Humboldt H-4140 GeoGauge - Manual (Page 16)

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3) GeoGauge will display, in sequence:
• Signal to Noise ratio (SNR) in dB [The stiffer the material, the
closer this value will be to 10, indicating that more than usual
attention should be paid to seating.]
• The standard deviation (5d) of all 25 frequency dependent
stiffness measurements relative to the displayed (average)
value of stiffness [This number will be small for soft materials
( ~ 1 MN/m) and larger for hard materials (~ 5 MN/m). A large
change in this number between test locations for a given
material may indicate improper seating (e.g., from 1.5 to
3 MN/m). A measurement should be repeated at such a
location to assure proper seating. If the measurement does not
change, then it is a true representation of the material.]
• Stiffness or Young’s modulus or fraction of stiffness Target
• Ready for next measurement (last measurement value
still displayed)
• Remove The GeoGauge From The Test Location
1) Examine the spot and ensure good foot contact
(see GeoGauge Seating).
2) Clean any soil off of the foot that may have been caked on in the
course of testing.
• Store Data (press “SAVE” button)
The measurement ID will be assigned to the stored data. The
GeoGauge will store data for 500 measurements as displayed
(Operational Mode). Only the first 20 measurements stored will also
include the complex, frequency dependent components of
displayed data (Research Mode).
• Turn The GeoGauge Off (press “OFF” button)
When done for the day, turn off to save battery power.
• Transfer Data (via optional Infrared interface)
Download data to a PC per GeoGauge Data Download Guide
(see Appendix 5).