Vanguard DMOM-100 - Manual (Page 3)

Operating Procedures DMOM-100™
i
The following safety precautions must be
observed during all phases of test set-up, test
hookups, testing, and test-lead disconnects.
Do Not Service or Test Alone
Do not perform test procedures or service
unless another person is also present who is
capable of rendering aid and resuscitation.
Avoid Contact with High Voltage
Because electrical utility station
environments contain high voltages and
currents, there is always the possibility of
personal contact with an unexpected lethal
voltage generated by magnetic induction
and/or electrostatic leakage from nearby live
circuitry. When test units are connected to
deenergized (“dead”) power lines, regardless
of how short they are, always discharge the
lines before attaching any test lead. Because
of the possibly deadly consequences of
physical contact with such high-voltage lines,
engineers and technicians must always treat
electrical equipment and hookups as though a
lethal condition will eventually occur.
Therefore, no matter how unlikely it may
seem, never assume anything about the safety
of any test setup.
Ensure the safety of personnel by checking
first-hand to eliminate all possible hazards!
Do Not Test Inductive Winding Resistance
Because the DMOM-100
 produces test
currents up to 100 amperes, it is able to build
up large magnetic fields in iron-core
transformers. The interruption of such test
currents can produce a high voltage spike
that can cause severe injury, death, and/or
equipment damage. Therefore, do not
attempt to measure the resistance of iron-core
transformer windings (use equipment
designed specifically for that purpose).
Do Not Modify Test Equipment
Because of the added risk of introducing
additional or unknown
hazards, do not install
substitute parts or perform any unauthorized
modification to the DMOM-100
. To
ensure that designed safety features are
maintained, it is recommended that all
DMOM-100
 repairs be done at Vanguard
Instruments Company or by an authorized
repair-service. Unauthorized DMOM-100

modifications can create unknown safety
hazards and will void the warranty.
Follow Exact Operating Procedures
Any deviation from the operating procedures
described in this manual may create one or
more safety hazards, damage the DMOM-
100
 or cause test errors; Vanguard
Instruments Co. assumes no liability for
unsafe or improper use of the DMOM-100
.