284
442703/B
Context
Thistaskallowsyoutocheckthenoiseconditions.Tomeasurethenoiselevel,observe
thevaluepresentedontheNoisepageintheBITEdialogbox.
Note
ThistaskmustbedonewiththetransducercabledisconnectedfromtheTransceiverUnit.
Procedure
1OpentheOperationmenu.
2SetTXPowertoOff.
3Makethefollowingpreparations.
aAtthebottomoftheST90presentation,selectasuitablepresentationmode,
andactivatetheHorizontalview.
bSetFrequencyto14kHz.
cSetRangeto1500m.
dSetGainto20.
TheGainsettinghasnoeffectonthenoisemeasurement.
eSelectBITEtoopentheBITE(Built-InTestEquipment)dialogbox.
fSelectNoisetoopenthepage.
4SelectStartNoiseMeasurements.
aObservethenoisecurve.
bReadthemaximumandaveragenoisevalues.
cRepeatforselectedfrequencies.
dRecordthefrequenciesandthemeasuredvaluesintheresulttable.
Result
Foreachtransmitfrequency(inkHz),writedownthemeasurednoiselevels(indB).
Frequency
MaximumAverage
14kHz
19kHz
24kHz
SimradST90InstallationManual
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