246.84 089.862 .672 Cap. 022.812016.876015.348 089.862 .672 Cap.015.348022.812016.876

250.45 090.228 .670 Cap. 023.376017.333015.684 090.228 .670 Cap.015.684023.376017.333

254.11 090.663 .663 Cap. 023.688017.720015.720 090.663 .663 Cap.015.720023.688017.720

254.67 090.846 .663 Cap. 023.856017.838015.840 090.846 .663 Cap.015.840023.856017.838

255.02 091.170 .666 Cap. 023.688017.720015.828 091.170 .666 Cap.015.828023.688017.720

253.64 091.120 .666 Cap. 023.856017.655015.792 091.120 .666 Cap.015.792023.856017.655

253.40 091.713 .665 Cap. 023.820017.806015.876 091.713 .665 Cap.015.876023.820017.806

252.34 091.927 .667 Cap. 024.024017.747015.888 091.927 .667 Cap.015.888024.024017.747

251.83 092.291 .667 Cap. 023.868017.892016.032 092.291 .667 Cap.016.032023.868017.892

251.49 092.581 .667 Cap. 023.916017.768015.936 092.581 .667 Cap.015.936023.916017.768

252.94 093.057 .667 Cap. 024.276017.800015.972 093.057 .667 Cap.015.972024.276017.800

252.79 093.388 .667 Cap. 024.360018.079016.200 093.388 .667 Cap.016.200024.360018.079

252.65 093.781 .668 Cap. 024.324018.117016.284 093.781 .668 Cap.016.284024.324018.117

251.25 094.327 .669 Cap. 024.132018.068016.344 094.327 .669 Cap.016.344024.132018.068

246.84 094.655 .677 Cap. 022.812017.754016.428 094.655 .677 Cap.016.428022.812017.754

250.45 089.862 .680 Cap. 023.376017.693016.560 089.862 .680 Cap.016.560023.376017.693

254.11 090.228 .681 Cap. 023.688017.799015.348 090.228 .681 Cap.015.348023.688017.799

EHTINSULATION TESTERMains Operated

STEP VOLTAGE TESTING

High sensitivity with output stability

Safety Compliant to IEC : 61010EMC/EMI Compliant to IEC : 61326 - 1

POLARIZATION INDEX TESTING

High Charging Current

The EHT Insulation Testers are suitable for high voltage, heavy duty work. The

A.C. voltage may be generated either by battery or by a A.C. mains. Tests at

voltages between 2500 V and 5000 V or 10000 V may be selected as per the

selection of models available. A cross-coils ohmmeter is used to show the

insulation resistance readings directly in Megohms. The meter's deflecting circuit

is assisted by a CURRENT AMPLIFIER on its upper range, so that a high reading

on a wide scale can be achieved. The second rotary switch changes the

insulation resistance measuring range from inner low (Megohm I) scale to outer

high (Megohm II) scale.

The three terminals marked 'L', 'GUARD' and 'E' are mounted on a small panel

recessed in to the side of the case, if required the 'GUARD' terminal may be

connected to divert any leakage currents to the voltage source rather than

allowing them to pass through the ohmmeter, thus, eliminating their effects. Each

instrument is assembled in a Teak-wooden case with a laminated top panel and

chassis.

5000

4000

3000

2000

1000

2 510 20 50 100 200 500 1000 2000 50000 100000

v

(MW)

Terminal outputs plotted on log scale

Free AccessoriesMain lead 2m long.

One 8m Earth test lead with shrouded clips.

Operating manual.

One Screened 8m Line test lead with shrouded clips.

GENERAL

APPLICATIONS

*Specifications are subject to change without prior notice

The instrument covers a wide variety of insulation testing requirements and is

especially suited to work on energy network systems. The insulation tester is

ideal for high voltage, heavy duty work, for example, such applications as are

found in the maintenance or servicing of large industrial electrical installations,

generators, distribution networks, switchgear etc.

The instrument can also be employed to make measurements designed to show

the gradual decline that takes place in insulation when this is attacked

by corrosion, dirt, grease, moisture etc. during the operational life of a particular

installation. Such monitoring enables the Maintenance Engineer to anticipate

future performance and to plan ahead.

The instrument can be used to show the improvement in insulation within motor,

generator and transformer windings etc. that results from drying out procedures,

where these have become necessary because of excessive humidity or because of

operation in a moisture lade atmosphere. Regular STEP VOLTAGE TESTING, at

full rating or below when performed over similar time periods can indicate weakness

in insulation. Test voltage ratios of 1:2, 1:5, and 1:10 are possible with model MB

10XT. DIELECTRIC ABSORPTION TEST requires the voltage to be applied for

several minutes. The high sensitivity of the instrument enables sensible reading to

be obtained from such POLARIZATION INDEX TESTS.

The terminals voltage characteristics show how this instrument produce about 90%

of its rated maximum voltage at loads as heavy as 30 megohms.

Maintaining near rated test voltage at heavy load is essential in true insulation

testing and is a characteristic of this instrument.

SPECIFICATIONS

RIL/MK/C-06

RANGES

INSULATIONRANGE

VOLTAGEOUTPUT

d.c.

2500 V

5000 V

10,000 V

ORDINARYCODE

MB-10XT 0- 500

0- 1000

0- 2000

0- 50,000

0- 100,000

0- 200,000

Inner ScaleMegohms

Outer ScaleMegohms& inf.

MB-15XT 0- 100

0- 250

0- 500

Insulation Range(Gegaohms)

0- 1000

1000 V

2500 V

5000 V

10,000 V

15,000 V 0- 1500

Short CircuitTerminal Current

2.5m Ad.c. maxm.

Terminal Voltage (Setting at infinity)

_+3% of rated voltage

Accuracy +_0.76 mm (0.03 in)or as per BIS 11994-86

Power Source _+240V A.C. 10%

Dimensions 420X290X180mm

Weight 20kg (approx.)

AC Mains +_50 Hz 5%