120 Micromate Operator Manual – 721U0201 Revision 6
15. CALIBRATION
Instantel recommends calibrating all models of its vibration and overpressure monitors once a year
and provides the Next Calibration date on the unit and sensors. The calibration process is the only
method to ensure the instrument is performing as it was designed and accurately measuring the
ground vibration and air overpressure it receives. Using a manufacturer certified facility ensures
the proper procedures are followed when calibrating your vibration monitor. This removes any
uncertainty associated with the reliability and measurement accuracy of your monitor. It also helps
ensures the integrity of the measured recorded events if they are ever called upon as evidence in a
court of law. Using unauthorized facilities may have negative legal consequences if the reference
equipment is not traceable, the proper procedures are not followed or if the certification
documents are incomplete.
15.1.1. Geophone Calibration
The Micromate and geophone are calibrated as a system to either the ISEE or DIN standard. Both
the Micromate unit and geophone will have the same serial number indicating they are a matching
set. The geophones cannot be interchanged with other Micromate units. Interchanging
geophones will result in inaccurate data being recorded.
The Micromate geophone assembly will be secured to a shake table with a calibrated and traceable
reference sensor.
Geophone Secured to Shake Table
The shake table will then be shaken at the frequencies required to meet the specific standard, ISEE
or DIN, and these output signals are monitored. An ISEE geophone response is checked every 0.5
Hertz (Hz) from 1.0 Hz to 500 Hz and a DIN geophone response is checked every 1.0 Hz from 0.5 to
899 Hz.
The filter response of the Micromate will be adjusted to ensure each of the three sensors,
Transverse, Vertical and Longitudinal, will meet the specific standard at all of the different
frequencies. The actual response for each sensor will be saved, printed and provided as part of the
To Next Page
Loading...
