MIT515, MIT525, MIT1025, MIT1525
5, 10 & 15 kV DC Insulation Resistance Testers
MIT515, MIT525, MIT1025, MIT1525
5, 10 & 15 kV DC Insulation Resistance Testers
DESCRIPTION
The new range of insulation resistance testers (IRTs) are smaller
and lighter than previous models yet offer advanced features
and rapid charge capability. The range consists of four models;
an entry level 5 kV and three fully featured units, one 5 kV
one 10 kV and a 15kV. Resistance measurement up to 10 TΩ
for the 5 kV models, 20 TΩ for the 10 kV model and 40 TΩ for
the 15 kV model.
A key productivity feature is the ability to take measurements
when connected to line power/mains with a dead battery.
Intelligent battery charging ensures the optimum charge rate
as a function of battery level, resulting in minimum charge
times.
The rugged case provides ultimate protection for a portable
instrument and a clip-on lead pouch ensures that leads remain
with the instrument at all times. The case lid is removable for
improved terminal access. IP rating is IP65 with the case closed
preventing water/dust ingress. High reliability and safety are
built in; all models are safety rated to CATIV 600 V and are
double insulated.
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.
Simplicity of operation is achieved with two rotary switches
and the large backlight display enables multiple results to be
displayed simultaneously.
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.
FEATURES AND BENEFITS
10 TΩ (5 kV) / 20 TΩ (10 kV) / 40 TΩ (15 kV)
max. insulation resistance
Timed IR plus PI and DAR diagnostic tests
Operate with dead battery when on line power/mains
Rapid charge Li-ion battery – up to 6 hrs continuous
testing (5 kV)
Dedicated voltmeter function (30 V to 660 V)
CATIV 600 V safety rating
Large LCD display with automatic backlight
Noise filter – rejects up to 3 mA noise
High altitude operation up to 3000 m
MIT525/1025 ADDITIONAL FEATURES
Dielectric Discharge (DD), Step Voltage (SV) and ramp
test functions
Advanced memory with time/date stamp, on screen
recall
Real time clock
Download of memory via isolated USB (type B) interface
(USB cable to PC)
PowerDB Lite asset management software
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
Measures up to 40 TΩ
PI, DAR, DD, SV and ramp test
Improved productivity – operate from line
power/mains if battery dead
Li ion battery - extended capacity, rapid
charge
Advanced memory with time/date stamp
CATIV 600 V safety rating
MIT1525 < xxx ms/uF to discharge
from 15000 V to 50 V
Capacitance range 10 nF to 25 μF (dependant on
(above 500 V): measurement voltage)
Capacitance accuracy (23 °C): ±10% ±5 nF
Voltage output accuracy +4%, -0%, ±10 V nominal test
voltage (>200 V, 0 °C to 30 °C):
at 1 GΩ
Current measurement range: 0.01 nA to 6 mA
Current measurement
accuracy (23 °C): ±5% ±0.2 nA at all voltages
Interference (noise) rejection:
MIT515, MIT525 1 mA per 250 V up to a maximum of
3 mA
MIT1025 1 mA per 600 V up a maximum of
3 mA
MIT1525 4 mA
Voltmeter range: 30 V to 660 V ac or dc, 50/60 Hz
Voltmeter accuracy: ±3%, ±3 V
Timer range: Up to 99 minutes, 15 second
minimum setting
Memory capacity:
5½ hours continuous logging every 5
s.
or 33 logged PI tests
or 350 logged IR tests
MIT1525 11 hours continuous
logging every 5 s.
Test regimes:
MIT515 IR, IR(t), DAR, PI
MIT525, MIT1025 IR, IR(t), DAR, PI, SV, DD, ramp test
Interface: USB type B (device)
Real time output: USB, 1 reading/second (voltage,
current and resistance)
ENVIROMENTAL CONDITIONS
Altitude: 3000 m, CAT rating maintained
>2000 m*
* Test leads connected
4000 m (MIT1525 only)
Operating temperature -20 °C to 50 °C
Storage temperature: -25 °C to 65 °C
Humidity: 90% RH non-condensing at 40 °C
Ingress protection: IP65 (lid closed), IP40 (lid open)
GENERAL SPECIFICATION
Safety: Meets the requirements of IEC 61010-1, CATIV 600 V
EMC: Meets the requirements of IEC61326-1
Dimensions
MIT515, MIT525, MIT1025: L 315 mm x W 285 mm x H 181 mm
Weight: 4.5 kg
MIT1525: 360 mm x W 305 mm x H 194 mm
Weight: 6.5 kg
“spot test”, a 1 minute IR test and a 10 minute Polarisation
Index (PI) test, where PI is the ratio R10min/R1min and
temperature independent.
ELECTRICAL SPECIFICATIONS
Voltage input range: 85-265 V rms, 50/60 Hz, 60 VA
Battery: 11.1 V, 5.2 A hour, meets IEC
62133:2003
Battery life
MIT515, MIT525: Typical capacity 6 hours continuous
at 5 kV with a 100 MΩ load
MIT1025: Typical capacity 4.5 hours
continuous at 10 kV with a 100 MΩ
load
Battery charge time: 2.5 hours from deep discharge,
2 hours normal discharge
MIT1525: Typical capacity 6 hours continuous
at 15 kV with a 100 MΩ load
30 min. quick charge: 1 hour operation at 5 kV, 100 MΩ
Test voltages
MIT515, MIT525: 250 V, 500 V, 1000 V, 2500 V,
5000 V
MIT1025: 500 V, 1000 V, 2500 V, 5000 V,
10000 V
User defined test voltage:
MIT515, MIT525 100 V to 1 kV in 10 V steps,
1 kV to 5 kV in 25 V steps,
MIT1525: 1000 V, 2500 V, 5000 V,
10000 V, 15000 V
MIT1025 5 kV to 10 kV in 25 V steps
MIT1525 10 kV to 15 kV in 25 V steps
Accuracy (23 °C):
MIT515, MIT525 accuracy (23 °C)
5000 V 2500 V 1000 V 500 V 250 V
±5% to 1 TΩ 500 GΩ 200 GΩ 100 GΩ 50 GΩ
±20% to 10 TΩ 5 TΩ 2 TΩ 1 TΩ 500 GΩ
MIT1025 accuracy (23 ºC)
15 kV 10 k V 2500 V 5000 V 1000 V
±5% to 3 TΩ 2 TΩ 1 TΩ 500 GΩ 200 GΩ
±20% to 40 TΩ 20 TΩ 10 TΩ 2 TΩ 1 TΩ
Guard : 2% error guarding 500 kΩ leakage
with 100 MΩ load
Display range analogue: 100 kΩ to 10 TΩ
Display range digital:
MIT515, MIT525 10 kΩ to 10 TΩ
MIT1025 10 kΩ to 20 TΩ
Short circuit current: 3 mA nominal, max. power on all
loads outperforming many 5 mA
testers
Insulation alarm: 100 kΩ to 1 GΩ
Capacitor charge:
MIT515, MIT525 <3 s/μF at 3 mA to 5 kV
MIT1025 <5 s/μF at 3 mA to 10 kV
MIT1525 < x s/uF at 3 mA to 15 kV
Capacitor discharge:
MIT515, MIT525 <250 ms/μF to discharge from
5000 V to 50 V
MIT1025 <500 ms/μF to discharge from
10000 V to 50 V
MIT515, MIT525, MIT1025, MIT1525
5, 10 & 15 kV DC Insulation Resistance Testers
TEST LEADS SUPPLIED
The MIT515. MIT525 and the MIT1025 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.
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
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 CATIV environment.
Cable insulation rating:
12 kV dc (marked on cable)
Cable type: flexible dual
insulated silicon (inner
insulation layer coloured
white to highlight damage
LARGE INSULATED TEST CLIP 3 m X 3 LEADSET
These test leads are supplied as standard on MIT1025.
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 and 10 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
CATIV environment.
Cable insulation rating:
12 kV dc (marked on cable)
Cable type: flexible dual
insulated silicon (inner
insulation layer coloured white
to highlight damage)
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 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 an 10 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.
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.
MIT515, MIT525, MIT1025, MIT1525
5, 10 & 15 kV DC Insulation Resistance Testers
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.
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 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 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 and MIT1025 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 and
10 kV insulation tester lead sets application note. This
document can be downloaded from: www.megger.com
PRACTICAL JAW DESIGN
Curved jaws allow reliable connection around test pieces and
flat jaw tips provide excellent connection and gripping of
individual wires.
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.
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)
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.
MIT515, MIT525, MIT1025, MIT1525
5, 10 & 15 kV DC Insulation Resistance Testers
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, Täby SWEDEN, Ontario
CANADA, Trappes FRANCE, Oberursel
GERMANY, Aargau SWITZERLAND, Dubai
UEA, Mumbai INDIA, Durban SOUTH AFRICA,
Chonburi THAILAND, Malaga SPAIN
CERTIFICATION ISO
Registered to ISO 9001:2008 Cert. no. Q 09250
Registered to ISO 14001-2004 Cert. no. EMS 61597
MIT515_525_1025_DS_en_V05
www.megger.com
Megger is a registered trademark
ORDERING INFORMATION
Item (Qty) Cat. No.
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-?
MIT1525-?
MIT1525-?
Included Accessories
User guide CD
Power lead
3 m leadset x 3, medium insulated clips 1002-531
3 m leadset x 3, large insulated clips (MIT1025 only) 1002-534
Included Accessories (MIT525, MIT1025)
USB cable 25970-041
PowerDB Lite software
Optional Accessories
1 kV test lead sets
Fused test probe and clip lead set 1002-913
Control circuit test lead set 6220-822
Item (Qty) Cat. No.
Optional Accessories
HV test leads
5 m leadset x 3, large insulated clips* 1002-645
8 m leadset x 3, large insulated clips 1002-646
10 m leadset x 3, large insulated clips 1002-647
15 m leadset x 3, large insulated clips 1002-648
5 m leadset x 3, medium insulated clips* 1002-641
8 m leadset x 3, medium insulated clips 1002-642
10 m leadset x 3, medium insulated clips 1002-643
15 m leadset x 3, medium insulated clips 1002-644
*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 m leadset x 3, bare compact clips 8101-181
8 m leadset x 3, bare compact clips 8101-182
15 m leadset x 3, compact bare clips 8101-183
Screened HV test lead sets
3 m, 5 kV screened un-insulated small clips 6220-835
15 m, 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
Other
CB101, 5 kV calibration box 6311-077
Calibration certificate - CB101 1000-113
UKAS calibration certificate CB101 1000-047
MIT515, MIT525, MIT1025, MIT1525
5, 10 & 15 kV DC Insulation Resistance Testers
