May
2015
WorkHorse H-ADCP Operation Manual
Page 160
EAR-Controlled Technology Subject to Restrictions Contained on the Cover Page.
PT2 = Ancillary System Data
PT3 = Receive Path
PT4 = Transmit Path
PT5 = Electronics Wrap Around
PT6 = Receive Bandwidth
PT7 = RSSI Bandwidth
NOTE: Add 100 for automatic test repeat
PT200 = All tests
PT2 - Ancillary System Data
This test displays the values for ambient and attitude temperature and the contamination sensor (TRDI
use only). The ambient temperature is measured on the receiver board. This sensor is imbedded in the
transducer head, and is used for water temperature reading. The attitude temperature is measured on the
PIO board under the compass. If one of the sensors fails, the PC2 test will show both sensors at the same
value. The H-ADCP will use the attitude temperature if the ambient temperature sensor fails. A reading
≥
+55° may indicate a shorted sensor, and a reading
≥
-32° may indicate an open sensor.
>PT2
Ambient Temperature = 21.10 Degrees C
Attitude Temperature = 21.39 Degrees C
Internal Moisture = 8D50h
PT3 - Receive Path
This test displays receive path characteristics. The test result is given as eight nibbles (1 nibble = 4 bits).
Each nibble represents the result for a particular beam (most significant nibble = beam 1, least significant
nibble = beam 8) (H-ADCPs utilize the four most significant nibbles). In this example, we only describe
which bit is set for beam 2 for a given failure type. This test has three parts.
•
Part 1
- The H-ADCP pings without transmitting and displays the result of an autocorrelation
function performed over 14 lag periods (only the first 8 are displayed). Ideally, we should see high
correlation at near-zero lags, and then see decorrelation as the lags get longer. High correlation
values at longer lags indicate interference is present.
•
Part 2
- The H-ADCP compares the RSSI value at high gain versus low gain. These values give the
noise floor for RSSI. A high noise floor indicates possible interference or a hardware problem. A
low difference between high and low RSSI values can indicate a problem in the demodulator, re-
ceiver, or RSSI switching circuitry.
•
Part 3
- The H-ADCP displays the demodulator DAC values.
>PT3
Correlation Magnitude: Wide Bandwidth
Lag Bm1 Bm2 Bm3 Bm4
0 255 255 255 255
1 169 175 167 179
2 49 55 54 58
3 26 20 19 8
4 20 17 24 29
5 14 13 14 23
6 8 4 13 8
7 6 1 10 1
High Gain RSSI: 43 41 40 42
Low Gain RSSI: 19 19 17 18
SIN Duty Cycle: 52 50 52 51
COS Duty Cycle: 49 50 51 51
Receive Test Results = $0000 .... PASS