Robert, Vinny, Stefan C, Dave:

The recently installed IRIGB signals were clipping the ADC due to the 10X gain in the PEM AA chassis. We installed a 10X attenuator in the line at the IRIG-B chassis in both end stations, the IRIGB signal range is now 0 - 5000 counts.

We also power cycled h1pemmy to see if this would remove the 64Hz noise being seen in the SEIS channels there. The procedure was: stop all models, power down h1pemmy, power down IO Chassis, power up IO Chassis, power up h1pemmy. We got lucky on the auto-code start and the timing came back OK with no further IOP restarts required.

Unfortunately this power cycle does not seem to have fixed the noise.