GPS time from 6682 off by 17 seconds

[PDAS1]

I have a GPS antenna connected directly to a PXI-6682.  With the time reference set as GPS and the self survey successfully completed, the time read from the 6682 is about 31 seconds ahead of UTC, or about 17 seconds ahead of what it should be.  Also, if I connect the GPS signal to a Trimble Thunderbolt, I read the correct GPS time.

Any ideas on why this is happening?

[mr_]

PDAS1--

The 6682 uses TAI, which is not adjusted for leap seconds and is ahead of GPS time by 19 seconds.  I have a National Instruments KnowledgeBases linked that should explain this better.  It also provides a workaround for this offset.

Why Is My PXI-6682 Timestamp Off When Using GPS Protocol?

Cheers!