Troxler NTO
6–7
6. CALI
BRA
TION
CALCULATING AN ACF
1.
Using the following equation, calculate and record the aggregate
correction factor for each correction sample:
ACF =%AC
0
– %AC
T
where:
ACF
= Aggregate correction factor
%AC
0
= Asphalt content of sample as determined by the
oven
%AC
T
= True asphalt content
2.
Determine the average ACF value (
ACF
AVG
) as follows:
f
If the difference between the two ACF values is less than
0.15%, then average the two values.
f
If the difference between the two ACF values is greater than
0.15%, then prepare two additional correction samples.
Discard the high and low ACF values, then average the two
remaining values.
3.
Enter the ACF as described in the
Create ACF
section on page
6–10. The oven will automatically adjust the asphalt content
measurements using the active ACF.
Summary of Contents for NTO 4730
Page 10: ...x LIST OF TABLES Table Title Page 4 1 Oven Keys 4 3 5 1 Recommended Minimum Burn Times 5 6...
Page 30: ...2 10 NOTES...
Page 90: ...5 36 NOTES...
Page 110: ...6 20 NOTES...
Page 136: ...Appendix A 16 NOTES...
Page 148: ...Appendix C 6 NOTES...
Page 156: ...Index 8 NOTES...
