Megger BM5200 Data sheet

BM5200

Insulation Resistance Tester

 1 TΩ, 1.4 mA, 5 kV digital insulation tester with

digital and analogue display

 Five test ranges; 250 V, 500 V, 1000 V, 2500 V

and 5000 V

 Insulation (InS), Polarisation Index (PI) and

variable timed test (t) modes

 Selectable DC or AC (incl. frequency) voltmeter

functions

 Guard terminal to shunt surface leakage

currents

 CATIII 600 V safety rating

BM5200

Insulation Resistance Tester

DESCRIPTION

The Megger BM5200 tester is a battery powered instrument with
digital and analogue arc display, designed for high voltage insulation
resistance testing in the maintenance and servicing of cables,
rotating plant machinery, transformers, switchgear and industrial
installations.

DC insulation tests are performed at 250 V, 500 V, 1000 V, 2500
V and 5000 V. Insulation resistance measuring range is 100 kΩ to
1000 GΩ. Automatic discharge for capacitive circuits under test is
provided and decaying voltage displayed.

The guard terminal can be used to minimise the effects of surface
leakage and hence erroneous measurements when carrying out
insulation resistance tests.

Three insulation resistance (IR) test modes are provided, (InS, PI
and t) and available in any IR test range. In IR mode (InS) tests are
initiated by pressing and holding down the TEST button for two
seconds and terminated by a second press of the TEST button.
A Polarisation Index (PI) mode performs a ratio metric test that
calculates the ratio of insulation resistance at ten minutes to
insulation resistance at one minute. The IR test timer (t) mode
facilitates a single fixed time test based on the set time interval t.

For capacitive test objects the instrument will automatically
discharge through an internal resistor and indicate voltage across
the terminals in the range 25 V to 600 V with higher voltages
indicated by ‘>600 V’. This feature will give decaying voltage
indication following the testing of reactive loads. When the voltage
indicator disappears it is safe for the user to disconnect the test
leads.

The BM5200 is powered by eight 1.5 V IEC LR6 (AA) cells. Design
safety features include high voltage warning indicator, external
voltage display after IR test, automatic discharge of reactive loads
and test leads.

APPLICATION

Electrical insulating materials deteriorate with time leading to
breakdowns and costly repair bills. Insulation resistance testers
apply a regulated DC voltage across the insulation and measure
current flow through it applying Ohm’s law to calculate insulation
resistance. The current flows because no insulation material is
perfect.

IR tester uses include:

 Product test and qualification

 Installation of equipment

 Routine maintenance

 Problem resolutions

Insulation testing with high voltage DC affects insulation
polarisation such that consecutive testing without complete
discharge of the unit under test will yield different results.

Care should be taken to always employ the same process and
technique of connecting to and testing an insulator to be able to
trend results. It is important to record temperature of the insulation
as well as IR values.

FEATURES AND BENEFITS

 Compact, rugged insulation resistance tester

 Easy operation and voltage range selection

 AC and DC voltmeter (25 V - 600 V)

 User settable IR test timer (default 1 min), (max. 19 m 50 s)

 Soft carry case for instrument and leads

 Quick start and full user guide

 Locking HV insulated plugs for additional safety

 Shutters across terminals prevent accidental ingress of dirt and

other objects

SPECIFICATIONS

Insulation range 100 kΩ to 1 TΩ

Nominal test voltages 250 V, 500 V, 1000 V, 2500 V, 5000 V

Terminal voltage
accuracy

<1000 V 0...+10% of nominal test
voltage
≥1000 V 0...+5% of nominal test voltage

Insulation accuracy Up to 1 GΩ: All ranges ±5% ±2 digits

Over 1 GΩ:
5000 V ±5% ±0.04% per GΩ
2500 V ±5% ±0.08% per GΩ
1000 V ±5% ±0.2% per GΩ
500 V ±5% ±0.4% per GΩ
250 V ±5% ±0.8% per GΩ

Short circuit/charge

1.4 mA ±0.5 mA

current

Maximum capacitance

5 μF

of load

Voltmeter accuracy 3% ± 3 V

Frequency

45 Hz to 65 Hz

measurement

Frequency

±2 Hz

measurement accuracy

Voltmeter range up to 600 V a.c. or d.c.

Power supply 8 x LR6/AA batteries

Battery life 5 hours @ 5 kV into 100 MΩ with AA

Alkaline LR6

Guard 2% error guarding 5 MΩ leakage on 100

MΩ load

Operating temperature

-20 °C to +55 °C

range and humidity

Humidity 90% RH, 0 °C to 40 °C

70% RH, 40 °C to 55 °C

Storage temperature

-20 °C to +65 °C

range and humidity

IP rating IP40

Safety protection Insulation Cat III 600 V

Note Service error with stated environmental

limits is twice intrinsic error

EMC The product conforms to IEC 61326

Dimensions 220 mm x 115 mm x 163 mm

Weight 1.45 kg

UK

Archcliffe Road Dover
CT17 9EN England
T [phone]
F [phone]
[e-mail]

UNITED STATES

4271 Bronze Way
Dallas TX 75237-1019 USA
T 800 723 2861 (USA only)
T [phone]
F [phone]
[e-mail]

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

ORDERING INFORMATION

Description Order Code

BM5200 Insulation tester 1001-289

Included accessories

User guide

Quick start guide

Battery 1.5V alkaline AA (x8)

Carrying case with lead storage 6420-117

3 m lead set, medium size insulated clips 1002-531

CERTIFICATION ISO

Registered to ISO 9001:2008 Cert. no. Q 09290

Registered to ISO 14001-2004 Cert. no. EMS 61597

BM5200_DS_en_V03

www.megger.com

Megger is a registered trademark

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