Product Safety; Extra Caution For Live Sound - D&R AIRMATE Manual

PRODUCT SAFETY

This product is manufactured with the highest standards and is double checked
in our quality control department for reliability in the
"HIGH VOLTAGE" section.
CAUTION
Never remove any panels, or open this equipment. No user serviceable parts
inside.
Equipment power supply must be grounded at all times.
Only use this product as described, in user manual or brochure.
Do not operate this equipment in high humidity or expose it to water or other
liquids.
Check the AC power supply cable to assure secure contact.
Have your equipment checked yearly by a qualified dealer service center.
Hazardous electrical shock can be avoided by carefully following the above
rules.

EXTRA CAUTION FOR LIVE SOUND

Ground all equipment using the ground pin in the AC power supply cable. Never remove this
pin. Ground loops should be eliminated only by use of isolation transformers for all inputs and
outputs. Replace any blown fuse with the same type and rating only after equipment has been
disconnected from AC power. If problem persists, return equipment to qualified service
technician
PLEASE READ THE FOLLOWING INFORMATION
Especially in sound equipment on stage the following information is essential to know.
An electrical shock is caused by voltage and current, actually it is the current that causes the
shock.
In practice the higher the voltage the higher the current will be and the higher the shock.
But there is another thing to consider and it is resistance. When the resistance in Ohms is high
between two poles, the current will be low and vice versa.
All three of these; voltage, current. and resistance are important in determining the effect of an
electrical shock.
However, the severity of a shock primarily determined by the amount of current flowing through a
person.
A person can feel a shock because the muscles in a body respond to electrical current and
because the heart is a muscle it can affect, when the current is high enough. Current can also be
fatal when it causes the chest muscles to contract and stop breathing. At what potential is
current dangerous.
Well the first feeling of current is a tingle at 0.001 Amp of current. The current between 0.1 Amp
and 0.2 Amp is fatal.
Imagine that your home fuses of 20 Amp can handle 200 times more current than is necessary to
kill. How does resistance affect the shock a person feels. A typical resistance between one hand to
the other in "dry" condition could well over 100,000 Ohm.
If you are playing on stage your body is perspiring extensively and your body resistance is lowered
by more than 50%. This is a situation in which current can easily flow.
Current will flow when there is a difference in ground potential between equipment on stage and
in the P.A. system. Please do check if there is any potential between the housing of the mikes and
Airmate manual page: 13