14
4 OPERATION
Multi-function instruments (VOM’s) such as the 260-8 are intended
as general purpose measuring Instruments for use in low power cir-
cuitry such as found in consumer appliances, TV and radio receivers,
and in general laboratory applications. Their use is not recommended
in high voltage, high power circuitry where operator errors and inad-
equate personal protective measures could result in serious injury
from arcing or explosion. Such circuitry is found in industrial or com-
mercial applications such as induction (r-f) heaters and broadcast
transmitters, power substations and distribution centers, x-ray equip-
ment, large motor controls and the like. Working in the high voltage
section of such equipment requires single-function, often specially
designed instruments used by specially trained personnel using ap-
propriate protective equipment and procedures.
4.1 General
This section of the manual contains information required to use and operate the
260-8 in a safe and proper manner.
4.2 Safety Precautions
The following precautions are suggestions and reminders of commonly recog-
nized safe practices and specific hazards to be avoided and are not implied to be
sufficient to ensure the safety of untrained personnel in all circumstances. Nei-
ther is this manual a substitute for technical manuals covering the equipment in
which measurements are to be made. Always refer to the equipment manual and
its specific warnings and instructions and observe them as well as those con-
tained herein.
a. The 260-8 should only be used by personnel qualified to recognize shock
hazards and trained in the safety precautions required to avoid possible in-
jury.
b. Do not connect any terminal of this Instrument to a circuit point at which a
voltage exceeding 1000 volts AC or DC may exist with respect to earth ground.
(Refer to Table 1-1, item 16.)
c. Turn off power and discharge any capacitors in the circuit to be measured
before connecting to or disconnecting from it.
d. Prior to using this Instrument, check accessories (if any) and test leads for
missing, damaged, deteriorated or otherwise faulty insulating parts. Do not
use, or permit the use of equipment with faulty insulation until it has been
properly repaired.
e. Always wear safety glasses when working in electrical circuitry.
f. Do not work alone on high voltage circuits. Make certain that someone ca-
pable of rendering aid is nearby and watchful.
g. Do not handle the Instrument, its test leads, or the circuitry while high voltage
is being applied.
h. Hands, shoes, floor, and workbench must be dry. Avoid making measure-
ments under humid, damp, or other environmental conditions that could ef-
fect the dielectric withstanding voltage of the test leads or Instrument.
i. Do not change switch settings or test lead connections while taking measure-
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