Greenlee 5778 Guide
OPERATION, SERVICE AND
PARTS INSTRUCTION MANUAL
999 9605.7 IM 1065 REV 1 9/97
© 1997 Greenlee Textron
Read and understand this
material before operating or
servicing this equipment.
Failure to understand how to safely
operate this tool could result in an
accident causing serious injury or death.
MEGOHMMETER
MODEL 5778
Greenlee Textron / Subsidiary of Textron Inc.
5778 Megohmmeter
IMPORTANT SAFETY
INSTRUCTIONS
SAFETY ALERT
SYMBOL
The symbol above is used to call your
attention to instructions concerning
your personal safety. Watch for this
symbol. It points out important safety
precautions. It means “ATTENTION!
Become alert! Your personal safety
is involved!” Read the message that
follows and be alert to the possibility
of personal injury or death.
Immediate hazards which, if not
avoided, WILL result in severe personal
injury or death.
Hazards or unsafe practices which, if not
avoided, COULD result in severe personal
injury or death.
Hazards or unsafe practices which, if not
avoided, COULD result in minor personal
injury or property damage.
SAVE THESE INSTRUCTIONS
Additional copies of this manual are
available upon request at no charge.
2
4455 Boeing Dr., Rockford, IL 61109-2988 815/397-7070
5778 Megohmmeter
IMPORTANT SAFETY
INSTRUCTIONS
A person who has not read
and does not understand all
operating instructions is not
qualified to operate this tool.
Failure to read and understand
safety instructions may result
in injury or death.
SAVE THESE INSTRUCTIONS
Additional copies of this manual are
available upon request at no charge.
3
Electric shock hazard:
Contact with the test leads
while turning the hand crank
could result in severe injury
or death.
Electric shock hazard:
Contact with live circuits
could result in severe injury
or death.
Greenlee Textron / Subsidiary of Textron Inc.
5778 Megohmmeter
SAVE THESE INSTRUCTIONS
Additional copies of this manual are
available upon request at no charge.
IMPORTANT SAFETY
INSTRUCTIONS
4
• Do not connect the tester to a source
of voltage or current. Damage to the
tester may result.
• Do not perform any service or
maintenance other than as described
in the manual. Unauthorized repairs
will void the warranty and may
damage the tester.
• Do not use or store the tester in hot
(more than 135°F or 57°C) or
humid (more than 80% relative
humidity) conditions. Damage to the
tester may result.
Failure to observe these precautions
could result in injury and damage to
the tester.
Do not use the tester if it is wet or
damaged. Electric shock may result.
Failure to observe this warning could
result in severe injury or death.
4455 Boeing Dr., Rockford, IL 61109-2988 815/397-7070
5778 Megohmmeter
Description
The 5778 Megohmmeter is intended to
perform nondestructive insulation tests for
electrical wire, machines, transformers,
motors, and other equipment.
Features
• Large, easy-to-read display
• 3 Test Ranges
• Hand Crank
• Protective Leather Carrying Case
• Color-coded test leads
• Insulated alligator clips
5
Display
Alligator Clips
Hand CrankTest Leads
Test Ranges
Greenlee Textron / Subsidiary of Textron Inc.
5778 Megohmmeter
Megohmmeter Test
1. Visually inspect the tester, test leads,
and alligator clips.
2. Plug the red test lead into the positive
jack, and plug the black test lead into
the negative jack.
Note: Be sure that the clips do not
contact anything.
3. Press the 1000 volt selector switch.
4. Turn the crank clockwise approximately
2-1/2 to 3 turns per second. The
pointer should move to the right-hand
side of the scale (toward the infinity
mark). Any other reading indicates that
the test leads are damaged or the
megohmmeter needs repair.
5. Connect the alligator clips together.
Turn the crank clockwise approxi-
mately 2-1/2 to 3 turns per second.
The pointer should move to the left-
hand side of the scale (toward zero).
Any other reading indicates that the
test leads are damaged.
Setup
Note: Refer the manufacturer’s
specifications to find the
operating voltage of the device
under test.
1. Shut off and disconnect power. Make
sure all capacitors are fully discharged.
Voltage must not be present.
2. Select the test range on the
megohmmeter to twice the operating
voltage for the device under test.
6
4455 Boeing Dr., Rockford, IL 61109-2988 815/397-7070
5778 Megohmmeter
Resistance to Ground Test
1. Connect the red test lead to a ground
such as the frame of the device to be
checked.
2. Connect the black test lead to the
circuit.
3. Turn the hand crank approximately
2-1/2 to 3 turns per second and read
the display.
Resistance Between Wires Test
1. Connect the test leads to the
conductors.
2. Turn the hand crank approximately
2-1/2 to 3 turns per second and read
the display.
To Determine the Insulation
Resistance:
• 250-volt range: Tester Reading x .5 =
Resistance in Megohms
• 500-volt range: Tester Reading =
Resistance in Megohms
• 1000-volt range: Tester Reading x 2 =
Resistance in Megohms
7
Lifetime Limited Warranty
Greenlee warrants to the original purchaser
of these goods for use that these products
will be free from defects in workmanship
and material for their useful life, excepting
normal wear and abuse. This warranty is
subject to the same terms and conditions
contained in Greenlee’s standard one year
limited warranty.
For all Test Instrument repairs, ship units
Freight Prepaid to:
Greenlee Textron at 4411 Boeing Drive,
Rockford, IL 61109-2932 USA.
Mark all packages: Attention TEST
INSTRUMENT REPAIR. For items not
covered under warranty (such as dropped,
abused, etc.), repair cost quote available
upon request.
Note: Prior to returning any test instrument,
please check replaceable batteries or
make sure the battery is at full
charge.
Greenlee Textron
Subsidiary of Textron Inc.
4455 Boeing Drive
Rockford, IL 61109-2988 USA
General Offices: 815/397-7070
Customer Center and Field Service:
800/435-0786
Fax (24 Hour) Customer Center:
800/451-2632 • 815/397-1865
Canada Fax (24 Hour) Customer Center:
800/524-2853
Printed in the U.S.A.
MANUAL DE INSTRUCCIONES
SOBRE OPERACIÓN, SERVICIO
Y PARTES
999 9605.7 IM 1065 REV 1 9/97
© 1997 Greenlee Textron
Lea y entienda este
documento antes de manejar
o dar servicio a este equipo.
Utilizarlo sin comprender cómo manejarlo
de manera segura podría ocasionar un
accidente y como resultado de éste,
graves lesiones o incluso la muerte.
MEGÓHMETRO
MODELO 5778
Greenlee Textron / Filial de Textron, Inc.
Megóhmetro 5778
IMPORTANTES
INSTRUCCIONES SOBRE
SEGURIDAD
10
GUARDE ESTAS INSTRUCCIONES
Copias adicionales de este manual pueden
obtenerse gratuitamente, previa solicitud.
Este símbolo se utiliza para llamar su
atención hacia las instrucciones sobre
seguridad personal. Ponga atención
cuando lo vea ya que le indica
importantes precauciones que debe
tomar para su propia seguridad.
Significa: “¡ATENCIÓN! ¡Póngase alerta
o podría atentar contra su seguridad!”
Lea el mensaje que aparece enseguida
y esté consciente de que puede sufrir
lesiones o incluso la muerte.
SÍMBOLO DE
ALERTA SOBRE
SEGURIDAD
Peligro inmediato que, de no evitarse,
OCASIONARÁ graves lesiones
personales o la muerte.
Peligro o prácticas peligrosas que, de
no evitarse, PODRÍAN OCASIONAR
graves lesiones personales o la muerte.
Peligro o prácticas peligrosas que, de no
evitarse, PODRÍAN OCASIONAR lesiones
de menor gravedad o daño a la propiedad.
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