measurements of the special samples should be taken with both
the “master” and “field” gauges.
After the cross calibration is completed, calibrations performed
on the “master” gauge can be transferred to the “field” gauges
without additional “field” gauge calibrations. This transfer is
performed by entering the “master” gauge background count
and calibration constants into the “field” gauges. Based on the
cross calibration data, the constants will be adjusted to reflect the
differences between the “master” gauge and each “field” gauge.
Cross Calibration
If a cross calibration has already been performed go to page 7-14
for information on transferring a calibration.
The following steps must be performed prior to transferring a
calibration from a “master” gauge to a “field” gauge.
Prepare a minimum of five cross calibration samples. Refer to
Chapter 4 for detailed instructions on preparing asphalt samples
for calibration. These samples must be prepared with one
sample containing at least 0.5% asphalt above the range of all the
mixes used and one sample with 0.5% asphalt below the normal
range.
Set the count time to 16 minutes.
On the “Master” Gauge
1. Press 〈CALIB〉.
2. Take a new background count and record the value.
3. Perform a calibration with the five samples.
4. Record the counts obtained on each sample.
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