5
Operation
Warning
Disconnect transducer
from echo sounder before testing！
Auto self-test
On startup, the screen will show the system firmware version.
Main menu
After the auto self-test procedure, the SIM990 MAIN MENU appears.
The SIM990 also shows the battery status. The battery should last about 4
hours for transducer tester and shorter for simulator. In echo sounder
simulator mode, the signal will become noisy if the voltage gets lower. It is
therefore recommended to use the power supply in this mode. If the battery
level gets less than 50 %, a low-battery warning will show.
To prolong the battery life, please charge timely when battery gets low.
On the tester, press or to change the location of the flashing cursor,
and press to enter the function accordingly.
Self-test Rslt
Self-test Pass!
Rfreq:XXX.X kHz
Rres:XXXXX ohm
Battery status indication
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