JRC JLN-900, Installation And Instruction Manual

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10-19
T2 NOISE TEST
DISABLED
Menu T2 forces the built-in self-diagnosis noise test to be executed and the
result is displayed in the NWW-82 Display Mode window.
Use + to change menu to ENABLED and then
Enter to start the test and go to
next sub-level where the test result will be displayed.
T2.1 NOISE LEVEL
654 :: 732
Menu T2.1 shows the measured noise level in channel 1 to
the left and in channel 2 to the right.
Noise levels from an undisturbed log system shall show
values below 700 over time. Low values are better than high.
T3 TRU S BALANCE
DISABLED
Menu T3 forces the built-in self-diagnosis TRU signal balance test to be
executed and the result is displayed in the NWW-82 Display Mode window.
Use + to change menu to ENABLED and then
Enter to start the test and go to
next sub-level where the test result will be displayed.
T3.1 SIG BALANCE
Q MAX= 78% OK
Menu T3.1 shows the measured signal balance as a quote
between the channels. Signal balances in the interval 50% -
200% are accepted as OK100% is the theoretically perfect
value.
Note!! If the ship doesn’t move the signal balance test might
indicate fail even if there is no problem with the signal
balance. Under such circumstances use the test with caution.
T4 LOOP TEST
DISABLED
Menu T4 forces the built-in self-diagnosis loop test to be executed and the
result is displayed in the NWW-82 Display Mode window.
Use + to change menu to ENABLED and then
Enter to start the test and go to
next sub-level where the test result will be displayed.
T4.1 LOOP TEST
0 : 82 : 0
The loop test generates transmit signals that are looped back
to the receiver and then correlated. Menu T4.1 shows the
correlation function at three different delays (lags).
The test is passed if the first and last value < 2 and the