Hi Karl, I used a coil connected to a battery and switch, when the switch was pressed it triggered a "CRO". After the delay period the seismographs output was measured directly on the "CRO". The coil was placed some 4 feet from the seismograph, this gave the necessary mechanical force via the magnetic pulse. The battery was 1.5 volts. The dampening adjustment was also set by this method. Arie > SDR has a time delay parameter that can be entered for each channel, to > compensate for time delay in the seismometer. I'd like to make some > measurements to be able to enter accurate values for these, and I'm curious > how time delay of a seismometer is measured. I can easily see how it could > be done with a shaker table, but not having that luxury, what are some > other methods? _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L)
Larry Cochrane <cochrane@..............>