Low Frequency Vibration Measurements

Low frequency vibration typically falls between 1 Hz and 100 Hz, though construction and blasting monitoring standards often define the practical range as 2-250 Hz for ISEE compliance or 1-315 Hz under DIN 45669-1. This range covers ground-borne vibrations from blasting, pile driving, tunneling, and heavy equipment operation.

In construction monitoring, low frequency vibration generally refers to ground vibrations below 30-40 Hz, commonly generated by pile driving, blasting, and heavy machinery. These frequencies are closely monitored because they can pose greater risk to nearby structures and require compliance with standards like ISEE and DIN 45669-1.

The Micromate, Micromate Plus, and Minimate Pro are all well-suited for low frequency vibration measurements, offering geophone frequency ranges of 2-250 Hz (ISEE) or 1-315 Hz (DIN). The Minimate Pro additionally supports accelerometers and high-frequency geophones for advanced multi-sensor monitoring applications.

Common standards include ISEE (International Society of Explosive Engineers) 2011 guidelines, DIN 45669-1, and Swedish blasting (SS4604866) and pile driving (SS025211) standards. These define acceptable vibration thresholds, measurement methods, and equipment calibration requirements for construction, mining, and blasting operations.

Yes, units like the Micromate and Micromate Plus feature a dedicated channel for air overpressure or sound level microphones alongside three channels for triaxial geophones, allowing simultaneous recording of vibration, sound, and air overpressure data from a single monitoring unit.

Instantel seismographs like the Micromate and Minimate Pro offer 10 to 15 days of uninterrupted monitoring on internal battery power, extendable with solar panels or external batteries for remote installations. Annual calibration is recommended to maintain measurement accuracy and warranty coverage.