9200 Manual Version 1.2 | Quantum Composers
Page 5
2.
Safety Issues
Normal use of test equipment presents a certain amount of danger due to electrical shock
because it may be necessary
for testing
to be performed where voltage is exposed.
An electrical shock causing 10 milliamps of current to pass through the heart will stop most
human heartbeats. Voltage as low as 35 VDC or 35 V
RMS
AC should be considered
dangerous and hazardous, as it can produce a lethal current under certain conditions.
Higher voltages pose an even greater threat because such voltage can easily produce a
lethal current. Your normal work habits should include all accepted practices that will
prevent contact with exposed high voltage and 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 needlessly. Remove housing and covers only when
necessary. Turn off equipment while making test connections in high - voltage
circuits. Discharge high-voltage capacitors after shutting down power.
When testing AC powered equipment, remember that AC line voltage is usually
present on power input circuits, such as the on-off switch, fuses, power transformer,
etc.
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 contact with metal objects that could provide a
good ground return path.
Never work alone. Someone should always be nearby to render aid if
necessary. Training in CPR first aid is highly recommended.