User's Manual

DIGITAL CONTROL INCORPORATED
DigiTrak Falcon

F2

Operator’s Manual 23
Use AGR at least daily, and ideally in both frequency bands, to verify proper depth (distance)
measurements.
After Calibration
If necessary, turn Height-Above-Ground (HAG) back on.
Height-Above-Ground (HAG)
Page 17
15 m Calibration (Optional)
This feature is only used for verifying above-ground AGR distance measurements beyond
12.2 m. A 15M (15 meter) calibration does not affect depth readings on the Locate screen.
Only a 1PT 3 m calibration is necessary for below-ground depth readings.
Above-ground distances beyond 12.2 m may read shorter than normal due to what is known
as "surface effects." Varying amounts of conductivity in the surface of the earth make
distance readings read shallower than actual, with the amount of error varying with ground
conditions.
If you have completed a 1PT 3 m calibration and AGR distances beyond 12.2 m are reading
short, perform a 15M calibration (which also uses only one point) to refine the AGR
measurement.
Note If the AGR reading at 15 m is less than 13.7 m or greater than 15 m, this
calibration will fail.
The 15M calibration does not properly correct for active or passive
interference.
1. Follow the same procedure as described for 1PT calibration in Calibration and AGR on
page 20, but at the calibration screen mentioned in step 3, select 15M instead of 1PT.
2. Follow the remainder of the procedure, including conducting an AGR test.
Do I have to do a 15M calibration before I can drill?
No. A 15M calibration only helps with above-ground measurements. Use it if the AGR test reveals
shorter than actual distance readings beyond 12.2 m. After the 15M calibration, use the
subsequent AGR test to verify the adjusted distance readings.