SubSurface Instruments AML PRO Operator's Manual page 18

> CALIBRATE
(Radio Frequency Calibration)
The CALIBRATE function recalibrates
the RF Board from backup files in the
microprocessor. CALIBRATE returns
the RF Board to its original condition.
Use the following procedure to
calibrate the RF Board:
1. With the unit outside, use the
UP or DOWN arrows to highlight
CALIBRATE.
2. Press SEL Button. The 0 in the
CALIBRATE field will turn to 1.
3. Press MENU Button to exit the
CALIBRATE field and to save the
setting.
NOTE: Once the CALIBRATE procedure is
selected the procedure must be completed
within 10 seconds, otherwise the process
will time out and return to the MENU
screen.
4. The MENU screen will return
to the MAIN screen. Check the
DEG Status Line on the MAIN
screen and hold the unit at a 45
degree angle (± 10 degrees) to
an unobstructed sky within 10
seconds.
5. The MAIN screen will show a WAIT
message. Hold the unit still while
pointed at an unobstructed sky and
allow it time to recalibrate.
6. Once the unit is recalibrated the
MAIN screen will show a PASS or
FAIL message.
7. Repeat the procedure if a FAIL
message is indicated.
18
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T i me zone set
>
Cal i brate
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backl i ght off/on
RTC 16 27 57
Figure 18-1
RTC 16 27 57
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RTC 16 27 57
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Figure 18-2
RTC 16 27 57
RTC 16 27 57
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> BACKLIGHT ON/OFF
Use the UP or DOWN arrows to place
the cursor on BACKLIGHT ON/OFF.
Press the SELECT Button to change
the 0 to 1 to turn the BACKLIGHT OFF.
The BACKLIGHT can be turned ON
or OFF. Turning the BACKLIGHT OFF
helps conserve battery power. Press the
MENU Button to save the setting.
T i me zone set
Cal i brate
>
backl i ght off/on
Figure 18-3
RF test
wait
00
0
pass
1
fail
RF CAL
RF test
RF test
RF test
wait
wait
wait
pass
pass
pass
fail
fail
fail
RF CAL
RF CAL
RF CAL
00
0
1