BK Precision 4003 Bedienerhandbuch PDF herunterladen (Seite 3)

Section 1

Safety Guidelines

WARNING

Normal use of test equipment exposes you to a certain amount of danger from electrical shock because

testing must sometimes 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. A voltage as low as 35

volts DC or AC (RMS) 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

more easily produce a lethal current. Your normal work habits should include all accepted practices to

prevent contact with exposed high voltage and to steer current away from your heart in case of

accidental contact with high voltage. You will significantly reduce the risk factor if you know and

observe the following safety precautions.

1. Don’t expose high voltage 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.

2. 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.

3. Use an insulated floor material or a large, insulated floor to stand on and an insulated work surface

on which to place equipment and make certain such surfaces are not damp or wet.

4. 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.

5. 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. any time the equipment

is connected to an AC outlet, even if the equipment is turned off.

6. Some equipment with a two-wire AC power cord, including some with polarized power plugs, is the

“hot chassis” type. A plastic wooden cabinet insulates the chassis to protect the customer. When the

cabinet is removed for servicing, a serious shock hazard exists if the chassis is touched. Not only

does this present a dangerous shock hazard, but damage to test equipment. Always connect an

isolation transformer between the AC outlet and the equipment under test. The B&K Precision

Model TR-110 or 1604 Isolation Transformer or Model 1653 or 1655 AC Power Supply is suitable

for most applications. To be on the safe side, treat all two-wire AC equipment as “hot chassis”

unless you are sure it is isolated chassis or an earth ground chassis.

7. On test instruments or any equipment with a 3-wire AC power plug, use only a 3-wire outlet. This is

a safety feature to keep the housing or other exposed elements at earth ground.

8. B&K Precision products are not authorized for use in any application involving direct contact

between our product and the human body or for use as a critical component in a life support device

or system. Here “direct contact” refers to any connection from or to our equipment via any cabling

or switching means. A “critical component” is any component of a life support device or system

whose failure to perform can be reasonably expected to cause failure of that device or system or to

affect its safety or effectiveness.

Never work all alone. Someone should be nearby to render aid if necessary. Training in CPR (cardio-

pulmonary resuscitation) first aid is highly recommended.

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