Jeff K, Jonathan, Jim, Dave:

For due diligence we performed some sanity tests on the DAQ to confirm the leap-seconds did not cause any problems.

Event at Known Time:

Jeff K dropped a ball onto the control room floor at a recorded time. We looked at a seismometer signal (e.g. H1:ISI-GND_STS_HAM2_X_DQ) using both NDS1 (dataviewer and command-line) and NDS2. The signal showed up in the latter part of the recorded second as expected.

Decode IRIG-B analog signal:

The digitized IRIG-B signal H1:CAL-PCALX_IRIGB_OUT_DQ was read by hand for an arbitary GPS time. The time chosen is GPS = 1167523720 which corresponds to a UTC time of Jan 04 2017 00:08:22.

The decoded IRIGB time is 00:08:40 which is UTC + 18. Tthere have indeed been 18 leap seconds applied to UTC since the GPS epoch of Jan 1980, this is correct.

For anyone interested in decoding irig-b by hand, the attached image shows the seconds, minutes, hours part of the analog signal along with the decoding table.