MIT510/2, MIT520/2 and MIT1020/2
5-kV and 10-kV Insulation Resistance Testers
MIT510/2, MIT520/2 and MIT1020/2
5-kV and 10-kV Insulation Resistance Testers
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Line supply or battery operated
Digital/analog backlit display
Measurement range to 15 TΩ (MIT510/2
and MIT520/2) and 35 TΩ (MIT1020/2)
CAT IV 600 V safety rating
Automatic dielectric absorption ratio,
polarization index, step voltage, and
dielectric discharge tests (MIT520/2 and
MIT1020/2)
RS232 or USB download of results
(MIT520/2 and MIT1020/2)
Ingress protection to IP65
3 mA short circuit current
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DESCRIPTION
The new MIT510/2 and 520/2, 5-kV and MIT1020/2, 10-kV
insulation resistance testers are all designed specifically to
assist the user with the testing and maintenance of high
voltage equipment. The instruments are designed in a
landscape style which is more familiar and user friendly.
The MIT510/2 and MIT520/2 measures to 15 TΩ, replacing
the ambiguous “infinity” reading with an actual number
that can be used for predictive/preventive trending on the
highest quality insulation. Both units are supplied with test
leads with medium insulated clips.
The MIT510/2 has the facility to set the test voltage in
steps from 250 V to 5000 V and the MIT520/2 has the
ability to set the test voltage from 50 V to the maximum
output voltage.
The MIT1020/2 offers a measurement range to 35 TΩ in
order to provide trending values for the best of insulating
materials used on the higher capitalized equipment. The
model features an expanded test voltage range from 50 V
to 10 kV, in 10 V increments to 1 kV and 25 V increments
above. The MIT1020/2 is supplied with two sets of test
leads, one with medium insulated clips and the other with
large insulated clips.
All three instruments have a large, easy-to-read backlit LCD
making them equally suitable for use in both bright
sunlight and poorly lit environments. Information displayed
includes resistance, voltage, leakage current, capacitance,
battery status and time constant. In addition, the elapsed
time is displayed constantly, removing the need for
separate timers. The MIT520/2 and MIT1020/2 allow up to
3 timed measurement positions to be set, which simplifies
DAR testing.
A built-in integral timer starts automatically at the
beginning of a test, and displays in minutes and seconds.
At the end of any test, capacitive loads are automatically
discharged and the decaying voltage displayed. The timer
enables the performance of an automatic IR test with the
MIT510/2, while the MIT520/2 and MIT1020/2 add the
capability of preprogrammed DAR, PI, SV and DD. The
MIT520/2 and MIT1020/2 include a selectable breakdown
or burn mode and an alarm mode, which allows the
operator to preset a specific resistance level. The unit will
beep until the limit is exceeded. The controls of the
instruments are clear and unambiguous, and a “quick start”
guide is included in the lid, eliminating the need to carry
manuals to site locations.
Redundant safety features make the instruments fully
amenable to safe operation in the more demanding high
voltage environment. The CAT IV 600 V safety rating
means that the instruments are protected for use on
outside applications and are protected against impulses to
8 kV. Instrument design is in conformance with EN61010
for arc-flash protection. If the instrument is accidentally
connected to a live test item, external voltage will be
automatically displayed and testing inhibited above 50 V
(80 V on MIT1020/2). At the conclusion of a test,
dangerous static voltage on the test item is automatically
discharged and monitored on the display. All three models
are fitted with a guard terminal to enhance accuracy. The
guard test lead is included as standard with each
instrument.
MIT510/2, MIT520/2 and MIT1020/2
5-kV and 10-kV Insulation Resistance Testers
APPLICATIONS
All three models are designed for testing the insulation of
high-voltage electric equipment. Their wide voltage range
also allows applications for low-voltage equipment.
Generators, motors, transformers, cables and switchgear all
require effective maintenance. The test techniques on the
instruments provide valuable diagnostic information.
All three instruments test the insulation resistance of:
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With its higher voltage testing capability, the MIT1020/2 is
the perfect every day work tool for manufacturers, users
and maintainers of rotating machinery. Designed in
accordance with the requirements of IEEE43:2000 the
MIT1020/2 is ideal for measuring the insulation resistance
of armature and field windings in rotating machines rated
1hp (750 W) or greater. The standard applies to
synchronous, induction and dc machines as well as
synchronous condensers.
FEATURES AND BENEFITS
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CAT IV 600 V safety rating allows for safe use in the
widest range of applications.
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High-voltage power cables and high-voltage buses
Large motor/generator windings
Line and substation transformers
The MIT520/2 and MIT1020/2 also perform spot tests,
step-voltage tests, dielectric discharge tests and dielectric
absorption tests for the following applications:
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Acceptance testing at installation to check conformance
to specifications.
Routine preventive/predictive maintenance testing after
installation.
Quality assurance testing as part of the manufacturing
process.
Diagnostic testing to isolate faulty components for
repair.
Improved operating flexility provides the user with the
choice of using these instruments via line or battery
operation. Line operation also affords enhanced charging
capabilities for high-capacitance test samples.
High measurement range enables installation testing and
long-term trending of higher value apparatus.
3 mA short circuit current allows for faster charging and
testing of large capacitive and inductive loads.
Results storage and downloading enables state-of-the-art
record keeping free of transposition errors.
Five industry-standard tests can be performed
automatically, freeing operator from time-consuming
manual operations.
Backlit display enables ease of testing in poorly lit areas.
Rugged, lightweight polypropylene case and IP65 rating
make all of the instruments adaptable for all field
conditions.
A variety of measurements including applied test
voltage, leakage current and capacitance, affords
enhanced capabilities to diagnose insulation condition
and problems.
Redundant safety features includes automatic discharge
of test item, test inhibition in presence of external
voltage, and design to EN61010.
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The MIT1020/2 in use at an industrial complex
substation
Delta wye transformer being testing with a MIT520/2
MIT510/2, MIT520/2 and MIT1020/2
5-kV and 10-kV Insulation Resistance Testers
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The MIT1020/2 incorporates the ability to apply test
voltage up to 10 kV, making it fully conformable to the
requirements of IEEE 43:2000.
Industry best guard terminal performance to insure
highest accuracy of measured values.
For greater ease of use and downloading, an RS232 or
USB interface is available (MIT520/2 and MIT1020/2
only).
Alarm limit mode (MIT520/2 and MIT1020/2 only) allows
for faster testing and less ambiguous result
interpretation.
Short Circuit/Charge Current
3 mA
Current Measurement
Range:
±0.01 nA to ±5 mA
Accuracy (23ºC):
±5% ±0.2 nA at all voltages
Capacitance Measurement
Range: 10 nF to 50 µF (for voltages > 500 V)
Accuracy (23ºC): ±5% ±5 nF
Capacitor
Charge Time:
5 seconds per µF at 3 mA
Discharge Time:
5 seconds per µF to discharge from:
MIT510/2 and MIT520/2:
5000 V to 50 V
MIT1020/2:
10,000 to 50 V
Display
Analog/digital 3 digits
Timer Range
Count up to 99 minutes and 59 seconds from start of test
Memory Capacity (MIT520/2 and MIT1020/2)
32 kB
Industry-Standard Tests
MIT510/2:
Auto IR
MIT520/2:
Auto IR, PI, DAR, SV, and DD
MIT1020/2:
Auto IR, PI, DAR, SV, and DD
Interference Rejection
2 mA rms at 200 V and above
Guard Terminal
2% error guarding 500 kΩ leakage with 100 mΩ load
Voltage Input Range
95 to 240 V, ±10% rms 50/60 Hz and dc
Battery Life
6 hours continuous testing at 5 kV
4 hours continuous testing at 10 kV
Safety
Meets the requirements of EN61010-1: 2001 CAT IV 600 V
EMC
Meets the requirements of EN61326-1:1998 for use in heavy
industrial areas
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SPECIFICATIONS
Test Voltage
MIT510/2:
250 V, 500 V, 1000 V, 2500 V, 5000 V
MIT520/2:
50 V to 1 kV in 10 V steps, 1 kV to 5 kV in 25 V steps
MIT1020/2:
50 V to 1 kV in 10 V steps, 1 kV to 10 kV in 25 V
steps
Insulation Resistance Range
Digital display:
MIT510/2 and MIT520/2:
10 kΩ to 15 TΩ
MIT1020/2:
10 kΩ to 35 TΩ
Analog display:
MIT510/2, MIT520/2 and MIT1020/2:
100 kΩ to 1 TΩ
Accuracy (23º C)
±5% to 1 TΩ
±20% to 10 TΩ (MIT520/2)
±20% to 20 TΩ (MIT1020/2)
Voltage Output Accuracy (0ºC to 30ºC)
0 to +4% ±1 V of nominal test voltage at 100 MΩ load
±25 V for test voltages less than 500 V
5kV Voltage Characteristic
6
5
4
3
5kV
2.5kV
1kV
500V
250V
Ingress Protection
IP65 (lid closed)
Temperature Range
Operating:
-4ºF to 122ºF (-20ºC to +50ºC)
Storage:
-13ºF to +149ºF (-25ºC to +65ºC)
Humidity Range
90% RH @ 104ºF (40ºC)
kV
2
1
0
0
1
2
3
4
5
6
7
8
9
10
M Ohms
Dimensions
12 in. x 7.6 in. x 14.2 in. (305 mm x 194 mm x 360 mm)
Weight
15 lb. (6.75 kg)
Test Voltage Output Characteristics Over
Insulation Resistance Range
MIT510/2, MIT520/2 and MIT1020/2
5-kV and 10-kV Insulation Resistance Testers
These unique features improve insulation testing efficiency and effectiveness
Extra data storage and download capability
Run more tests and save more test data.
Download results using either an RS232 or USB
style connection (MIT520/2 and MIT1020/2 only).
Line or battery operation
The operating flexibility you need when site
conditions are unknown or long term testing is
required.
Multiple built-in safety features
Designed to meet the most stringent operator
safety requirements, including EN61010.
Includes live voltage warning, safety lockout
over 50 V on 5-kV testers and 80 V on 10-kV
testers, and automatic energy discharge.
Improved enclosure
It’s virtually indestructible, yet ergonomic
and lightweight. It features an oversized
rubber handle and removable lid for
effective use in tight places. A lid mounted
lead storage bag is also included.
Easier operation
Use a “Quick Start” guide conveniently located
in the lid, always there for easy reference.
MIT510/2, MIT520/2 and MIT1020/2
5-kV and 10-kV Insulation Resistance Testers
Product comparison guide.
A look at each instrument’s features.
MIT510/2
Display
Power Supply
Analog/Digital
Mains power
Rechargeable
10.0 kV
5.0 kV
2.5 kV
Test Voltage
1.0 kV
500 V
250 V
10 V steps 50 V to 1 kV,
25 V steps 1 kV to max test voltage
Max reading
Min reading
Measurements
Voltage
Capacitance and time constant
Leakage current
Auto IR
Polarization index
Test Types
Step voltage
Dielectric discharge
Dielectric absorption ratio
Timer control
Timer display
3mA test currents
Other Features
USB output
RS232 output
Free calibration certificate
IP65 rating
Alarm limit mode
Guard terminal performance
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MIT520/2
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MIT1020/2
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15 TΩ
10 kΩ
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15 TΩ
10 kΩ
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35 TΩ
10 kΩ
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2% error guarding 500 kΩ leakage with a 100 MΩ load
What is the IEEE Standard 43-2000?
In March 2000, the IEEE-SA Standards Board approved a
revision of IEEE Std 43-1974 by the Electric Machinery
Committee of the IEEE Power Engineering Society. This
revision is IEEE Std 43-2000, the “IEEE Recommended
Practice for Testing Insulation Resistance of Rotating
Machinery.”
Following is a brief summary of the highlights of IEEE
Standard 43-2000:
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Test results should be compared to historical values
to identify changes.
In lieu of historical records, minimum acceptable
values (based on the type of equipment) for both
tests are indicated.
Depending on the machine rating, the readings for
one or both tests should exceed the minimum
acceptable values.
If the readings are below the minimum acceptable
values, the winding is not recommended for an over-
voltage test or for operation.
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Test voltages up to 10 kV are recommended for windings
rated greater than 12 kV.
Both the insulation resistance and the polarization index
test are recommended.
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