days for MS (Moisture <br />Standard) as compared to the factory calibrated value. <br />After four (4) daily standard taunts, standard counts are <br />compared up against the average of the previous four, and the <br />following percentages apply: <br />tl% for OS <br />x2% far MS <br />This averaging procedure is maintained until the instrument 1s <br />returned to the factory for recal ibration. Reca116rat1on, <br />requires the l09 procedure to be started over. Standard count <br />log sheets may be found on the last pages of this manual. In <br />the event of standard counts not falling into the above <br />percentages, an instability is suspected. Refer to page 25, <br />Section I%-D, Statistical Stabll ity and Drift. <br />3) Density and Moisture Testing <br />Dn Sofl and Base Courses <br />A. If surface is not relatively smooth, use [he scraper plate pro- <br />vided with the gauge to smooth the surface. (Sand or native <br />floes may be used to fill voids.) <br />B. Using drill rod and dill rod 9ui de Drmvi ded with the gauge, <br />drive a hole at least 50 mm (2") deeper than desired test <br />depth, If the drill rod extraction tool is available, place <br />[he drttl rod through the extraction Cool into the uraper <br />plate guide. (If the hole is more than 50 mm~(2") 1t does noT <br />matter.) Remove drill rod by rotating and pulling straight up. <br />8- <br />