4–2
TAKING A STANDARD COUNT
To adjust readings for source decay (see Appendix A) and natural
background radiation, take a daily
standard count
. A four-minute
daily standard count helps ensure the highest measurement
accuracy.
Locate the reference standard block shipped with the gauge. Always
take standard counts using the reference standard block.
Choose a standard count site. The standard count site should be:
♦
Dry and flat
♦
At least 3 meters (10 ft) from any large vertical surface
♦
At least 10 meters (33 ft) from any other radioactive source
♦
On asphalt, concrete, or compacted soil at least 10 centimeters
(4 in.) thick
Turn the gauge on. At the
Ready
display, press the
〈
STANDARD
〉
key. The gauge displays the last standard counts for density (DS)
and moisture (MS).
To take a new standard count, press
〈
1
〉
. To view the last four
standard counts, press
〈
2
〉
and scroll through the counts by pressing
the
〈
ENTER
〉
key.
When taking a new standard count, the gauge displays:
DS = xxxx xxxx
MS = xxxx
1- Take new count
2- View counts
Put Rod In STD Pos
Place Gauge On
Standard Block
Press ENTER
Summary of Contents for RoadReader Plus 3450
Page 7: ...Model 3450 vii NOTES...
Page 13: ...xii NOTES...
Page 17: ...1 4 GAUGE PARTS AND ACCESSORIES Figure 1 1 Model 3450 Parts and Accessories...
Page 23: ...2 4 Figure 2 1 Effect of Moisture on Depth of Measurement...
Page 53: ...3 28 NOTES...
Page 169: ...Appendix E 2 STANDARD COUNT LOG Gauge Serial Number Date Moisture MS Density DS1 Density DS2...
Page 171: ...Appendix E 4 STANDARD COUNT LOG Gauge Serial Number Date Moisture MS Density DS1 Density DS2...
Page 173: ...Appendix E 6 STANDARD COUNT LOG Gauge Serial Number Date Moisture MS Density DS1 Density DS2...
Page 175: ...Appendix E 8 STANDARD COUNT LOG Gauge Serial Number Date Moisture MS Density DS1 Density DS2...
Page 181: ...Appendix G 4 NOTES...
Page 187: ...Appendix H 6 NOTES...
Page 199: ...Index 12 NOTES...
