Greenlee 5990 Manuale utente

5990

Megohmmeter

Megóhmetro

Megohmmetre

INSTRUCTION MANUAL

MANUAL DE INSTRUCCIONES

MANUEL D’INSTRUCTIONS

Read and understand all of the instructions and safety information in

this manual before operating or servicing this tool.

Lea y entienda todas las instrucciones y la información sobre seguridad

que aparecen en este manual, antes de manejar estas herramientas o

darles mantenimiento.

Lire attentivement et bien comprendre toutes les instructions et les

informations sur la sécurité de ce manuel avant d‘utiliser ou de procéder à

l‘entretien de cet outil.

LOW BAT

Start

hold

M - 5000V

M - 2500V

M - 1000V

M - 500V

+–

Description

The Greenlee 5990 Megommeter is intended to test insulation and detect voltage. The unit features

an easy-to-read and accurate analog scale.

Safety

Safety is essential in the use and maintenance of Greenlee tools and equipment. This instruction manual

and any markings on the tool provide information for avoiding hazards and unsafe practices related to

the use of this tool. Observe all of the safety information provided.

Purpose

This instruction manual is intended to familiarize all personnel with the safe operation and maintenance

procedures for Greenlee 5990 Megommeter.

Keep this manual available to all personnel.

Replacement manuals are available upon request at no charge.

KEEP THIS MANUAL

All specifications are nominal and may change as design improvements occur. Greenlee Textron Inc. shall not be liable for

damages resulting from misapplication or misuse of its products.

®Registered: The color green for electrical test instruments is a registered trademark of Greenlee Textron Inc.

Do not discard this product or throw away!

For recycling information, go to www.greenlee.com.

5990

Important Safety Information

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.

This symbol is used to call your attention to hazards or unsafe practices which could result in an

injury or property damage. The signal word, defined below, indicates the severity of the hazard.

The message after the signal word provides information for preventing or avoiding the hazard.

SAFETY ALERT SYMBOL

Immediate hazards which, if not avoided, WILL result in severe injury or death.

Hazards which, if not avoided, COULD result in severe injury or death.

Hazards or unsafe practices which, if not avoided, MAY result in injury or property damage.

Important Safety Information

Electric shock and fire hazard:

•Do not expose this unit to rain or moisture.

•Do not use the unit if it is wet or damaged.

•Use test leads or accessories that are appropriate for the application. See the category and

voltage rating of the test lead or accessory.

•Inspect the test leads before use. They must be clean and dry, and the insulation must be in

good condition.

•Use this unit for the manufacturer’s intended purpose only, as described in this manual. Any

other use can impair the protection provided by the unit.

Failure to observe these warnings could result in severe injury or death.

Electric shock hazard:

•Do not apply more than the rated voltage between any two input terminals, or between any

input terminal and earth ground.

•Do not contact the test lead tips or any uninsulated portion of the accessory.

•Do not contact the test lead tips while performing the insulation resistance test.

Failure to observe these warnings could result in severe injury or death.

Electric shock hazard:

•Do not operate with the case open.

•Before opening the case, remove the test leads from the circuit and shut off the unit.

Failure to observe these warnings could result in severe injury or death.

Electric shock hazard:

Contact with live circuits could result in severe injury or death.

5990

Important Safety Information

Electric shock hazard:

•Unless measuring voltage, shut off and lock out power. Make sure that all capacitors are

discharged. Voltage must not be present.

•Using this unit near equipment that generates electromagnetic interference can result in

unstable or inaccurate readings.

Failure to observe these warnings could result in severe injury or death.

Electric shock hazard:

•Do not attempt to repair this unit. It contains no user-serviceable parts.

•Do not expose the unit to extremes in temperature or high humidity. See Specifications.

Failure to observe these precautions may result in injury and can damage the unit.

Identification

1. Positive (+) terminal

2. Shield terminal

3. Negative (–) terminal

4. Analog display

5. Test voltage selector switch

6. Low battery indicator

7. Start and Hold button

8. Battery cover

9. Zero adjustment screw

Display

10. Insulation resistance scale

11. DC or AC voltage scale

LOW BAT

Start

hold

M - 5000V

M - 2500V

M - 1000V

M - 500V

123

+–

MΩ

Symbols on the Unit

Read the instruction manual

Shock hazard

Double insulation

Recycle product in accordance with manufacturer’s directions

5990

Electric shock hazard:

Contact with live circuits could result in severe injury or death.

Operation

General Operation

1. Set the selector to the proper setting and connect the test leads to the meter.

2. Test the unit on a known functioning circuit or component.

•If the unit does not function as expected on a known functioning circuit, replace the batteries.

•If the unit still does not function as expected, send the unit to Greenlee for repair. See the

address shown under Warranty.

3. Take the reading from the circuit or component to be tested.

Typical Test Voltages

Resistance under test (MΩ)

Terminal voltage DC (kV)

0,1 1 10 100

MΩ1000V

MΩ2500V

MΩ5000V

MΩ500V

∝

Measuring Insulation Resistance

1. Before connecting the unit to the test piece, make sure the unit is off.

2. Follow the steps under “General Operation.”Note meter reading. If voltage is present, do not

attempt Insulation Resistance Test.

3. Press the START button to perform the test. To lock (hold) the START button for longer tests, press

the button and turn it clockwise.

Note: Check the reading every 5 minutes to ensure that the insulation has not broken down.

4. To discontinue the test, release the START button. If the button is in the locked position, press and

turn it counterclockwise.

Operation (cont’d)

LOW BAT

Start

hold

M - 5000V

M - 2500V

M - 1000V

M - 500V

+–

LOW BAT

Start

hold

M - 5000V

M - 2500V

M - 1000V

M - 500V

+–

5990

Measuring AC or DC Voltage

1. For voltage measurements, batteries are not needed. The maximum continuous voltage at the test

terminals is 600 V (AC or DC).

2. Before connecting the unit to the test piece, make sure the unit is off.

3. Follow the steps under “General Operation.”Do not press the START button to take voltage

measurements.

Using the Shield Terminal

Most insulation resistance measurements are performed without using the S (SHIELD) terminal.

However if measuring insulation of coaxial or similar cables, the test result can be a result of both

insulators’conductivity and of the insulators’surface conductivity (which appears either because of

humidity or dirt). To eliminate the influence of the surface conductivity, the S (SHIELD) terminal should

be used as shown in the illustration.

Shield

Inner Conductor

Insulator

+Rx -Rx

Operation (cont’d)

Accuracy

Accuracy is specified from 10 °C to 30 °C (50 °F to 86 °F)

Insulation Resistance

Measuring range: 500 kΩto 500 GΩ

Scale: Logarithmic

Accuracy: ±2 mm (0.08")

Voltage

Measuring range: 0 V to 600 V (AC or DC)

Scale: Linear

Accuracy: ±2 of full scale

Specifications

Display: Analog, length is 90 mm (3.54")

Operating Conditions: 0 °C to 40 °C (32 °F to 104 °F), less than 85% RH (non-condensing)

Indoor use only

Storage Conditions: -10 °C to 60 °C (14 °F to 140 °F), less than 80% RH (non-condensing)

Remove batteries

Altitude: 2000 m (6500') maximum

Pollution Degree: 2

Measurement Category: + Terminal: Category III, 600 VAC and 600 VDC

Battery: Four D 1.5-volt batteries (NEDA 13A or IEC LR20)

Low battery indicator: Red LED

Insulation Resistance

Measuring voltage: 500, 1000, 2500, 5000 VDC

Short circuit measuring current: Approximately 1.3 mA

Voltage

Input resistance DC voltage: 3 MΩ

Input resistance AC voltage: 1.35 MΩ

Indice

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