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Test Procedures
2. Ground Bond Test
IMPORTANT: This test MUST be performed
if the ground connection from the AC inlet to
the chassis has been disturbed as part of a
repair. This test ensures that the ground
connection can take the full current of the AC
line if needed due to a product failure.
It does this by measuring the current han-
dling capability of the ground connection by
putting a high current through the ground
blade of the AC line cord and measuring the
leakage current on the exposed metal part
of the chassis.
2.1 Plug the AC line cord into the AC
adapter box supplied with the Hi-Pot tester.
Connect the return line from the Hi-Pot tester
to an exposed metal section of the chassis.
Ensure a good electrical connection.
2.2 Perform the ground bond test in
accordance with the parameters below.
- 10Amps, < 12VAC open circuit,
< 0.1 Ohms.
2.3 If the unit passes this test and the Hi-
Pot tests, it can be returned to the customer.
If the unit fails this test, it must be returned
to the repair tech for troubleshooting and
repair and then be retested.
L1 Model 1S Line Array Tests
Set up the unit under test as shown below.
1. Air Leak Test
1.1 Apply a 100 Hz, 10 Vrms sine wave to
the unit under test.
1.2 Listen carefully for air leaks from around
the end cap, the transducers and the grille.
Air leaks will be heard as a hissing or sput-
tering sound. All repairs must be hidden.
Test duration should be 5 seconds minimum.
2. Transducer Rub and Tick Test
2.1 Remove the transducer you wish to test
using the disassembly procedures in this
manual.
2.2 Connect a signal generator directly to
the terminals of the transducer assembly
under test.
2.3 Apply a 20 Hz, 5 Vrms sine wave to the
transducer assembly.
Power Amplifier
INPUT
OUTPUT
Audio Signal
Generator
L1.5 Line Array
Upper Section
Line Array Test Cable
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