Greenlee 5990 User manual

99938014 © 2006 Greenlee Textron Inc. IM 1476 REV 1 1/06
5990
Megohmmeter
Megóhmetro
Megohmmetre
INSTRUCTION MANUAL
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
V
M
M - 5000V
M - 2500V
M - 1000V
M - 500V
!
5
0
0
G
2
0
0
5
0
2
0
5
2
5
0
0
2
0
0
5
0
2
0
5
2
5
0
0
K
1
0
0
G
1
0
G
1
G
1
0
0
M
1
0
M
1
M
m
O
V
1
0
0
V
2
0
0
V
3
0
0
V
4
0
0
V
5
0
0
V
6
0
0
V
0
V
+–
S

2
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
3
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.

4
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
5
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.

6
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
V
M
M - 5000V
M - 2500V
M - 1000V
M - 500V
!
65
8
4
9
123
7
5
0
0
G
2
0
0
5
0
2
0
5
2
5
0
0
2
0
0
5
0
2
0
5
2
5
0
0
K
1
0
0
G
1
0
G
1
G
1
0
0
M
1
0
M
1
M
m
O
V
1
0
0
V
2
0
0
V
3
0
0
V
4
0
0
V
5
0
0
V
6
0
0
V
0
V
+–
S
5
0
0
G
2
0
0
5
0
2
0
5
2
5
0
0
2
0
0
5
0
2
0
5
2
5
0
0
K
1
0
0
G
1
0
G
1
G
1
0
0
M
1
0
M
1
M
MΩ
O
V
1
0
0
V
2
0
0
V
3
0
0
V
4
0
0
V
5
0
0
V
6
0
0
V
0
V
10
11
Symbols on the Unit
Read the instruction manual
Shock hazard
Double insulation
Recycle product in accordance with manufacturer’s directions

5990
7
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)
6
5
4
3
2
1
0
0,1 1 10 100
MΩ1000V
MΩ2500V
MΩ5000V
MΩ500V
∝

8
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
V
M
M - 5000V
M - 2500V
M - 1000V
M - 500V
!
5
0
0
G
2
0
0
5
0
2
0
5
2
5
0
0
2
0
0
5
0
2
0
5
2
5
0
0
K
1
0
0
G
1
0
G
1
G
1
0
0
M
1
0
M
1
M
m
O
V
1
0
0
V
2
0
0
V
3
0
0
V
4
0
0
V
5
0
0
V
6
0
0
V
0
V
+–
S
LOW BAT
Start
hold
V
M
M - 5000V
M - 2500V
M - 1000V
M - 500V
!
5
0
0
G
2
0
0
5
0
2
0
5
2
5
0
0
2
0
0
5
0
2
0
5
2
5
0
0
K
1
0
0
G
1
0
G
1
G
1
0
0
M
1
0
M
1
M
m
O
V
1
0
0
V
2
0
0
V
3
0
0
V
4
0
0
V
5
0
0
V
6
0
0
V
0
V
+–
S

5990
9
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
Shield
Inner Conductor
Insulator
+Rx -Rx
Operation (cont’d)

10
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