SP395 SoundPro Audio Integrator Form7492 Operation Manual
90
Cable Tester
The SP395 Cable Tester verifies the wiring and integrity of audio cables. It provides connection
to test cables with XLR balanced or ¼ phono unbalanced connectors. Simply connect one end of
the cable being tested to the appropriate input connector on the left side of the SP395 ("L" input).
Connect the other cable end to the corresponding output connector on the right side of the
SP395. The SP395 input/output connectors are clearly marked “Cable Test.”
The SP395 performs both an analog transmission loss test and a polarity test of the cable. The
SP395 performs an analog transmission test of the balanced or unbalanced cable. This test
alternately passes a 1 kHz and a 20 kHz signal through the cable and displays the dB loss at each
frequency. Good cables should have less than 0.5 dB loss at both frequencies. Poor cables often
show a difference in loss between the two test frequencies.
Use the Cable Tester to verify the wiring and functioning of microphone cables, patch cables, or
guitar cables. If the cable is good and has the proper wired polarity, the test readout indicates
“Passed” and the internal speaker beeps momentarily. If the cable is open or the polarity
reversed, the test readout indicates “Failed” and the internal speaker buzzes momentarily. Note
that the speaker beep only checks the results of the cable polarity tests.
Cable Test Display and Control Fields
Cable Test display and a description of its test fields.
1. Test Function – Identifies Cable Test (Cable) as the active test function.
2. Cable Type - Selects the type of audio cable that you are testing. Select one of the
following types:
• Unbal > Unbal - unbalanced-to-unbalanced cables
• Bal > Bal - balanced-to-balanced
3. Cable Test Status – Starts the cable test. Indicates “Test Running” when the cable test is
being performed. Indicates “Run Test” when the test is ready to be performed or when
the cable test is complete.
4. Analog Test Results 1 kHz- This shows the results of the 1 kHz transmission test. The
numbers are the dB attenuation loss through the cable. Better cables show readings closer
to 0, indicating no signal attenuation. For most audio cables, the 1 kHz levels should be
less than 0.5 dB.
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