LA Audio Electronic PC80 MKII - Manual (Page 7)

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5. APPLICATION NOTES
• Feed the signal from the generator into a public address system and place the receiver in front of each
loudspeaker in turn to ensure that the system is in-phase.
• For a multi-mic application. Connect the receiver to a mixing console output and feed each microphone
with the generated pulse. The receiver may then be used to check that all the mics are in phase, (if out
of phase, cancellation effects may occur where mics are close together).
• The system may be used for checking phase transmission on tape recorders, (be prepared for some
surprises!). This test can be made by recording the generated signal onto tape and connecting the
receiver to the machines output. This is really useful in the recording studio, when using effects off tape
which are combined and for checking tape machine wiring.
• The system may also be used to check telephone lines, satellite links etc.
Notes:
It is important to note that the PC80 measures absolute phase.
Care should be taken when using the PC80 because some crossover networks and speaker systems
deliberately place certain speakers out of phase for correct operation.
Check the technical specifications of the system before commencing the test.
The system is not affected by any propogation delay or time delay effects.