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Reference Manual
IP2048/RM, Rev AA
Section 5: Service and Troubleshooting
February 2015
To clear all the stored false echoes
1. After entering the “Eng” menu (see the note above), press the green button
repeatedly until “Lrn” is indicated.
2. Press the blue button
to enter the “Lrn” menu.
3. With the display indicating “LrnX”, press and hold the green button
for ten seconds
to clear the memory. The display then indicates “Lrn0”.
4. To exit to the menu system press the red button
.
5. The menu “Lrn” re-appears. See the previous procedure for how to store new false
echoes or press the green button
to get to the next menu.
5.4.10 Setting the ambient temperature
Screen display: t
Factory default value: Auto
The transmitter has an integral temperature sensor to measure the temperature of the air space
surrounding it so that the speed of sound can be correctly computed for sending pulses. The dis-
tance-to-target is then calculated using the formula:
Distance to target = Speed of Sound in air * (Time for echo to return / 2)
Auto indicates the transmitter is set to continuously measure the temperature using the integral
temperature sensor. It may, occasionally, be necessary to over-ride this automatic monitoring
and fix the temperature to be used in speed-of-sound calculations, for example if the air
temperature is not uniform and the temperature being recorded is not the true air temperature.
Note
This menu option is in the engineering menu “Eng”. See “Accessing the engineering
menu” on page 49 or see Figure C-3 on page 79 for a map of the menu structure.