Megger MIT1025, MIT1525, MIT515 Specifications
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
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