Nautel XR12, Operation And Maintenance Manual

Page: 42 / 81

XR12 Operations and Maintenance Manual Operating the transmitter
Issue 3.1 2013-03-14 Page 2-17
Figure 2.12: Calibrate Clock page
To change the highlighted Current RTC (real time clock) Calibration value, press the
Edit
button,
then press the
Up
or
Down
button to increase or decrease the value. As you change the value, you
can also observe changes to the other fields:
• Estimated FT Frequency: Displays the estimated FT (frequency test) frequency, in Hz, for
the Current RTC Calibration value.
• Effective 30-day Correction: Displays the absolute number of seconds that the clock will
gain (positive value) or lose (negative value) over a 30-day period for the Current RTC
Calibration value.
• Previous 30-day Correction: Displays the absolute number of seconds that the clock will gain
(positive value) or lose (negative value) over a 30-day period for the previously set value of
Current RTC Calibration.
• Delta 30-day Correction: Displays the difference between the Previous 30-day Correction
and the Effective 30-day Correction to facilitate a subsequent adjustment from the previous
setting.
Press the
Save
button to store the change. Press the
Cancel
button to abort the change.
Two procedures are included to calibrate the transmitter’s clock:
• 30-Day Drift Estimation - see page 2-18
• RTC Frequency Measurement - see page 2-18 .
10:18 0.00kW M-1 PM:AB Man Ex:A Man
8
Edit Back
10:18 0.00kW M-1 PM:AB Man Ex:A Man
Current RTC Calibration:
Edit Back
Estimated FT Frequency: 512.008 Hz
Effective 30-day Correction: -42.2 sec
Previous 30-day Correction: -42.2 sec
Delta 30-day Correction: 0.0 sec
10:18 0.00kW M-1 PM:AB Man Ex:A Man
8
Edit Back
10:18 0.00kW M-1 PM:AB Man Ex:A Man
Current RTC Calibration:
Edit Back
Estimated FT Frequency: 512.008 Hz
Effective 30-day Correction: -42.2 sec
Previous 30-day Correction: -42.2 sec
Delta 30-day Correction: 0.0 sec