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Milli Volt Meters, Analogue Type

"INDOTECH" VOLTMETERS & AMMETERS :

GENERAL :

CONSTRUCTION :

‘‘INDOTECH’’ Voltmeters and Ammeters have been found indespensible by Laboratories and Industrial Houses. All the components used in the manufacture of the instruments are selective and are designed to ensure long term accuracy and service. All parts/sub-assemblies are throughly inspected and gauged at all stages with utmost care by experts.

TYPE OF METERS :

MOVING IRON TYPE METERS :

The movements are strongly constructed incorporating synthetic saphire jewel bearings, hard chrome plated highly polished pivots and phosphor-bronze cadmium copper hair springs. Moving coil meters are fitted with high flux density magnets resulting in linear scale. All these meters have zero adjuster accessible from the front.

MOVING COIL TYPE METERS :

These are meant for measuring AC quantities. However, DC quantites could also be measured but with slightly low accuracy. These are available in 90O movement.

MOVING COIL RECTIFIER TYPE METERS :

Moving Coil instruments are meant for the measurement of DC voltages and currents. All the meters are fitted with high flux density magnets resulting in linear scale. These are available in both 900&2400 movements.

TESTS :

Following tests are performed as per BIS 1248-03

1. VIBRATION TEST :

   The meters are subjected to vibrations. This test ensures that if there is any loose component, it
   will be detected before the meter is passed.

2. LIFE TEST :

   The meter is subjected from zero to full scale and the counter meter records the number of operations.

3. OVER LOAD TEST :


   The meter is over loaded 120% of its rated capacity for 2 hours.

4. HIGH VOLTAGE BREAKDOWN TEST :

   The meter should withstand 2kV, AC, if applied between electrical circuit and any metallic point of the meter for 1 minute.

5. INSULATION RESISTANCE TEST :

    BIS1248-03 specifies that the insulation resistance should be above 5 megohms. The test is performed accordingly.

6. ACCURACY TEST :

   The accuracy test is performed as per BIS 1248-03. The error is calculated on the basis of full scale deflection of the meter.

PARAMETERS AVAILABLE :

   Meters are available for the measurement of mV, V, mA & A, KV meters are calibrated in terms of PT ratio & high range            ammeters in terms of CT ratio.

NOTE :

1. Mode l s SR72/MR72, SR96/MR96 & SR144/MR144 have changeable dial for different CT Ratios in case of Moving Iron         Meters and different FSD for Shunt opreated meters in case of Moving Coil Meters of 90' movements.

2. Dials for 2400 movement meters are not changeable.
 
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