Insulation

resistance
testing
A complete solution—
for every application.

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 Why perform
insulation
testing?
Safety Equipment uptime Insulation
The most important reason In addition, insulation testing is regulations
for testing insulation is to important to protect and prolong The International Electrical
ensure public and personal the life of electrical systems Testing Association (NETA)
safety. By performing a high and motors. Periodic mainte- provides representative and
dc voltage test between nance tests can provide valuable minimum insulation values
de-energized current-carrying information about the state of for various voltage ratings of
(hot), grounded, and grounding deterioration and will help in equipment for use when manu-
conductors, you can eliminate predicting possible failure of the facturer’s data is not available.
the possibility of having a system. Correcting problems will
life-threatening short circuit result not only in a trouble-free Insulation testers are essen-
or short to ground which could system, but will also extend the tial in any electrical system
lead to a fire. operating life for a variety of for proper and safe equip-
equipment. ment operation per industry
standards, IEEE Std 43-2000
Insulation resistance testers (Recommended Practice for
can be used to determine the Testing Insulation Resistance of
integrity of windings or cables Rotating Machines), and other
in motors, transformers, switch- recognized organizations.
gear, and electrical installations.
The test method is determined
by the type of equipment
being tested and the reason for
testing. Spot-reading/short time
resistance tests can be used for
low-capacitance equipment,
while trending tests such as step
voltage or dielectric-absorption
tests can be used for time-
dependent currents that will last
for hours.

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The International Electrical Testing Association (NETA) also
provides recommended test voltages when manufacturer’s
data is not available:

Minimum insulation Recommended

Nominal voltage resistance dc minimum insulation
rating of equipment test voltage resistance in megohms
250 500 25
600 1,000 100
1,000 1,000 100
5,000 2,500 1,000
15,000 2,500 5,000
Recommended test voltages and minimum insulation values. The
International Electrical Testing Association (NETA) provides recommended Insulation resistance basics
representative test and minimum insulation values for various voltage Insulation testing is a bit like pressure-checking
ratings of equipment for use when manufacturer’s data is not available.
a plumbing system. You can look for leaks in a
plumbing system by forcing water through at a
high pressure. The increased pressure makes
the leaks easier to spot. The electrical version of
pressure is voltage. In insulation testing we use a
relatively high dc voltage to make leakage current
more apparent. The instruments are designed to
apply the test voltage in a “non-destructive” and
very controlled way. Although they supply high
voltage, the current they deliver is strictly limited.
This helps prevent damage to systems with failing
insulation and keeps the operator from receiving
dangerous current levels from accidental contact.

All digital multimeters have a resistance measure-

ment capability (Ohms). But this function uses just
a few volts. For systems designed to work at more
than a few volts, using the standard ohms func-
tion does not give us an accurate picture of the
insulation integrity. We want to test the insulation
at a voltage greater than working voltage. This
will insure that any leakage will show up and if
there is a potential for arcing, we will see it under
the controlled test conditions.

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 Insulation spot test Polarity index
This can be used to verify the and dielectric
condition of the insulation over
the life of a motor by connecting
absorption ratio
Megohmeter to measure resis- These are timed ratio tests
tance of each winding to ground that check the absorp-
while recording reading onto tion characteristics of wet or
graph. contaminated insulation. The
PI test is performed over a 10
minute period whereas the
Insulation step DAR ratio test is performed over
voltage a 60 second span. There are
Creates electrical stress on minimum acceptable polariza-
internal insulation cracks to tion index values depending
reveal aging or damage not on the insulation class—IEEE
found during other motor insula- Standard 43-2000 covers
tion tests. This test is done by measurement of polarization
testing the insulation at two or index testing:
more voltages and comparing
the results. Insulation Index value
Class A 1.5
Class B 2.0

6
Class F 2.0
Class H 2.0

Tips for effective insulation testing

1 Disconnect any electronic devices like

motor drives, PLC’s, transmitters, etc. before
performing insulation testing. Electronics can be
4 When using an insulation tester, leave the
leads connected when you stop the test.
The insulation tester can discharge any residual
damaged by applying higher than normal voltage. test voltage.

2 The effect of temperature should be consid-

ered - it is recommended that tests be
performed at a standard conductor temperature
5 Conductors that are close to each other
have a normal capacitance. This will cause
an insulation resistance reading to start low and
of 20 °C (68 °F) or that a temperature baseline increase steadily until it stabilizes. This type
is established while compensating future read- of increase is normal, but if the reading jumps
ings by using a DMM with a probe or an infrared violently down and up again this indicates arcing.
thermometer.

3 Select a test voltage appropriate for the

insulation being tested. The objective is
6 Although the current is tightly limited, an
insulation tester can generate sparks and
minor but painful burns. The unexpected surprise
to stress the insulation but not to over-stress can cause an operator to jerk away. As always,
it. When in doubt, use a lower test voltage. It’s work away from live systems and use safe work
usually appropriate to test insulation at twice the practices when working overhead.
voltage it normally sees: for example 460 V to 600
V rated equipment is often tested at 1000 V.

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 Insulation
resistance
The latest test tools from the testing experts.

Time and again, electrical workers tell us about the impor-

tance of testing insulation resistance. Insulation resistance
tools are critical to a preventative maintenance program,
and a staple for troubleshooting any number of utility,
industrial and commercial applications.

Now Fluke has a tool for every budget and need,

from compact handhelds to a portable 10 kV model. We
even offer a full-featured insulation tester with multimeter
“You asked. We responded. functions built right in—it’s two products in one!

Every tester in the line is built to Fluke standards—in

Now you have more insulation other words, beyond your expectations. These tools are all
rugged, reliable, accurate and easy to use, for
testing choices than ever.” lower ownership costs over the long haul…less calibration
costs, less repair and replacement costs and longer product
lifetime.

Each Fluke tester also provides you access to “how-to”

application notes, selected case studies and expert techni-
cal support—FREE.

For more about testing insulation, along with complete

details on the growing family of Fluke insulation resistance
testers, just visit .

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A digital insulation tester and full-featured multimeter—
TWO TOOLS IN ONE!

Fluke 1587 FC/1577

Insulation Multimeters
The Fluke 1587 FC and 1577 combine the features of an in-
sulation tester with a full featured multimeter in one, compact
The Fluke 1587 FC adds
product. diagnostic functions
through the Fluke Connect
Both offer the “two tools in one” feature set, combining a Measurements app:
digital insulation tester with a full-featured, true-rms digital • PI/DAR timed ratio tests with
multimeter in a single, compact, handheld unit. The result: TrendIt™ graphs
maximum versatility for both troubleshooting and preventative
maintenance. • Memory storage through Fluke
Connect eliminates writing
Whether you work on motors, generators, cables or switch down results
gear, Fluke insulation multimeters deliver impressive capability • Temperature Compensation
in a single unit. No longer do you need to go back to the truck, through app for establishing
shop, or tool crib to get the extra tool you need to get the job accurate baselines and rel-
done. They are rugged, reliable and easy to use, just what evant historical comparisons
you would expect from Fluke. It all adds up to a breakthrough • Historical tracking and
solution that saves you time and money. trending of assets identi-
fies degradation over time,
allows real-time decisions
to be made in the field with
Fluke Connect® Assets (sold
separately)

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Product Comparison Charts on page 11.
Key features
• Insulation test
1587 FC: 0.01 MW to 2 GW
1577: 0.1 MW to 600 MW
• Insulation test voltages
1587 FC: 50 V, 100 V, 250 V, 500 V, 1000 V
1577: 500 V, 1000 V
• PI/DAR timed ratio tests (1587 FC only) with enhanced
FC TrendIt™ graphs identifies problems faster
• Memory storage through Fluke Connect eliminates writing
down results, reduces errors and saves data for historical
tracking over time
• Temperature Compensation for establishing accurate baselines
and relevant historical comparisons
• Auto-discharge of capacitive voltage
• Measure ac/dc voltage, dc millivolts, ac/dc milliamps, resistance,
and continuity beeper
• Fluke 1587 FC includes capacitance, diode test, temperature,
min/max, and frequency
• VFD Low-pass filter for variable-speed motor drive measurements
(1587 FC only)
• Live circuit detection prevents insulation test if voltage > 30 V is
detected for added user protection
• Large display with backlight
• Auto Power Off to save battery life

Recommended for:
Fluke 1587 FC: Industrial plant maintenance,
industrial and utilities electricians, field
service contractors and commercial HVAC/R
technicians
Fluke 1577: Electrical contractors and
commercial electricians

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 Insulation resistance testing
in the palm of your hand

Fluke 1507/1503
Insulation Resistance Testers
With their multiple test voltages, the compact Fluke 1507 and
1503 Insulation Testers are ideal for many troubleshooting,
commissioning, and preventative maintenance applications.
Additional features, like the remote probe on these tools,
reduces the time needed to perform repetitive testing.

The Fluke 1507 is the best compact, lightweight, handheld Key features
insulation tester for advanced industrial and electrical insula-
• Insulation test range
tion testing. Its full feature set offers the ability to easily and
1507: 0.01 MΩ to 10 GΩ
quickly perform advanced insulation resistance testing. Its
1503: 0.1 MΩ to 2000 MΩ
handy size makes it easy to pack and use. And its reasonable
price makes it an excellent value. • Insulation test voltages
1507: 50 V, 100 V, 250 V, 500 V, 1000 V
For basic electrical insulation testing, choose the compact 1503: 500 V, 1000 V
Fluke 1503—a rugged, compact tool that handles the most • Save both time and money with automatic
common tests at a most affordable price. calculation of Polarization Index and Dielectric
Absorption Ratio (1507 only)
• Make repetitive tests simple and easy with the
Compare (Pass/Fail) function (1507 only)
• Repetitive or hard-to-reach testing is easy with
the remote test probe
• Live circuit detection prevents insulation test
if voltage > 30 V is detected for added user
protection
• Auto-discharge of capacitive voltage for added
user protection
• AC/DC voltage: 0.1 V to 600 V
• Lo ohms/earth-bond continuity (200 mA)
• Resistance: 0.01 Ω to 20.00 KΩ
Recommended for: • Remote probe, test leads, probes and alligator
Fluke 1507: Electrical contractors, clips included with each tester
industrial and commercial electricians • One-year warranty
Fluke 1503: Residential and
commercial electricians

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Product Comparison Charts on page 11.
 Digital insulation testing
up to 10 kV

Fluke 1555/1550C Insulation

Resistance Testers
The new 1555 and redesigned Fluke 1550C insulation
resistance testers, offer digital insulation testing up to
10 kV, making them ideal for testing a wide range of
high voltage equipment including switchgear, motors,
generators and cables. Fluke insulation testers can now
conduct the entire range of test voltages specified in IEEE
43-2000 with a best in class, three-year warranty and Key features
CAT IV 600 V safety rating. With measurement storage • Test voltages up to 10 kV provides solutions for
and PC interface, the 1555 and 1550C are perfect tools all applications
for preventative or predictive maintenance programs • CAT III 1000 V, CAT IV 600 V safety rating
designed to identify potential equipment failures before • Voltage breakdown detection alerts the user
they occur. that voltage is present and gives the voltage
reading up to 600 V ac or dc for increased user
safety
• Selectable test voltages in 50 V steps from
250 V to 1000 V, and 100 V steps above 1000 V
• Measurements can be stored in up to 99
memory locations, with each location assigned
a unique, user defined, label for easy recall
• Long battery life gives the user over 750 tests
between charges
• Automatic calculation of Dielectric Absorption
(DAR) and Polarization Index (PI) with no addi-
tional setup
• Guard system eliminates the effect of
surface leakage current on high-resistance
measurements
• Large digital/analog LCD for easy viewing
Recommended for: • Capacitance and leakage current measurement
Fluke 1555 and 1550C: Industrial • Ramp function for breakdown testing
electricians, utility troubleshooters, • Resistance measurements up to 2 TΩ
engineers and technicians • Timer settings up to 99 minutes for timed tests
• Three-year warranty

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 Fluke has created combo kits to help maximize your
productivity and help you solve problems faster and
reduce downtime, all with significant savings over
buying each product individually.

The products in each kit have been specifically

selected for both troubleshooting and preventative
maintenance applications.

Establishing preventative maintenance programs

are becoming critical to maintaining the uptime of
electrical equipment and can significantly reduce
both planned and unplanned downtime. Unplanned
downtime costs are difficult to calculate, but often
significant. For some industries, it can represent
1 % to 3 % of revenue (potentially 30 % to 40 % of
Fluke combo kits profits) annually.

Fluke 1587 FC ET Includes:

Advanced Electrical • Fluke 1587 FC: Perform insulation tests, plus a wide
Troubleshooting Kit
range of DMM tasks with confidence and ease
• Fluke i400: Use with your 1587 FC to accurately
measure AC current without breaking the circuit
• Fluke 62 Max +: Check for hot spots and mea-
sure temperature with the 62 Max + non-contact
thermometer

MDT Advanced Includes:

Motor and Drive • Fluke 1587 FC: Perform insulation tests, plus a wide
Troubleshooting Kit range of DMM tasks with confidence and ease
• Fluke i400: Use with your 1587 FC to accurately
measure ac current without breaking the circuit
• Fluke 9040: Check the rotation of three-phase
motors easily and safely

Fluke 1555 Includes:

Insulation • Fluke 1555 Insulation Resistance Tester
Resistance
• Fluke IP67 Hard Case
Tester Kit
• Ruggedized Alligator Clips
• NIST Traceable Certificate of Calibration

Fluke 1550C Includes:

Insulation • Fluke 1550C Insulation Resistance Tester
Resistance
• Fluke IP67 Hard Case
Tester Kit
• Ruggedized Alligator Clips
• NIST Traceable Certificate of Calibration

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Choose the best fit

Two in one tools Stand-alone tools

Insulation test 1587 FC 1577 1503 1507 1550C 1555
features
50 V, 100 V, 250 V, 50 V, 100 V, 250 V,
Test voltages 500 V, 1000 V
500 V, 1000 V 500 V, 1000 V
500 V, 1000 V
250 V to 5000 V 250 V to 10,000 V

Insulation
0.01 MΩ to 2 GΩ 0.01 MΩ to 600 GΩ 0.01 MΩ to 2000 GΩ 0.01 MΩ to 10 GΩ 250 k to 1 TΩ 250 k to 2 TΩ
resistance range
PI/DAR • • • •
Auto discharge • • • • • •
Timed ramp test
(Breakdown) • •
Pass/fail
comparison • • •

Est. # of IRT tests 1000 1000 2000 2000 Various Various

Voltage > 30 V warning • • • • • •

With Fluke Connect
Memory App • •
Remote test probe • • • •
Lo ohms/earth-bond 200 mA source 200 mA source
continuity
1
(10 mΩ resolution) (10 mΩ resolution)

Digital LCD/analog Digital LCD/analog

Display Digital LCD Digital LCD Digital LCD Digital LCD
display display

Hold/lock • • • • • •
Multimeter features
AC/DC volts • •
Current • •
Resistance • •
Note: Not all product features and specifications are listed in this table.
Continuity beeper • • For more complete information, see individual product data sheets.
Temperature
(contact) • Footnotes:
1 Function useful for checking connections and motor windings.

Lo-pass filter
2
• Also useful for users who are required to perform earth-bond continuity
measurements during installation testing.
Capacitance • 2 Filter for variable-speed motor drive measurements.
Diode test •
Frequency •
MIN/MAX •
Other features
Backlight • • • •
Fluke Connect FlukeView® Forms Fluke View® Forms
Software compatible Basic Basic

Warranty Thee-years* Thee-years One-year One-year Thee-years Thee-years

4 AA (NEDA 15A 4 AA (NEDA 15A 4 AA (NEDA 15A 4 AA (NEDA 15A

Battery or IEC LR6) or IEC LR6) or IEC LR6) or IEC LR6)
Rechargeable Rechargeable

*Extendable to five years with if registered within 45 days of purchase.

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Insulation resistance support
Fluke not only has a full line of insulation resistance products to
cover every application, we also provide application notes, online
webinars, case studies, and expert technical support to help
you stay up and running. From “how-to” guides to industry and
product specific case studies, Fluke is dedicated to providing you
with technical support.

Every need—and every budget:

Learn about the entire range of Fluke insulation resistance
testers. See your Fluke sales representative or visit

Fluke. Keeping your world

up and running.®

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