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4
START WORK
4.1
Use of GPS
Upon start up, the GPS is not active. It must be activated prior to testing.
Note: Data is only acquired and saved when the GPS is active.
4.1.1
GPS Activation
Connect the external GPS antenna.
To activate the GPS, press the selector dial
and rotate the dial to scroll through the menu
options
until “ON/OFF GPS” appears. Press the
selector dial to confirm the selection. The GPS
icon will change status
from “Off” to “Active”.
The "Save Location" icon will appear in the
upper left-hand corner of the display.
The percentage of memory used will be
displayed in the bottom left-hand corner.
Initially, only the percent symbol, (%), will be
displayed. Once the GPS has stabilized and the
SEM5000 begins saving data, a number will
appear next to the percent symbol to indicate
what percentage of the memory has been
used.
Icon
Description
Icon
Description
GPS active but waiting for
signal
GPS off
GPS active
Save location
The GPS module is a high performance receiver with the ability to track up to
20 satellites. The antenna is a standard, high gain, vehicular type that provides
quality tracking performance.
Start-up time for the GPS module can vary according to the strength of the
actual signal received. The presence of high trees or buildings, aerial power
lines or other obstructions will affect the signal. Typically, in an open area, the
GPS will fix in less than a minute.
In the event of signal loss during the survey, the instrument will continue to
log gas values, and will associate the last saved tracked GPS position.