Quantum Composers 9500 Plus Series - Manual (Page 7)

3
Safety Issues
Normal use of test equipment presents 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. Voltage as low as 35 VDC or
RMS AC should be considered dangerous and hazardous since 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.