Auxiliary Telemetry; Receive Sensitivity; Battery Voltage And Charge Status; Turnaround Time - Edgetech 4380 MULTIBEACON User Hardware Manual

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3-3

To load a telemetry waveform the user must connect to the serial port, type the command LWTEL, go to

the FILE drop down menu and select SEND FILE, and select the waveform to be loaded.

3.1.2.9

Auxiliary Telemetry

Auxiliary telemetry is very similar to pressure telemetry. The difference being that instead of measuring

pressure, the delay is based on an analog signal supplied by an external sensor. The auxiliary analog signal

range is 0 – 5 Vdc, with the two reply pulses scaled for a 100mS delay at 0 volts input, and a 1.000 second

delay at 5.00 Vdc input.

The receive sensitivity of the 4380 can be switched between 100 and 200 microvolts. The reduced

sensitivity setting (200 microvolts) is useful when tracking at short ranges and in high multipath

environments.

The 4380 is internally powered by a pair of Lithium ION battery backs. An on-board charge management

circuit monitors the batteries and controls the charge profile. Querying the beacon will report back the

battery pack voltage and charge status. The beacon will report a charging fault if the temperature inside

the tube is outside of the allowable range (0 – 45 degrees C).

The Lithium ION batteries in the beacon have an internal protection circuit built in. This circuit prevents

the batteries from being over charged and from being deep discharged. When the protection circuit

senses the cell voltage is below the lower cutoff threshold, it will disconnect the cells automatically.

Turnaround time is the time delay between the beacon detecting the interrogate pulse and the beacon

sending the reply pulse when the beacon is acting as a transponder. It should be noted that short

turnaround times make it impossible to track a beacon at close ranges. Longer turnaround time (~100mS)

allows the topside to track down to a range of essentially zero meters.

The responder lockout time sets the maximum rate that the responder can be keyed. When operating as

a responder in high electrical noise environments, longer responder lockout times are desirable because

they reduce the number of false triggers seen by the responder. If the Responder Lockout is set to less

than 1 second, it can interfere with the telemetry readings.

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