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Advanced Technocracy Inc.
Ambala, Haryana
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Meter Bridge and Various Type of Bridges

Our product range includes a wide range of Meter Bridge and Various Type of Bridges such as Meter Bridge or Wheatstone Bridge with Pencil Jockey, Meter Bridge or Wheatstone Bridge with Spring Type Jockey, Spare Pencil Jockey, Spare Lead, Fixed Voltage Stabilized Power Supply, Dial Type Resistance Box (Two Dial Economy Model) and many more items.


Meter Bridge or Wheatstone Bridge with Pencil Jockey

The four-gap bridge has a large and heavy copper strip of  mounted on a heavy 3/4” thick laminated base of size 45” x 4” x 3/4”. Nine heavy Brass terminals lock type are provided to reduce the resistance to a minimum. The ends gaps are closed by removable Copper Binding pieces which are held in position by the terminals. The 24 SWG constantan wire is stretched along the top of wooden meter scale and securely clamped to the Brass end strips so that end errors are negligible.Supplied complete with pencil jockey along with lead for connections. Includes detail working manual. Overall dimensions: 1.12m × 100mm × 50mm, including terminals.

Spare Pencil Jockey

Ideal for Wheatstone Bridge and all types of Potentiometers, bakelite moulded handle, brass plated contact and with a locating notch. A heavy lock type brass plated terminal is provided for connection with Lead. The shape of the jockey is large (different from the one available in the market) and easy to handle. Supplied without lead.

Spare Lead

To connect pencil jockey with potentiometer and Wheatstone Bridge, a heavy wire lead of length 1.5 meter with U-shape brass clips connected at both the ends of the wire is provided.

Fixed Voltage Stabilized Power Supply

2V, 200mA, Fixed Voltage stabilized power supply. Excellent quality for all types of Meter Bridge experiments. Supplied with leads.

Dial Type Resistance Box (Two Dial Economy Model)

This type of Decade Resistance Box is particularly good for use with Wheatstone Bridges. It consists of high stability . Carbon metal film resistance of 1 Watt having accuracy of + 1%.

Size
a- 0.1x10 , 1 x10 ohms
b- 1x10, 10x10 ohms
c- 10x10, 100x10 ohms 

Temperature Co-efficient Resistance Coil

For determining temperature co-efficient resistance of copper, comprising a coil of fine enameled copper wire of about 7-10 ohms resistance, wound non-conductively on an insulating frame and connected to thick copper wire fitted with terminals. The coil is enclosed in a glass tube of borosilicate glass to contain paraffin oil. The rubber stopper is drilled for a thermometer. Tube size approx. 100mm x25mm dia

Portable Wheatstone Bridge

This Bridge is fully portable with a built in sensitive Galvanometer and a dry battery.

Series Arm:There are 4 decades of 10×1, 10×10, 10×100 and 10×1000 ohms

Range Multipliers:A single rotary switch furnishes 7 range multipliers of X1000, X100, X10, X1, X0.1, X0.01 and X0.001.

Range of measurement :0.001 ohm & 11.1 mega ohm. 

Battery:A built-in dry battery of 4.5 volts. There is a provision for using external battery for measuring high resistances.

Galvanometer:Galvanometer of Model MO 65 with sensitivity 10 microamperes/ div. is used.

Push Buttons:Two push buttons for battery and galvanometer are provided.

Accuracy:Both series and ratio coils are adjusted to an accuracy of better than 0.05%. Overall Accuracy of measurements is better than ±0.1%.

Description
a- Constantan Coil Accuracy ±0.1%.
b- Manganin Coil Accuracy ±0.02%. 

Portable Wheatstone Bridge (Economical Model)

Specification of this Portable Wheatstone Bridge is equivalent to except resistance dials are made of 1% metal film, carbon resistance instead of Constantan or Manganin Coil. Rest all the features like series arm (4 decades), range multipliers (7 ranges), Battery, Push Buttons & Galvanometers .

Accuracy : 1.25%

Kohlrausch Conductivity Bridge

• A circular slide wire is calibrated from 0.01 to 10 ohms A rotary dial furnishes six multipliers of 0.1, 1, 10, 100 & 1000 & 10000. 
• Range of measurement is 0.01 to 100 K Ohm 
• Terminals for supply and head phone/detectors are provided on the panel. A detector key is also provided. The position of slider is adjusted to the position of minimum sound or position of minimum A.C. signals. 
• Accuracy of coils ±0.1% 
• Accuracy of measurement ±1% at mid scale & ±2% overall.

Induction Coil

For use with Kohlrausch Conducting Bridge.


Hamburger Coil (Conductivity Coil)

Hamburger Coil with platinum electrode for use with Kohlrausch Conductivity bridge, Dip Type

Rayleigh Self Inductance Bridge

The ratio arm is in two dials of 1, 10, 100 and 1000 ohm each. The resistance arm is in three dials having decade of 0.1, 1 and 10. A slide having 0.17ohm resistance is connected in series with unknown L. The slide wire is calibrated into 170 equal parts for easy calculation. A special double key is fitted to bridge. The key is internally connected with terminal for connecting battery and Galvanometer. The bridge can also be used as an Wheatstone bridge.

Industrial Kelvin Double Bridge

Standard Resistance : There are 10 coils of .01 ohm each arranged on a rotary dial plus a circular slide wire of total resistance .01 ohm and 500 sub-divisions is equal to .00002ohms on the normal range.

Multiplying Ratios: A single rotary switch furnishes 5 multiplying ratios of x100, x10, ×1, ×.01 and 0.1. 

Range of Measurement :The bridge has a range of 2 micro ohm to 11 ohm. 

Panel :A bakelite panel enclosed in a teak wood box is used. Separate current and potential terminals, battery and galvanometer terminals, push buttons for battery and galvanometer are provided on the panel. 

Max. Current :10A intermittently & 5 A continuously.

Accuracy :±0.5% current 5 Amps upto 10Amps

Coils :Managanin Coils are used. This bridge is very suitable for the use of wires & cable manufacturers. It is being extensively used for finding the resitance of transformer winding, contact resistance of relays etc.

Adjustable Heavy Duty D.C. Current Source

The unit is mains operated and can deliver a continuously adjustable D.C. Current of 0-10 Amp maximum. The unit consist of a variac, a step down transformer, a bridge rectifier, filter circuit and an ammeter of 0-10A to read current. Two heavy brass terminals are provided for output.

Input Voltage: 230volts A.C. Mains 50c/s

D.C. Output :Approximate 0-10V, Continuously adjusted to give a variable current of 0-10Amp depending upon external load.

Conductivity Attachment

It is an arrangement to hold specimens in the form of wires, rods strip etc. Separate current & potential terminals are provided. Distance between potential point is 50cm. It can hold specimen of any size between ½” dia rod to 42 S.W.G. Wire

Portable Kelvin Double Bridge

Potable Kelvin Bridge is used to measure the unknown value of resistance. It can measure from 0.00001O to 110O

The instrument has following inbuilt parts :-

Ratio Dial :The instrument consist of one Ratio dial having multiplying range of 100, 10, 1 & 0.01.

Main Dial:The instrument consist of a Resistance dial having a table resistance of 1W divided into 10 equal step of 0.1O

Circular Scale :A circular scale in series with main dial is provided on the panel. Having a table Resistance of 0.1 ohm divided into 100 equal steps of 0.001W

Galvanometer :Inbuilt galvanometer is fitted with in the instrument Terminal g1 & g2 are provided for connecting external Galvanometer-A selector switch is provided to select either inbuilt or external Galvanometer.

Press key :A double point press key is provided within the panel to bring galvanometer & battery into the circuit

Terminals :Four terminals C1, P1, C2, P2 are provided for connecting to four terminals unknown resistance coil, where C1, C2 are current terminal P1, P2 are potential terminals. C1, P1 is one pair of terminal and C2, P2 is another pair of terminal

Special Water Bath

Hot (water, mustard oil or Silicon oil) is essential to most electrical & electronic Instruments . Supplied with 100 ml Borosilicate Glass Beaker to place in Brass Reservoir in the special water bath. Whenever hot water or oil is required that can be heated by pouring water or oil in the said beaker. Very useful for so many experiments in the electrical sections.

Thermocouple Copper Constantan

Copper Constantan mounted on a superior quality bakelite strip. With two terminals & mounted on stand.


Callender & Griffith's Bridge

Three in one - Carry's Foster Bridge, Potentiometer & Callender & Griffith’s Bridge. It is an improvement over the potentiometer. The 50cm long slide wire of 1ohm resistance is calibrated into 100 equal parts. 14 coils are arranged in series in dials from each being of 1 ohm resistance terminals arranged for appropriate working of different instruments. Jockey slides on brass rod.

Platinum Resistance Thermometer

This thermometer comprises a length of fine platinum wire of about 2.8 ohms resistance wound non inductively on a mica frame & soldered to stout copper leads. A pair of compensating leads are provided. All four leads being connected to terminals mounted on a suitably engraved insulating panel,which is joined to the mica resistance frame by cork mount on to which is fitted a stainless tube. Since connections are soft soldered, this resistance thermometer is suitable for temperature work. Packed in velvet lined case.

Anderson Bridge for Self Inductance

Anderson Bridge is used to measure unknown value of Inductance. The instrument has following inbuilt parts fitted in a Teak Wood case.

AC Source :The Bridge consist of sine wave signal of 1KHZ. The Amplitude of AC switch indicating lamp is provided on the bakelite board. Two sockets are provided for the output of AC signals.

Detector :For detecting small AC signals in the output, Null Detector is in-built with digital display.

Circuit Diagram :The circuit layout on the board is quite spread out to facilitate convenient working & clear understanding. 4mm socket are provided for making connections.

Unknown Value: Four unknown values are supplied with instrument.
R1 :Three decade dial of x1, x10 and x100 ohms.

M :Three decade dial of x10, x100 and x1000 ohm

C :Decade dial of x 0.01 mfd.

R2 R3 R4 :Fixed 1Kohm.

De-Sautys Bridge

This bridge is used to measure the unknown value of capacitance. The instrument has following in built parts fitted in teak wood case. 

AC Source :The Bridge consist of sine wave signal of 1KHZ. The Amplitude of AC switch indicating lamp is provided on the bakelite board. Two sockets are provided for the output of AC signals.

Detector :For detecting small AC signals in the output, Null Detector is in-built with digital display.

Unknown value :Five unknown values are provided on the board selected by a Rotary switch.

Circuit Diagram :The circuit layout on the board is quite spread out to facilitate convenient working & clear understanding. 4mm socket are provided for making connection. 

R1, R2 :Two decade dial of x10 & x100 ohms.

R1, R2 :Decade dial of x0.1mfd.

Weins Series Resistance Bridge

The Wein’s bridge is used to measure the unknown value of capacity.

AC Source:The Bridge consist of sine wave signal of 1KHZ. The Amplitude of AC switch indicating lamp is provided on the bakelite board. Two sockets are provided for the output of AC signals.

Detector:For detecting small AC signals in the output, Null Detector is in-built with digital display (optional - sometime Digital null detector is replaced by small speaker).

Circuit Diagram :The circuit layout on the board is quite spread out to facilitate convenient working & clear understanding. 4mm socket are provided for making connection.

Unknown value :Five unknown values are provided on the panel selected by a Rotary Switch. 

R2 :Two decade dial of x10, and x 100 are provided on the panel.

R1, R3 and R4 :Decade dial of x100 is provided on the panel.

Weins Bridge Frequency Measurement

This bridge has been designed to calculate the unknown value of frequency of Bridge Oscillator.

Detector:For detecting small AC signals in the output, Null Detector is in-built with digital display (optional - sometime Digital null detector is replaced by small speaker).

Circuit Diagram:The circuit layout on the board is quite spread out to facilitate convenient working & clear understanding. 4mm socket are provided for making connection.

C1, C2 :Decade dial of 0.1mfd.

R3 :Ratio Dial of 1, 10, 100 & 1000

R4 :Ratio Dial of 2, 20, 200 & 2000

R1 R2 :Are mechanically coupled x10, x100, x1000 ohms.

Maxwells Inductance Bridge

Maxwell’s Bridge is used to measure the unknown value of Inductance. The instrument has following inbuilt parts fitted in teak wood case.

AC Source :The Bridge consist of sine wave signal of 1KHZ. The Amplitude of AC switch indicating lamp is provided on the bakelite board. Two sockets are provided for the output of AC signals.

Detector :For detecting small AC signals in the output, Null Detector is in-built with digital display

Circuit Diagram :The circuit layout on the board is quite spread out to facilitate convenient working & clear understanding. 4mm socket are provided for making connections

Unknown Value :Four unknown values are supplied with instrument.

R4, R3 :Two Decade dial of x10 and x100 ohms.

L2 :Decade dial of x10 mH

R2 :Decade dial of x1 ohm.

Maxwells Inductance Capacitance Bridge

By this Bridge the inductance is measured in terms of Standard Capacitance. The instrument has following parts :

AC Source:The Bridge consist of sine wave signal of 1KHZ. The Amplitude of AC switch indicating lamp is provided on the bakelite board. Two sockets are provided for the output of AC signals.

Detector :For detecting small AC signals in the output, Null Detector is in-built with digital display.

Circuit Diagram :The circuit layout on the board is quite spread out to facilitate convenient working & clear understanding. 4mm socket are provided for making connections.

Unknown Value :Four unknown value are supplied with instrument.
R2, R3 :Fixed 1K ohms.
R1 :Decade dial of x1, x10, x100 ohms.
R4 :Decade dial of x10, x100, x1000 ohms.
C4 :Decade dial of x0.01 mfd.

Owens Bridge

Owen’s Bridge is used to measure the Unknown value of Inductance. The instrument has following inbuilt parts fitted in a Teak Wood Case.

AC Source :The Bridge consist of sine wave signal of 1KHZ. The Amplitude of AC switch indicating lamp is provided on the bakelite board. Two sockets are provided for the output of AC signals.

Detector :For detecting small AC signals in the output, Null Detector is in-built with digital display

Circuit Diagram :The circuit layout on the board is quite spread out to facilitate convenient working & clear understanding. 4mm socket are provided for making connections.

R3 :Decade dial of X10, x100 and x1000 ohms.
C3, C4 :Decade dial of x0.1 mfd.
R2 :Decade dial of x100 ohms.
R1 :Internally fixed 1000 ohms.

Hays Bridge

Hay’s bridge is used to measure the unknown value of Inductance. The instrument has following inbuilt parts fitted in a Teak wood case.

AC Source:The Bridge consist of sine wave signal of 1KHZ. The Amplitude of AC switch indicating lamp is provided on the bakelite board. Two sockets are provided for the output of AC signals.

Detector:For detecting small AC signals in the output, Null Detector is in-built with digital display

Circuit Diagram:The circuit layout on the board is quite spread out to facilitate convenient working & clear understanding. 4mm socket are provided for making connections.

Unknown Value:4 unknown value are supplied with instrument.

R2,R3:Three decade dial of x10, x100 and x1000 ohms

C:Decade dial of x0.1mfd.

R4:Fixed resistance of 100 ohms

Schering Bridge

Schering Bridge is used to measure the unknown value of Capacitance. The instrument has following inbuilt parts fitted in Teak Wood Case.

AC Source:The Bridge consist of sine wave signal of 1KHZ. The Amplitude of AC switch indicating lamp is provided on the bakelite board. Two sockets are provided for the output of AC signals.

Detector:For detecting small AC signals in the output, Null Detector is in-built with digital display

Circuit Diagram:The circuit layout on the board is quite spread out to facilitate convenient working & clear understanding. 4mm socket are provided for making connections.

Unknown Value:Five unknown value are provided on the board selected by a Rotary switch.

R1 R2 :Ratio Dial having step of 1, 10, 100 and 1000 Ohms.

r:Decade dial of x1 ohms.

C1Two Decade dial of x0.001 mfd & x0.01mfd.

C2Internally fixed of value 0.001mfd.


Bridge Oscillator (Solid State)

Using operational amplifier, Wein Bridge oscillator for better stability. It provides pure sine wave 0-10 volt R.M.S. continuously variable output, giving fixed frequency 1KHz. This bridge oscillator is used in almost all the four arm bridges.

Null Detector

The Null Detector comprises a solid state amplifier having output stage with meter Indication. The instrument is supplied in metal cabinet with Duco Paint & Aluminium front panel. The said detector has been designed for use with AC Bridges (replaceable of headphone).

Fixed Condenser Boxes

High quality silver mica, paper polyester and metal film condenser are mounted on the Plastic plate fitted in a steel turf Non ABS Plastic. Two 4 mm socket terminals are provided. Working voltage 250 V for 0.01 mfd to 2 mfd capacitors and we use paper polyester capacitors upto this range. Working voltage 350 V for 5 mfd to 40 mfd capacitors and we use electrolytic capacitors up to this range.

Ranges
A- 0.01to 0.1 mfd (any one range)
B- 0.2, to 0.5 mfd (any one range)
C- 1 mfd
D- 2 mfd
E- 5 mfd
F- 10 mfd
G- 20 mfd
H- 40 mfd
I- 60 mfd
 

Four Dial Condenser Box

Ranges

10×0.001, 10×0.01, 10×0.1, 10×1 mfd 

Dielectric Constant Apparatus (Solid & Liquid)

It consists of following parts. 

• RF Generator (9-10MHz Approx.)
• Micro Ammeter ( Range 0-50mA) 
• Potentiometer for sensitivity selection 
• Fixed Capacity (Metal) 
• Variable Gang Capacitor 
• Socket for test capacitor & variable Capacitor brought out at front panel 
• One solid bakelite plate to be insert in gap of test capacitors.

Fixed Inductance Boxes

The air cored inductance coils are fitted in a steel turf bakelite case, elegantly finished. The frequency response is 1000 cycles/sec. Accuracy ±2.5%..

Ranges:

a- 100 micro Henry to 1000 micro Henry
b- 1milli Henry to 1000 milli Henry
c- 1000 milli Henry to 1500 milli Henry 

Single Dial Inductance Box

Ranges
a- 100 micro Henry to 1000 micro Henry
b- 1 milli Henry to 10 milli Henry
c- 10 milli Henry to 100 milli Henry
d- 100 milli Henry to 1000 milli Henry
e- 1 Henry to 10 Henry
 

Two Dial Inductance Box

Ranges
a- 100 Micro Henry to 10 milli Henry
b- 1 milli Henry to 100 mill Henry
c- 1 milli Henry to 100 mill Henry
d-  100 milli Henry to 10 Henry

Three Dial Inductance Box

Ranges
a- 100 Micro Henry to 100 milli Henry
b- 1 milli Henry to 1000 milli Henry
c-  10 milli Henry to 100 Henry

Four Dial Inductance Box

Ranges
a- 100 Micro Henry to 1Henry
b-  1 milli Henry to 10 Henry

Head Phone

Flexible type, with high resistance receivers, fully adjustable according to head-size.


Meter Bridge or Wheatstone Bridge with Spring Type Jockey

Pencil Jockey is replaced by superior quality spring type Brass Sliding Jockey, which moves on a metal rod. The brass strips are fitted on a laminated board of size 45”×5”×3/4”. Includes detail working manual.

Portable Wheatstone Bridge (Modified)

• This bridge is exactly except for additional facility of Murray and Varley loop test for location of faults in cables. The bridge is also suitable for resistance measurements.
• For resistance measurements and varley loop test, there are 7 multiplying factors of ×1000, ×100, ×10, x1, ×0.1, ×0.01 and 0.001.
• For Murray loop tests, 3 additional multiplying factors of 10M, 100M and 1000M are provided. 
• Special switching arrangement has been provided to carry out conductance tests, Varley loop test and Murray loop test.
• Rest of the features like series arm, battery, galvanometer, push buttons .

Description
a- Constantan Coil Accuracy ±0.1%.
b- Manganin Coil Accuracy ±0.02% 

Callender & Griffith's Bridge (New Type)

The instrument consist of following parts fitted in a teak wood case. 

Rotary Dial :A Rotary Dial of x1r is provided on the panel having a total Res. of 10r. 

Circular Scale:A slide wire Arrangement of 1r ohm is provided on the panel having a scale with center zero divide int 100 equal parts.

Four Terminal:Two pairs Terminal C1 and P1 are Provided on the panel for connecting. C1 & P1 Terminal of Platinum Res. Thermometer. 

Two Pair of Terminal:one for Battery and one for galvanometer is provided on the panel.

One Press Key:is provided to bring Battery into circuit. 

Single Dial Condenser Box

Ranges
a- 10×0.001 mfd
b- 10×0.01 mfd
c- 10×0.1 mfd
d- 10×1 mfd 

Two Dial Condenser Box

Ranges
a- 10×0.001 & 10×0.01 mfd
b- 10×0.01 & 10×0.1 mfd
c- 10×0.1 & 10×1 mfd 

Three Dial Condenser Box

Ranges
a- 10×0.001, 10×0.01 & 10 ×0.1 mfd
b- 10×0.01 , 10×0.1 & 10×1 mfd 

Bridge Oscillator (3 Frequencies)

This Bridge Oscillator is used to find unknown frequency or in 4 arm bridges, having three frequencies of 400Hz, 1KHz & 3 Khz.


Advanced Technocracy Inc.

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