Teledyne ADFM Analog Output Module, Техническое руководство, Страница: 48 / 156

Chapter 5
d. If the transducer is immersed in a bucket of water that is resting on
the floor, noise can be coupled into the ADFM. As such, you should
shield the bucket from the floor by inserting a piece of hard foam be-
tween the bucket and the floor.
e. If possible, you may also want to move the ADFM to a different
room, or at least to a different part of the lab to see if the fail condi-
tion goes away.
f. If after following the above procedure, your ADFM still fails the re-
ceive tests, contact MGD for assistance.
5-4.2 Receive Path Test
This test runs a through test on the ADFM’s receive path electronic cir-
cuits.
a. Start BBTALK . Press the
End
key to wake the ADFM.
b. Type
CP
to clear the fault log.
c. Type
PT3
. A message similar to the following should appear.
>pt3
Correlation Magnitude:
Lag Bm1 Bm2 Bm3 Bm4 Bm5
0 255 255 255 255 255
1 206 212 207 206 212
2 103 118 107 105 119
3 31 47 33 33 49
4 4 15 9 6 16
5 2 3 7 3 7
6 2 2 9 1 5
7 2 2 6 1 4
High Gain RSSI: 45 47 44 42 47
DAC Sin: 182
DAC Cos: 183
Duty: 50 50, LPF: 0
Receive Test Results = $00000000 ... PASS
d. Observe the High Gain RSSI values. They should be between 40 to
57 counts with the transducer connected.
e. Disconnect the transducer from the electronic housing by disconnect-
ing the transducer cable.
f. Type
PT3
. A message similar to the following should appear.
page 5-4 MGD Technologies, Inc.