Calibration information for the Sync I/O and how to recalibrate.

The onboard clock crystal of Sync I/O is factory calibrated to a number between -9999 to +9999. To check a SYNC I/O’s factory calibration, see the sticker on the bottom of the unit.
With normal usage, SYNC I/O should never require recalibrating. Each unit is factory calibrated to within +/- 5 ppm (parts per million).
You may want to recalibrate SYNC I/O in the following situations:
– If greater than 5 ppm accuracy is required
– If the unit needs to be matched to a unique (nonstandard) frequency
– To precisely compensate for component aging
– To restore the original factory setting
Note: Oscillator recalibration does not occur during firmware updating or when resetting SYNC I/O to factory defaults.
To recalibrate: Warm Up SYNC I/O Before Recalibrating. Before you begin the calibration procedure, power on SYNC I/O and allow it to warm up for at least five minutes. The temperature of the room (or chassis) isn’t critical during the calibration procedure. However, if you need better than 3 ppm accuracy, it is recommended that you allow SYNC I/O to warm up for at least 30 minutes and that the chassis be at normal operating temperature.
The original Oscillator Calibration value is printed on the factory sticker, on the SYNC I/O bottom panel. To restore the SYNC I/O oscillator calibration to its factory setting:

1 Press Set, then press Up until Video System (VIdEo SY) is displayed in the LED readout.
2 With the LED Time Code Display showing VIdEo SY, press and hold the Up switch. While you continue to hold that switch, press the Clock Reference switch momentarily, and then release both switches. The LED Time Code Display will read: O5C CAL,
3 Press Set again. The LED Time Code Display shows the current parameter value, which shows a sample rate frequency deviation from ?0999 to 0999.
4 Take note of the Oscillator Calibration value printed on the factory sticker, on the SYNC I/O bottom panel.
5 Use the Down and Up switches to scroll through the parameter values.
6 When you reach a value that matches the sticker?s value, stop scrolling and press Set. The LED Time Code Display will return to showing time code numbers. Your SYNC I/O is now properly calibrated. The next time you press Set, the LED Time Code Display will again show O5C CAL. If you then press the Down switch, you?ll disengage the Oscillator Calibration parameter name. To change the setting once again, you?ll need to repeat steps 1 through 6

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