BNC 525, Руководство по эксплуатации, Страница: 5 / 40

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 s top 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 t he 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.