The Kodiak GEFS Baseline Test was conducted from approximately 9:40 – 10:58 a.m. Every major electronic device from the campus, including the new High School, Middle School and Auditorium (location of the GEFS station) was powered off, then on, for a total of 24 stations. Kodiak GEFS Intelecell data for comparison was downloaded with time range from 9:30-11:00 a.m. The InteleCell download showed only 1 sample per minute. These tests were conducted by Kodiak World Bridge students John Dunlop, Levi Purdy and Anna McDonald, with Facilities director Gregg Hacker. The students conducted the test as Mr. Hacker powered off/on the equipment, then downloaded the InteleCell data for comparison. The baseline test data and obervations:
Data
InteleCell Data Download for comparison (csv)
Baseline Test Time and Location Description (xlsx)
Event Chart: Magnetometer X,Y,Z axis, with Events showing as vertical lines. Y Graph axis = nT
Kodiak GEFS Magnetometer X axis
Kodiak GEFS Magnetometer Y axis
Kodiak GEFS Magnetometer Z axis
Observations: There is no apparent correlation between GEFS recording, and power on/off of Kodiak EM components; however, there is an obvious repeating signal. The only component not powered off/on was the network server farm, which may be the cause of this repeating signal. Another possibility might be the InteleCell itself, since the magnetometer is installed directly above the InteleCell on the staff.
Handheld magnetometer readings from near the InteleCell: A smartphone running 3-axis magnetometer readings at 50hz was placed within 20 ft. of the InteleCell/magnetometer. The device was aligned true north, and adjusted for magnetic declination (see below). The following data chart also appears to indicate no significant correlation with power off/on data. The change in recording frequency at approximately 10:25 a.m. was due to unanticipated on/off sleep mode from the device (the device was not monitored during the test).
Handheld Magnetometer Near InteleCell
Photos courtesy Anna McDonald
Handheld magnetometer placement (20 ft) from InteleCell Kodiak GEFS Intallation on High School Auditorium roof
Taking measurements
Air compressor Air handling units
CD80 Stage Lighting dimmer control Heating units
High voltage units
Outside air unit Pace HVAC