Copyright © Sigicom AB 2019
The use of US standard
ISEE Seismograph (S51 and S52)
Standards 51 and 52 can be used with or without trigger filter. If no
trigger filter is used, a transient will be recorded if a peak becomes larger
than the configured Trigger level, independent of the frequency. However,
when a trigger filter is selected, the actual trigger level depends on the
frequency of the peak, see Figure J1. There are two versions of trigger
filter; Drywall and Plaster, the only difference between them is their
nominal levels:
• Drywall: 0.75 in/s (4 – 15 Hz)
• Plaster: 0.50 in/s (2.65 – 10 Hz)
Figure J1. Trigger filter for S51 ISEE Seismograph.
The nominal level is defined in the frequency interval 4 – 15 Hz for Drywall,
and in the frequency interval 2.6 – 10 Hz for Plaster.
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General