LA Audio PC90 - Manual (Page 4)

 www.laaudio.co.uk 
Important Safety Information.
COVERS
DO NOT remove the covers. Refer servicing to qualified personnel only.
MOISTURE
DO NOT expose the unit to rain or moisture. If your PC90 should become
so exposed, remove the unit from the source of moisture and allow to dry
thoroughly before attempting use again.
HEAT
ALWAYS site your PC90 away from sources of heat including direct sunlight
and ensure adequate ventilation around the unit.
REGULATORY COMPLIANCE
This product complies with both the EMC Directive (89//EEC) and the Low
Voltage Directive (//EEC) as issued by the Commission of the European
Community. Compliance with these directives imply conformity with the
following European standards:
 EN00 Product safety
 EN10-1 Electromagnetic Interference (Emission)
 EN10- Electromagnetic Susceptibility (Immunity)
Introduction.
The PC90 is an advanced measuring system which allows you to check the
polarity of any electronic audio signal path. It’s an ideal tool for numerous
applications and should take pride of place in your toolbox.
For a system to perform correctly, the polarity of the signals must be
maintained from input to output. Unintentional polarity reversal needs to be
avoided, and this is what the PC90 checks for.
The system is in two parts, an emitter and receiver, which can be placed at any
point in an audio system. The emitter produces a 1Hz pulse, which can be sent
acoustically or electronically to the receiver, which determines polarity.
This manual is your guide to exactly how the PC90 functions, and how you
should look after it to ensure its continued faithful service. Please have a good
read before use.