Quantum Composers 9730 Series - Manual (Page 6)

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Safety Issues
Normal use of equipment exposes users to a certain amount of danger from electrical
shock because testing must be performed where exposed voltage is present. An
electrical shock causing 10 milliamps of current to pass through the heart will stop most
human heartbeats. Voltages as low as 35 V (DC or RMS AC) should also be
considered dangerous and hazardous since they can produce a lethal current under
certain conditions. Higher voltages pose an even greater threat because such voltage
can more easily produce a lethal current. Your normal work habits should include all
accepted practices that will prevent contact with exposed high voltage, and those that
will steer current away from your heart in case of accidental contact with a high voltage.
You will significantly reduce the risk factor if you know and observe the following safety
precautions:

If possible, familiarize yourself with the equipment being tested and the location
of its high-voltage points. However, remember that high voltage may appear at
unexpected points in defective equipment.

Do not expose high voltage components needlessly. Remove housings and
covers only when necessary. Turn off equipment while making test connections
in high-voltage circuits. Discharge high-voltage capacitors after removing power.

Use an insulated floor material or a large, insulated floor mat to stand on, and an
insulated work surface on which to place equipment. Make certain such surfaces
are not damp or wet.

Use the time- proven “one hand in the pocket” technique while handling an
instrument probe. Be particularly careful to avoid contacting a nearby metal
object that could provide a good ground return path.

When testing AC powered equipment, remember that AC line voltage is usually
present on some power input circuits, such as the on-off switch, fuses, power
transformer etc., and any time the equipment is connected to an AC outlet, even
if the equipment is turned off.

Never work alone. Someone should always be nearby to render aid if necessary.
Training in CPR first aid is highly recommended.