MIT515, MIT525, MIT1025, MIT1525
5 kV, 10 kV, 15 kV DC Insulation Resistance Testers
MIT515, MIT525, MIT1025, MIT1525
5 kV, 10 kV, 15 kV DC Insulation
resistance testers
Measures up to 30 TΩ
Safety rated up to CAT IV 1000 V to 3000 m
Unique dual-case design - additional user
protection
Operates from battery or AC mains supply
Rapid charge Li-ion battery
Advanced memory with time/date stamp
DESCRIPTION
Megger’s new range of DC insulation testers MIT515, MIT525,
MIT1025 and MIT1525 are targeted at original equipment
manufacturers and industrial companies. The top of the range
MIT1525 performs insulation resistance tests up to 15 kV with a
30 TΩ maximum resistance and an accuracy of ±5 % from 1 MΩ
up to 3 TΩ. The MIT515 offers IR, DAR and PI functions but has no
memory functionality. MIT525, MIT1025 and MIT1525 have a full
suite of test modes as well as on-board memory and the ability to
stream data/download data to a PC/laptop. Instrument productivity
is a focus of the new MIT range which offers rapid charge batteries
and operation from an AC source if the batteries are flat. Rapid
charge batteries enable > 60 minutes testing after a 30 minute
charge.
MIT515: 5 kV IRT with PI and DAR but no memory
MIT525: 5 kV IRT with all test modes including a ramp test plus
advanced memory functions with recall to screen, RTC for time/dat
stamp of results and USB cable interface to PC/PowerDB
MIT1025: 10 kV IRT with all test modes including a ramp test plus
advanced memory functions with recall to screen, RTC for time/dat
stamp of results and USB cable interface to PC/PowerDB
MIT1525: 15 kV IRT with all test modes including a ramp test plus
advanced memory functions with recall to screen, RTC for time/dat
stamp of results and USB cable interface to PC/PowerDB
Safety rating is not compromised on the MIT range with all terminals
safety rated to CAT IV 600 V to 3000 m (5 kV, 10 kV) or CAT IV
1000 V to 3000 m (15 kV). A range of 5 kV and 10 kV test leads are
available plus dedicated 15 kV test leads which are double insulated
with clips designed for 15 kV creepage paths. The 15 kV leads are
supplied in a holdall. Suitably rated HV gloves and other personal
protection equipment are required to be worn when testing.
The MIT range share dual case design which includes a tough
outer case to protect the tester from knocks/drops and an inner
fire retardant case. The IP rating is IP 65 case closed eliminating
moisture and dust ingress.
An intuitive user interface ensures no lost time remembering how
to use the tester. Simplicity of operation is achieved with two rotary
switches and the large backlight display which enables multiple
results to be displayed simultaneously. A graphical quick start guide
is provided inside the lid to assist first time users.
Five preset voltage ranges are provided in insulation test mode, plus
a user settable lock voltage range. Preconfigured diagnostic tests
include Polarisation Index (PI), Dielectric Absorption Ratio (DAR),
dielectric discharge (DD), Stepped Voltage (SV) and ramp test.
Advanced memory storage includes time/date stamping of results,
logging of data and recall of results to screen. A fully isolated
USB interface is used for safe transfer of data to Megger’s asset
management software; PowerDB Pro, Advanced and Lite packages.
Test leads are double insulated t with clamps rated at 3 kV t
equivalent to 6 kV single insulation for the medium clip leadset and
5 kV t equivalent to 10 kV single insulation for the large clip. The
15k V leadset is insulated to 15 kV.
Advanced memory storage includes time/date stamping of results,
logging of data and recall of results to screen. A fully isolated USB
device interface (type B) is used for safe transfer of data to Megger’s
PowerDB / Pro, Advanced and Lite asset management software.
(MIT525, MIT1025 nd MIT1525 only)
APPLICATION
The Insulation Resistance (IR) test is a quantitative test which
indicates the effectiveness of a product’s electrical insulation.
Applications include cables, transformers, motors/generators,
circuit breakers and bushings. Common insulation tests are the
“spot test”, a 1 minute IR test and a 10 minute Polarisation Index
(PI) test, where PI is the ratio R10min / R1min and is temperature
independent.
FEATURES AND BENEFITS
Insulation resistance up to 30 TΩ @ 15 kV, 20 TΩ @ 10kV, 10 TΩ
@ 5 kV
IR, Timed IR, DAR, PI, DD, SV and ramp diagnostic tests
High current – 3 mA short circuit current
High noise immunity – 3 mA (5 kV and 10 kV) 6 mA (15 kV) of
noise rejection
Li-ion battery – up to 6 hrs continuous testing @ 5 kV with a
100M load, battery meets IEC 2133
Safety rating: CAT IV 600 V to 3000 m (5 kV, 10 kV) CAT IV 1000
V to 3000 m (15 kV)
Large LCD display with backlight
Dedicated voltmeter function (30 V to 660 V)
Advanced memory, on screen recall and real time clock for date/
time stamped results (MIT525, MIT1025 and MIT1525 only)
Download of on-board results via USB interface (MIT525,
MIT1025 and MIT1525 only)
Recorded temperature (measured by independent instruments)
can be saved with test result (MIT525, MIT1025 and MIT1525
only)
PowerDB Lite asset management software supplied (MIT525,
MIT1025 and MIT1525 only)
MIT515, MIT525 and MIT1025 safety rated at CAT IV 600 V
(maintained to 3000 m altitude)
MIT1525 safety rated at CAT IV 1000 V (maintained to 3000 m
altitude)
SPECIFICATIONS
AC voltage (auto-ranging) 5 kV, 10 kV: 90-264 V rms, 47-
63 Hz 100 VA
15 kV: 90-264 V rms, 47- 63 Hz
200 VA
Battery charge time 2.5 hours deep discharge,
2 hours normal discharge
Battery life
11.1 V, 5.2Ah Li-ion batteries, meet IEC 62133:2003, MIT1525 has
2 battery packs
Battery life MIT515, MIT525: 6 hours (typical) continuous
testing at 5 kV with a 100 MΩ load
Battery life MIT1025: 4.5 hours (typical) continuous
testing at 10 kV with a 100 MΩ load
Battery life MIT1525: 4.5 hours (typical) continuous
testing at 15 kV with a 100 MΩ load
Test voltage
MIT515, MIT525:
250 V, 500 V, 1000 V, 2500 V, 5000 V, VL
MIT1025:
500 V, 1000 V, 2500 V, 5000 V, 10000 V, VL
MIT1525:
1000 V, 2500 V, 5000 V, 10000 V, 15000 V, VL
Lock test voltage
100 VL to 1 kV in 10 V steps,
1 kV to 5 kV in 25 V steps,
5 kV to 15 kV in 25 V steps
Test voltage accuracy +4%, -0%, ±10 V nominal test
voltage at 1 GΩ load (0°C to
30°C)
Resistance range 10 kΩ to 15 TΩ @ 5 kV,
10 kΩ to 20 TΩ @ 10 kV,
10 kΩ to 30 TΩ @ 15 kV
Accuracy
MIT515, MIT525 accuracy (23 °C)
5000 V 2500 V 1000 V 500 V 250 V
±5% from 1MΩ to
1 TΩ 500 GΩ 200 GΩ 100 GΩ 50 GΩ
±20% from 1MΩ to
10 TΩ 5 TΩ 2 TΩ 1 TΩ 500 GΩ
MIT1025 accuracy (23 ºC)
10 kV 5000 V 2500 V 1000 V 500 V
±5% from 1MΩ to
2 TΩ 1 TΩ 500 GΩ 200 GΩ 100 GΩ
±20% from 1MΩ to
20 TΩ 10 TΩ 5 TΩ 2 TΩ 1 TΩ
MIT1525 accuracy (23 ºC)
15 kV 10 kV 5000 V 2500 V 1000 V
±5% from 1MΩ to
3 TΩ 2 TΩ 1 TΩ 500 GΩ 200 GΩ
±20% from 1MΩ to
30 TΩ 20 TΩ 10 TΩ 5 TΩ 2 TΩ
Guard terminal performance Guards out parallel leakage
resistance down to 250 kΩ with
a maximum additional resistance
error of 1% with a 100 MΩ load
Display Analogue: 100 kΩ to 10 TΩ
Digital: 10 kΩ to max a above
Short circuit/charge current 3 mA @ 5 kV, 10 kV, 15 kV
Insulation test Alarm: 100 kΩ to 10 GΩ
2
Capacitor charge
MIT515, MIT525 <3 s/μF at 3 mA to 5 kV
MIT1025 <5 s/μF at 3 mA to 10 kV
MIT1525 <7.5 s/μF at 3 mA to 15 kV
Capacitor discharge <120 ms/μF to discharge from
5000 V to 50 V (MIT515 and
MIT525)
<250 ms/μF to discharge from
10000 V to 50 V (MIT1025)
<3500 ms/μF to discharge from
15000 V to 50 V (MIT1525)
Capacitance range
With test voltage set
above 500 V
MIT515, MIT525 MIT1025:
10 nF to 25 μF
MIT1525:
10 nF to 50 μF
ENVIRONMENTAL
Maximum altitude 3000 m (5 kV, 10 kV)
3000 m (15 kV)
Operating temperature range -20 °C to 50 °C
Storage temperature range -25 °C to 65 °C
Humidity 90% RH non-condensing at 40 °C
IP rating IP65 (lid closed), IP40 (lid open)
SAFETY
MIT515, MIT525 MIT1025: CAT IV 600 V to 3000 m altitude
MIT1525: CAT IV 1000 V to 3000 m altitude
Meets the requirements of IEC 61010-1,
Capacitance measurement
accuracy
Current range 0.01 nA to 6 mA
Current accuracy ±5% ±0.2 nA at all voltages (23
Interference
MIT515, MIT525: 3 mA from 450 V to 5 kV
MIT1025: 3 mA from 960 V to 10 kV
MIT1525: 6 mA from 2100 V to 15 kV
Voltmeter range 30 V to 660 V ac or dc,
Voltmeter accuracy ±3%, ±3V
Timer range Up to 99 minutes 59 seconds,
Memory capacity 5.5 hours logging @
Test modes MIT515: IR, IR(t), DAR, PI
Interface USB type B (device)
Real time output 1 Hz output readings (V, I, R)
±10% ±5 nF
°C)
45Hz – 65Hz
15 second minimum setting
5 sec intervals
(MIT525, MIT1025 and MIT1525
only)
MIT525, MIT1025 and MIT1525:
IR, IR(t), DAR, PI, SV, DD, ramp
test
(MIT525, MIT1025 and MIT1525
only)
(MIT525, MIT1025 and MIT1525
only)
TEST LEADS SUPPLIED
The MIT515. MIT525, MIT1025 and the MIT1525 are all supplied
with test leads that are compliant with the requirements of
IEC61010-031:2008. The 5 kV models are supplied with one 3m
lead-set with medium sized clips. The 10 kV models are supplied
with two 3m lead-sets, one with medium sized clips and the other
with large clips with insulation suited to 10 kV use and the 15 kV
models supplied with a 3m lead-set, with large clips with insulation
suited to 15 kV use.
These leads are designed based on Megger’s extensive knowledge
of insulation testing using the latest technology. The leads are in
compliance with IEC61010-31:2008 which requires a fully insulated
clip design.
MEDIUM INSULATED TEST CLIP 3 M X 3 LEADSET 5 KV AND 10 KV
These test leads are supplied as standard on MIT515, MIT525 and
the MIT1025.
These clips are designed for clamping on larger diameter test pieces
but where space is at a premium.
The insulation is designed only to protect the user from the output
of Megger 5 kV and 10 kV (set below 6 kV) insulation resistance
testers. The clips cannot in any circumstance be relied on to protect
the user from live ac systems above 600 V a.c., r.m.s. in an CAT IV
environment.
Cable insulation rating: 12 kV dc (marked on cable)
Cable type: flexible
dual insulated silicon
(inner insulation layer
coloured white to
highlight damage
3
TEST LEADS SUPPLIED CONT.
MEDIUM INSULATED TEST CLIP 3 M X 3 LEADSET 15 KV
These test leads are supplied as an option on the MIT1525.
These clips are designed for clamping on larger diameter test pieces
but where space is at a premium.
The insulation is designed only to protect the user from the output
of Megger 15 kV (set below 6 kV) insulation resistance testers.
The clips cannot in any circumstance be relied on to protectthe
user from live ac systems above 1000 V a.c., r.m.s. in an CAT IV
environment.
Cable insulation
rating: 15 kV dc
(marked on cable)
Cable type: flexible
dual insulated silicon
(inner insulation layer
coloured white to
highlight damage
These test leads may also be supplied in none standard lengths to
suit a particular application.
Please contact Megger for a quotation. Minimum order quantities
may apply.
charge can be lethal and connections, including the leads and clips,
should never be touched during the test. The system must be safely
discharged before touching connections.
DESIGNED FOR EVERYDAY USE
Test leads are a key component of any precision instrument and
that safety, long life, and the ability to provide reliable connections
to a variety of test pieces found in everyday applications are of the
utmost importance. Megger design test leads for both safety and
practical operation.
LOCKING HV INSULATED PLUGS/NON-REMOVABLE
TEST CLIPS
All Megger 5 kV, 10 kV and 15 kV insulation testing test leads are
fitted with unique locking HV plugs and non-removable test clips.
This reduces the likelihood of a plug or clip inadvertently losing
electrical connection and the capacitance of a long cable remaining
lethally charged.
With the arrows on the plug finger guard horizontal on the
instrument as shown to lock. Twist 90º to to unlock. In addition,
for the same reason, the test clips are not removable from the test
lead.
LARGE INSULATED TEST CLIP 3 M X 3 LEADSET
These test leads are supplied as standard on MIT1025 and MIT1525
Models (different leadset dependant on model)
These clips are designed for clamping on larger diameter test pieces.
The insulation is designed only to protect the user from the output
of Megger 5 kV, 10 kV and 15 kV insulation resistance testers.
The clips cannot in any circumstance be relied on to protect the
user from live ac systems above 600 V a.c., r.m.s. in an CAT IV
environment.
10 kV lead set
Cable insulation rating:
12 kV dc (marked on cable)
Cable type: flexible dual
insulated silicon (inner
insulation layer coloured
white to highlight damage)
15 kV lead set
Cable insulation rating:
18 kV dc (marked on cable)
Cable type: flexible dual
insulated silicon (inner
insulation layer coloured
white to highlight damage)
PRACTICAL INSULATION DESIGN
Moving jaw fingers maintain the clips touch proof safety when clip
is closed but flex back to allow metal teeth of the clip to contact
test piece unimpeded when in use.
Megger clip being
tested with IEC
standard test
finger for creepage
and clearance.
PRACTICAL JAW DESIGN
Curved jaws allow reliable connection around test pieces
and flat jaw tips provide excellent connection and gripping
of individual wires.
The design of the lead sets is intended to facilitate connection
to a variety of de-energized systems for the purpose of making
insulation resistance measurements. In all cases it is the
responsibility of the user to employ safe working practices and
verify that the system is safe before connection. Even isolated
systems may exhibit significant capacitance which will become
highly charged during the application of the insulation test. This
4
OPTIONAL TEST LEADS
MEDIUM AND LARGE TEST CLIPS
Test leads above with medium and large size insulated clips are
available supplied as an option in 5m, 8m, 10m and 15m lengths.
These are listed in the ordering information panel at the end
of this data sheet. These test leads may also be supplied
in non-standard lengths to suit a particular application
/ requirement. Please contact Megger for a quotation,
minimum order quantities may apply.
Versions available for all MIT models
COMPACT TEST CLIP LEADS
These clips are designed for clamping on test pieces where access is
limited. There is no insulation on these clips.
Extreme care
must be taken to
avoid electric shock
when connecting/
disconnecting due
to the bare metallic
clips.
Cable insulation
rating: 12 kV dc
(marked on cable)
Cable type: flexible dual insulated silicon (inner insulation layer
coloured white to highlight damage)
Fits: MIT515, MIT525 and MIT1025
COMPACT TEST CLIP WITH 5 OR 10 KV SCREENED
CABLE
The clips are designed for clamping on test pieces where access is
limited. There is no insulation on these clips. Extreme care must
be taken to avoid electric shock when connecting/ disconnecting
due to the bare metallic clips.
The screened test lead set consists of:
A black/negative test lead that has been screened.
A red/positive test lead that is not screened.
Cable insulation rating: 5 kV or 10 kV dc
Cable type: flexible screened PVC
Note: Screened test leads
are an important accessory
for those working in high
noise environments, and/
or locations where test
lead leakage could be a
problem.
Fits: MIT515, MIT525 and
MIT1025
LARGE TEST CLIP WITH 15 KV SCREENED CABLE
Relative motion between unshielded long leads for a D.C. test
causes a variation in capacitance between them. This in turn causes
very low frequency currents to flow, creating interference with the
D.C. being measured. In addition induced current from nearby
cables or radiated noise from corona around HV bushings can
interfere with measurements causing unstable readings. This can be
greatly reduced by using a screened lead set.
The screened test lead set consists of:
A black/negative test lead that has been screened.
A red/positive test lead that is not screened.
Cable insulation rating: 15 kV dc
Cable type: flexible
screened PVC
Note: Screened test leads
are an important accessory
for those working in high
noise environments, and/
or locations where test lead
leakage could be a problem.
Fits: MIT1525
CONTROL CIRCUIT TEST LEAD SETS
This probe and clip leadset is designed for testing low voltage
circuits with test voltages up to 1 kV.
The insulation is designed only to protect the user from the output
of Megger 5 kV, 10 kV and 15 kV
insulation resistance testers set
to a maximum output voltage of
1 kV. Do not use this leadset at
voltages above 1 kV.
Cable insulation rating: 1 kV dc
FUSED TEST PROBE AND CLIP LEAD SET
This fused probe and clip leadset is designed for testing low
voltage circuits with test voltages up to 1 kV. The leadset is GS38
compliant, fitted with FF500mA 50 kA fuses, which allows voltage
measurements to be made in safety when using the user selectable
voltage measuring range on the MIT515, MIT525, MIT1025 and
MIT1525 instruments.
The insulation is designed only to
protect the user from the output of
Megger 5 kV and 10 kV insulation
resistance testers set to a maximum
output voltage of 1 kV. Do not use
this leadset at voltages above 1 kV.
Cable insulation rating: 1 kV
More detailed information can
be found on the 5 kV, 10 kV and 15 kV insulation tester lead
sets application note. This document can be downloaded
from: www.megger.com
5
MIT515 MIT525 MIT1025 MIT1525
Max. output voltage 5 kV 5 kV 10 kV 15 kV
Max. resistance 10 TΩ 10 TΩ 20 TΩ 30 TΩ
Accuracy from 1 MΩ to
Short circuit output current 3 mA 3 mA 3 mA 3 mA
Max. noise rejection 3 mA 3 mA 3 mA 6 mA
Four averaging filters
Safety rating (to max. altitude CAT IV 600 V CAT IV 600 V CAT IV 600 V CAT IV 1000 V
Max. altitude 3000 m 3000 m 3000 m 3000 m
Battery charge 2.5 hrs 2.5 hrs 2.5 hrs 2.5 hrs
Battery life single chg 6 hrs 6 hrs 4.5 hrs 4.5 hrs
Remote Control via USB * * *
±5% ≤ 1 TΩ
±20% to 10 TΩ
±5% ≤ 1 TΩ
±20% to 10 TΩ
±5% ≤ 2 TΩ
±20% to 20 TΩ
±5% ≤ 3 TΩ
±20% to 35 TΩ
USB interface
Bluetooth® memory download and live stream
On-board memory
Temperature value stored
Humidity value stored * * *
Time/Date stamped results
Compact / lightweight 4.5 kg 4.5 kg 4.5 kg 6.5 kg
Easy rotary switch operation
Digital/Analogue display
Display Backlight
Voltage output measurement
Dedicated voltmeter
Default voltmeter function
* Features available on S1 range only.
6
ORDERING INFORMATION
Description Order Code Description Order Code
MIT515-UK 1001-935
MIT515-US 1001-936
MIT515-EU 1001-937
MIT515-AU 1001-938
MIT525-UK 1001-939
MIT525-US 1001-940
MIT525-EU 1001-941
MIT525-AU 1001-942
MIT1025-UK 1001-943
MIT1025-US 1001-944
MIT1025-EU 1001-945
MIT1025-AU 1001-946
MIT1525 UK 1002-907
MIT1525 US 1002-909
MIT1525 EU 1002-908
MIT1525 AU 1002-910
Included Accessories
Power lead
USB cable
PowerDB Lite software
Product information CD
Included accessories (5 kV, 10 kV, 15kV)
3 m lead set, medium size insulated clips
(MIT515 and MIT525 only) 1002-531
3 m leadset x 3, large insulated clips
(MIT1025 only) 1002-534
3m leadset x 3, large 15 kV insulated clips
(MIT1525 only) 1002-949
Optional Accessories 1 kV test lead sets
(MIT515, MIT525, MIT1025 only)
Fused test probe and clip lead set 1002-913
CONTROL CIRCUIT TEST SET 6220-822
Optional accessories – 1 kV test lead sets
(MIT1525 only)
Fused test lead set with probes and clips
(2 x leads, 1.25m) 1005-265
Control circuit test lead set (2 x leads, 3m) 1005-264
HV test leads sest (MIT515, MIT525, MIT1025 only)
* These test leads may also be supplied in non-standard lengths to
suit a particular application / requirement. Please contact Megger
for a quotation, minimum order quantities may apply.
3 x 5 m with large insulated clips 1002-645
3 x 8 with large insulated clips 1002-646
3 x 10 m with large insulated clips 1002-647
3 x 15 m with large insulated clips 1002-648
3 x 5 m with medium insulated clips 1002-641
3 x 8 m with medium insulated clips 1002-642
3 x 10 m with medium insulated clips 1002-643
3 x 15 m with medium insulated clips 1002-644
COMPACT, BARE TEST CLIP: Lead length: 3 m 8101-181
COMPACT, BARE TEST CLIP: Lead length: 5 m 8101-182
COMPACT, BARE TEST CLIP: Lead length: 15 m 8101-183
HV test lead sets (MIT1525 only)
5 m lead set, large size insulated clips (3 x leads) 1005-259
10 m lead set, large size insulated clips (3 x leads) 1005-260
15 m lead set, large size insulated clips (3 x leads) 1005-261
3 m lead set, medium size insulated clips (3 x leads) 1005-262
10 m lead set, medium size insulated clips (3 x leads) 1005-263
Screened - HV test lead sets
(MIT515, MIT525, MIT1025 only)
1 x 3 m, wtih 5 kV screened un-insulated
small clips 6220-835
1 x 15 m, with 5 kV screened un-insulated
small clips 6311-080
3 m, 10 kV screened un-insulated small clips 6220-834
10 m, 10 kV screened un-insulated small clips 6220-861
15 m, 10 kV screened un-insulated small clips 6220-833
Screened HV test lead sets (MIT1525 only)
3 m, 15 kV screened, large size insulated clips,
supplied in carry holdall 1005-266
10 m, 15 kV screened, large size insulated clips,
supplied in carry holdall 1005-267
15 m, 15 kV screened, large size insulated clips,
supplied in carry holdall 1005-268
20 m, 15 kV screened, large size insulated clips,
supplied in carry holdall 1005-269
Other
CB101; 5 kV Calibration Box 6311-077
Calibration certificate - CB101 1000-113
UKAS calibration certificate CB101 1000-047
UK
Archcliffe Road Dover
CT17 9EN England
T +44 (0) 1304 502101
F +44 (0) 1304 207342
UKsales@megger.com
UNITED STATES
4271 Bronze Way
Dallas TX 75237-1019 USA
T 800 723 2861 (USA only)
T +1 214 333 3201
F +1 214 331 7399
USsales@megger.com
OTHER TECHNICAL SALES OFFICES
Valley Forge USA, College Station USA,
Sydney AUSTRALIA, Danderyd SWEDEN,
Ontario CANADA, Trappes FRANCE,
Oberursel GERMANY, Aargau SWITZERLAND,
Kingdom of BAHRAIN, Mumbai INDIA,
Johannesburg SOUTH AFRICA, Chonburi THAILAND
7
CERTIFICATION ISO
Registered to ISO 9001:2000 Cert. no. Q 09290
MIT515--MIT525--MIT1025--MIT1525_DS_en_V06
www.megger.com
Megger is a registered trademark
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