Pathfinder DVL Guide
April
2018
EAR-Controlled Technology Subject to Restrictions Contained on the Cover Page.
Page 137
P P P P
Sin Duty Cycle (percent)
50 49 42 43 47 47 47 43 53 49 51 53 49 46 45 50
P P P P
Cos Duty Cycle (percent)
49 53 50 43 49 52 48 45 48 54 49 54 51 52 50 51
P P P P
RSSI Noise Floor (counts)
54 60 69 58 38 43 53 42 65 72 80 69 43 48 58 47
P P P P
RESULT...PASSED
PT3 is considered to have normal values if:
1.
Correlation at the last lag is less than 25%.
2.
The duty cycle of sine and cosine does not vary from 50% by more than +/-15%.
3.
RSSI noise level is less than 90 counts for the high gain, wide bandwidth setting.
PT5 – Transmit/Receive Continuity Check Test
Submerge the transducer face in a few inches of water when running the PT5 test.
The test
may fail in air and if so, is not relevant.
Only a failure with the transducer at a minimum in
contact with water is a relevant test.
This test checks the entire for signal path continuity (transmitter - transducer – receiver). The test deter-
mines if the transducer electronics are connected and, if so, whether the ceramics are connected. The test
must be run with the transducer in water. The first line of the test result measures the noise amplitude
level of the system in counts; this is used as a reference in the test.
The transducer electronics connection is tested by comparing the amplitude level in the middle of the
transmit pulse to the noise level. If it is above a threshold, the transducer electronics are connected to the
electronics enclosure.
The test to determine whether the ceramics are connected to the transducer electronics is attempted only
if the transducer electronics are connected. The ceramic connection is confirmed by comparing the ampli-
tude level immediately after transmit (the ringing level) to the noise level. If it is greater than the noise
level by a threshold, then the ceramic is connected.
Example:
>pt5
Transmit/Receive Continuity Check:
Test Beam
1 2 3 4
Noise(Amp/Rslt): 58/ PASSED 63/ PASSED 75/ PASSED 59/ PASSED
Elect(Amp/Rslt): 168/CONNECTED 172/CONNECTED 180/CONNECTED 169/CONNECTED
Ceramics(Amp/Rslt):10/CONNECTED 15/CONNECTED 12/CONNECTED 18/CONNECTED
RESULT...PASSED
PT5 has the following pass/fail criteria:
1.
Noise level is less than 90 counts is passing.
2.
The amplitude level at 1/2transmit is at least 120 counts for the transducer electronics to be con-
sidered connected.
3.
The amplitude level immediately after transmit must be no more than 30 counts below the trans-
mit level for the phased array system to pass. Otherwise, the ceramic(s) will be considered discon-
nected and the test will report a failure.