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Maxwell’s Inductance Bridge ‘PSAW’ (1022 A)

We can also measure self inductance with the help of this bridge.

P=	R3 =	consists of standard decade dial of 3 dials - 10 x 10, 100 x 10 & 1000 x 10 ohms.
Q =	R4 =	consists of standard decade dial of 3 dials - 10 x 10, 100 x 10 & 1000 x 10 ohms.
	R2 =	consists of standard decade dial of 3 dials - 0.01 x 10, 0.1 x 10 & 1 x 10 ohms.
	L1 =	single dial inductance box (10 mH to 100 mH) is to be connected from outside.
	R2 =	is connected in series with L1 to form third arm denoted as R.
	L2 =	unknown inductance whose value is to be calculated is connected in the fourth arm S. Schering Bridge
P =	R1 =	consists of ratio dial 1, 10, 100 & 1000 ohms.
	R2 =	consists of ratio dial of 1, 10, 100 & 1000 ohms.
	C2 =	Gang capacitor of 500 pf.
	Q =	In this arm C2 is placed in parallel with R2 to form second arm cd.
R =	C3 =	consists of three dial condenser box of 0.001 x 10, 0.01 x 10 & 0.1 x 10 mfd.
	r =	consists of three dial resistance box of 1 x 10, 10 x 10, 100 x 10 ohms.

Unknown capacitor C1 whose value is to be calculated is connected in series with r to form fourth arm S. Terminals for the connection of headphone, unknown capacitor and oscillator are also provided on the panel.

Supplied without headphone and oscillator.

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Maxwell’s Inductance Capacitance Bridge ‘PSAW’ (1022)

Terminals for the connection of oscillator, unknown inductance & headphone are provided on the bakelite panel.

R1 = 1st arm consists of ratio dial of 10, 100 & 1000 ohms (denoted as P).

The 2nd arm Q consists of ratio dial of 10, 100, 1000 ohms (denoted as R4) shunted by standard capacitance of 3 decade dial of 0.01 x 10, 0.1 x 10 and 1 x 10 mfd.

The 3rd arm R2 consists of a non-inductive resistance of 3 decade dial of 10 x 10, 100 x 10 & 1000 x 10 ohms (denoted as R)

The 4th arm (S) consists of unknown inductance L1 (whose value is to be calculated) in series with a variable non-inductive resistance R1 of 3 decades of 0.01 x 10, 0.1 x 10 & 1 x 10 ohm.

Supplied w/o headphone and oscillator.

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Bridge Platinum Resistance ‘PSAW’ (1023)

A	Range 0-500 °C
B	– do---- Platinum Resistance Thermometer

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Rayleigh Self Inductance Bridge ‘PSAW’ (1024)

The ratio arm is in two dials of 1, 10, 100 and 1000 ohm each. The rheostat arm is in three dials having decade of 0.1, 1 and 10. A slide having 0.17 ohm 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.

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Owen’s Bridge ‘PSAW’ (1027 C)

P =	R1 = consists of ratio dial 1, 10, 100 & 1000 ohms.
	R2 = consists of ratio dial of 1, 10, 100 & 1000 ohms.
	C2 = Gang capacitor of 500 pf.
	Q = In this arm C2 is placed in parallel with R2 to form second arm cd.
R =	C3 = consists of three dial condenser box of 0.001 x 10, 0.01 x 10 & 0.1 x 10 mfd.
	r = consists of three dial resistance box of 1 x 10, 10 x 10, 100 x 10 ohms.

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Student Kelvin Bridge ‘PSAW’ (1026 )

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Hay’s Bridge ‘PSAW’ (1027 B)

This bridge is modification of Maxwell’s bridge.

P =	Q = consists of ratio dial of 1, 10, 100 & 1000 ohms. Unknown inductance L is connected in series with Q to form 2nd arm.
	S = consists of 3 dial resistance box of 10 x 10, 100 x 10 & 1000 x 10 ohms
	R1 = consists of 3 dial resistance box 10 x 10, 100 x 10 & 1000 x 10 ohms.
	C = consists of 3 dial condenser box of 0.01 x 10, 0.1 x 10, 1 x 10 mfd.
	R1 = is connected in series with C to form fourth arm.

Three pair of terminals are provided for the connection of headphone, oscillator & unknown inductance L.
Supplied with headphone & oscillator.

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Wein’s Series Resistance Capacitance Bridge ‘PSAW’ (1027 A)

The bridge has got the following main features :

R1 = consists of ratio dial of 1, 10, 100 & 1000 ohms.

R2 = consists of ratio dial of 1, 10, 100 & 1000 ohms.

r1 = consists of 3 dial resistance box of 1 x 10, 10 x 10 & 100 x 10 ohms.

r2 = consists of 3 dial resistance box of 1 x 10, 10 x 10 & 100 x 10 ohms.

C2 = consists os single dial capacitance box 0.1 x 10 mfd.

C1 = unknown condenser whose value is to be calculated.

r1 = is connected in series with C1 to form 3 rd arm ad.

r2 = is connected in series with C2 to form 4th arm ab.

Terminals for the connection of head phone, unknown condenser and bridge oscillator are provided on the panel.

Supplied without head phone and oscillator.

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Wein’s Bridge Frequency Measurement ‘PSAW’ (1027)

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

R3 = R4 = consists of two ratio dials of 1, 10, 100 & 1000 ohms on the panel.

C1 = consists of capacitance box of two dial of 0.01 x 10 and 0.1 x 10 mfd.

R1 = consists of standard decade dial of 3 dials 10 x 10, 100 x & 1000 x 10 ohms.

C1 = is connected in parallel with R1 to form arm S.

R2 = consists of standard decade dial of 3 dials 1 x 10, 10 x 10 & 100 x 10 ohms.

C2 = is connected in series with R to form arm R. Three pairs of terminals are provided for headphone, bridge oscillator & two dial condenser box. Supplied without headphone, bridge oscillator & without two dial condenser box.

(C2 = Two dial condenser box is not supplied with this unit.)

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Potentiometer dial pattern ‘PSAW’ (1029 )

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 10 coils arranged on a rotary dial plus a linear slide wire 50 cm 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.

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Potentiometer Digital with electrode ‘PSAW’ (1030 )

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Null Detector ‘PSAW’ (1031 D )

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). While performing the experiment with four arm bridges, bridge oscillators & headphones are required in almost all the four arm bridges. Sometime good quality headphones are not available & also audibility of each student is different from the another. That’s why teachers are switching to null detector in place of headphone.

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Head Phone ‘PSAW’ (1031 )

Flexible type, with high resistance rece

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Headphone ‘PSAW’ (1031 )

A high resistance handset consisting of a pair of earphones, mounted on a spring steel strip head band. These headphones are suitable for any audio electric /electronic applications where output from the system is sufficient to drive a loudspeaker and are particularly recommended for use with all types of four arm bridges.

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Bunsen Burner brass pipe LPG/ Petrol with stop cock ‘PSAW’ (1032 A )

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