Advanced Technocracy Inc.
Grain Market, Ambala, Haryana
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Resistance, P.O Boxes, Potentiometer

Our range of products include resistance box plug type (constantan coil), resistance box plug type (manganin coil), resistance box : dial type (constantan & manganin), resistance substitution box, economical resistance box : dial type and post office box - 6 dials (manganin coil).

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Precision quality consisting of 12mm (approx. 1/2”) thick rectangular brass block, non inductive, double covered Eureka Constantan wire is wound on bakelite spool, enclosed in a teak wood box. Accuracy ±0.1%.

 
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Consisting of 12mm (approx. 1/2”) thick rectangular brass block, resistance coils are made from doubled silk covered Manganin wire. Accuracy ±0.05%.
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General :Decade Resistance Boxes incorporate the latest design switches so as to ensure low contact resistance. The moving contacts are constructed from phosphor-bronze lamination to ensure long life and repeatability of results. Eleven position switches are employed.

Panel :An insulating panel of bakelite enclosed in an elegantly polished teak wood box.

Resistance Coil:Resistance Coils are non-inductively wound, properly varnished and aged for permanence of values over a long period. Imported double silk covered manganin or constantan wire is used in Grade A and Grade B resistance boxes separately. Manganin has a negligible temperature coefficient against copper.

Accuracy :Accuracy is brought within the field ±0.05% to ±0.1% for constantan coils (B Grade) and ± 0.02% to ±0.05% for manganin coils (A Grade)

Contact Resistance :Contact Resistance per decade is of the order of 0.0015 ohm.
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Comprising 12 radio type resistances using standard preferred values covering the range 100 ohms to 470 kilo-ohms. In the steps ratio of 1:2 approx. Selection is by means of rotary switch & external connection is via 4mm socket.

Resistance Tolerance
100 ohms ±10%
220 ohms ±10%
470 ohms ±10%
1Kilo-ohms ±10%
2.2 Kilo-ohms ±10%
4.7 Kilo-ohms ±10%
10 Kilo-ohms ±10%
22 Kilo-ohms ±10%
47 Kilo-ohms ±10%
100 Kilo-ohms ±10%
220 Kilo-ohms ±10%
470 Kilo-ohms ±10%


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Theses unit employs high stability metal film resistance element having superior characteristics to traditional wire wound coils. It's equally suitable for AC or DC use. The individual decade are series connected in two dials, Three dials & four dials. We use high stability 1% carbon metal film resistance.

Type
Single dial 0.1x10, or 1x10 or 10x10 or 100x10 (choice of any single range)

Two dial 0.1x10, 1x10 or 1x10, 10x10 or 10x10, 100x10 or 100x10, 1000x10 ohms (choice of any one single range)

Three dial 0.1x10, 1x10, 10x10 or 1x10 10x10 100x10 or 10x10, 100x10, 1000x10 (choice of any one single range)

Four Dial 0.1x10, 1x10, 10x10, 100x10 or 1x10, 10x10, 100x10, 1000x10 (choice of any single range) 
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With 6-decades, four series dials for resistance 1, 10, 100 & 1000 ohms and 2-ratio dials. Two terminals are provided for using the series dials as on ordinary dial type resistance box. The galvanometer and battery key are fitted with contacts. Range of measurement is 0.001ohms to 1, 11, 10000ohms. Coils are non-inductively wound with manganin wire. Accuracy + 0.2% to 0.05% A grade.
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Please add extra for sensitive Galvanometer having sensitivity of 20mA per division in the above P.O. Box.



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Design for use Standard , Stable, Voltage Reference Source in applications such as standardization of Potentiometers, Instruments, calibrations, temperature & Voltage measurements & pH testing etc. Housed in a small steel cabinet giving e.m.f of 1.0816 volts 0 accurate between 10 C to 40 C temperature.
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Consisting of 12mm thick rectangular brass block, coils are wound with constantan coil having Accuracy with +0.1%. Other specifications are same as Standard Cell (Electronic Version).
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Comprising four constantan wires of 24 SWG, one meter long, clamped under heavy Brass strips of SWG 18 and fitted by screws in such a manner so that it is easily replaceable and has negligible ‘END ERRORS’. Each block is fitted with a heavy lock type brass terminal which is mounted on an 18mm thick ply wooden board with mica on top. The four wires are stretched along the both ends of two full meter scales. Overall dimension: 1.12m x 100mm x 50mm high including terminals. Supplied complete with Pencil Jockey along with lead for connections & detailed working manual.
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Pencil Jockey is replaced by spring type brass sliding jockey. This Potentiometer is also provided with pulley arrangement system to tight the wires. The jockey moulded from brass alloy, sliding over the metallic rod provides maximum smooth movement. The jockey consist of four single sharp pencil springs loaded contacts are given separately. An overlapping Perspex pointer helps in reading the raised scale.
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Pencil Jockey is replaced by spring type brass sliding jockey. This Potentiometer is also provided with pulley arrangement system to tight the wires. The jockey moulded from brass alloy, sliding over the metallic rod provides maximum smooth movement. The jockey consist of four single sharp pencil springs loaded contacts are given separately. An overlapping Perspex pointer helps in reading the raised scale.
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Mounted on a polished 18mm thick ply wooden board with teak wood colour sunmica on top, with 10 wires of SWG 24 connected in series, clamped under heavy Brass strips of SWG 18 and fitted by screws in such a manner so that it is easily replaceable and has negligible . Overall dimension: 1.15mm × 175mm × 50mm high including terminals. Supplied with pencil jockey along with lead for connections & detailed working manual.
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Comprising a 0.56 mm constantan wire stretched along a meter scale subdivided into millimeters and centimeters, clamped to stout, plated brass end plates. the terminating strips are provided with heavy duty brass terminals & the whole is mounted on 18mm laminated board. Supplied with pencil jockey & lead.
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Specially designed for all potentiometer experiments. Variable from 0-5 V at 1A, Solid state regulated power supply. Supplied with leads.
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This compact and inexpensive potentiometer is ideal for introducing students to the method and techniques of e.m.f. measurement. The design is simple and accurate measurements can be done with it. There are either 10 or 14 or 22 coils arranged on a rotary dial plus a linear slide wire 50cm long and subdivided into 500 equal parts. Terminals for battery, galvanometer and test circuits are provided on the panel. A thick knife edge jockey is provided to make contact on the slide wire.

Description
a. Potentiometer Dial Pattern with 10 coils.
b. Potentiometer Dial Pattern with 14 coils.
c. Potentiometer Dial Pattern with 22 coils. 
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• Each Slide wire division is equal to 1/2 millivolt or 500 microvolts. 
• Coarse and fine rheostats are provided. Terminals for 2 volts battery, Galvanometer , standard cell are provided on the panel. 
• Current is of the order of 125 m A. This potentiometer is supplied with a self standardization circuit built in, which renders standardization dependent on setting of voltage dials
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For extending the range of crompton Potentiometer, provided with a number of tapping points giving multiples of 1.5V.

Ranges : 1.5, 15, 30, 150, 300, 750 V.
Resistance : 37,500 ohms.
Accuracy : +0.02%
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Ranges : 1.5, 15, 30, 150, 300 V. Resistance : 15,000 ohms. Accuracy : +0.02%
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This unit consist of falling parts:-

• 1 DPM is for Voltmeter measurement (V) nd 
• 2 DPM is current measurement (A ) 1 rd 
• 3 DPM for Galvanometer purpose(G) 
• In built power supplies, 0-12V DC/1A. 
• In Built standard cell.
• Circuit Diagram on the Front Panel with input & Output sockets.
• A Bunch of connecting leads 

This compact Electronic Unit is very useful for standardisation of DC Potentiometer, Calibration of Voltmeter & Ammeter using DC Potentiometer.
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Advanced Technocracy Inc.

Kunal Chopra (CEO)
ATICO House, 5309 Grain Market, Near B. D. Senior Secondary School Aticoindia@gmail.com
Ambala - 133001
Haryana, India
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