Use the following techniques to troubleshoot errors you might encounter while setting and locking to an external timer reference.
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Ensure the time reference is available to the device using the Is Time Reference Present? property of niSync Properties.
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Ensure that you set your device to the right external time reference using the Time Reference property.
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Correct for the offset from the time reference using the Time Reference Correction property. You can return the offset using the Offset from Time Reference property.