INSULATION TESTER (MEGGERS) HAND DRIVEN GENERATOR TYPE
Tester is a compact, portable self-contained Instrument which is
used for direct reading of insulation resistance of electrical installations
and apparatus. The Insulation tester is composed of a hand driven
A.C. generator and a high sensitivity cross-coil Indicator.
CROSS COIL INDICATOR : The indicating movement is of the
cross coil ratio type and is designed so that voltage fluctuation,
caused by irregular cranking have no influence on the results of
INFINITY ADJUSTMENT : This has been provided in the Instrument.
SILENT GENERATOR : The AC Magnet hand generator drive is
extremely smooth and silent. There are no carbon brushes and commutators,
to be replaced as in DC generators.
QUICK RESPONSE : The quick response saves the time and extend
the life of the generator.
RESPONSE TIME : Less than 3 seconds, when a resistance,
the value of which corresponds to the central scale mark is suddenly
inserted between measuring terminals
LIMITS OF ERROR : The insulation resistance measurement is
accurate to within(+/-)5% of the indicated value over the effective
range and within (+/-)10% of the indicated value at the scale mark
for the rest of the ranges in confirmity with I.S.2992-1980
TOLERANCE OF VOLTAGE ACROSS MEASURING TERMINALS :Within (+/-)10%
of the rated voltage for scale mark of infinity and more than 90%
of the rated voltage for the central scale mark in confirmity with
ROTATIONS SPEED OF HANDLING : 160 R.P.M.
CENTRAL SCALE MARK : 1/50th of rated resistance value.
INSULATION RESISTANCE : More than 50 megaohms between the
electrical ciruits and the case, when measured by applying 500V
DI-ELECTRIC STRENGTH : Withstands 1 minute application of
2000 volts AC(rms) between the electrical circuits and the case
WEIGHT : Approximately 3Kg. For model Y1-M1 and Y1-M2
OPTIONAL ACCESSORIES :1 Carrying case 2. Test Leads.
DIMENSION : For Model Y1-M1 & Y1-M2 : 170X100X110mm (approx).
TRANSISTORISED PORTABLE INSULATION TESTER
These have been designed with a view of stronger and
rugged construction of individual components, which have been tested
by us for last so many years, and thus ensuring longer life of the
instrument. The size and weight of this model has been considerably
reduced with a view of making the instrument more handy. The indicating
Instrument is specially protected seperately in a moulded case to
prevent damages from dust at the time of servicing. The indicating
instrument has knife edge pointer and Anti-parallax mirror scale
for ensuring accurate readings. Single person operation push button
control, no troublesome cranks to turn, usage of standard 1.5 volts
pencil cells are all the special features.
ACCURACY : (+/-)5% of
WORKING PRINCIPLE :
A push pull oscillator is used to convert DC voltage to AC, which
is stepped up and further rectified to give the test voltage which
is DC. A sensitive movement is used to detect the change in current
due to insertion of resistance in the circuit.
INSTRUCTIONS FOR USE :
Set the Insulation tester horizontally, check the pointer to indicate
infinity (°C) by the mechanical adjuster screw, below the meter
window. Now connect the apparatus to be tested across the line &
Earth terminal. Press the push button and read the value of the
insulation resistance indicated by the deflection of the pointer.
The scale is calibrated directly in megaohms.
or 20 Megaohms
or 50 Megaohms
or 500 Megaohms
RANGES MADE TO ORDER