"Vaiseshika" Industrial Kelvin Double Bridge
Type : 9404

Description "VAISESHIKA" Industrial Kelvin double Bridges Type : 9404 are important instruments in the measurement of resistance as low as 0.2 Micro ohms to highest value of 11 ohms. Industrial Kelvin Bridges employ 10 Standard Resistors drawn from well aged manganin sheet having excellent stability & reproducibility. Manganin has the quality of very low temperature co-efficient which is a critical parameter for resistance standards manufacturing. Four standard decade dials, ratio selector & plug keys facilitate accurate null detection.

Features

Specification

Range of measurement	:	0.2 micro-ohm to 11 ohm
Accuracy	:	Below 0.0001 ohm 0.0001 ohm to 0.01ohm above 0.01 ohm	+/- 0.2% +/- 0.1% +/-0.05%	or +/- 1 slide wire division
Slide wire	:	0.001 ohm divided in 500 equal divisions, (immersed in  oil)
Variable standard  resistance	:	10 steps of 0.01 ohm
Range factor setting   Total Range   Resolution  0.01  0.0011 ohm  0.2 micro-ohm  0.1  0.011 ohm  2 micro-ohm  1.0  0.11 ohm  20 micro-ohm  10  1.1 ohm  0.2 milli -ohm  100  11.0 ohm  2.0 milli -ohm
Switches		:  Hard silver plated giving constant values up to 10,000  operations
Current source		:  10 Amp DC.
Dimensions		:  48(L) x 30(B) x 17(H) cm. (Approx)
Weight		:  7 Kg. (Approx)

Accessories for Senior Kelvin Double Bridge:

Spot Reflecting Galvanometer Type 9407A (Essential Assessory) The Spot Reflecting Galvanometer will serve as a null detector to obtain the balance point in the circuit. The instrument is housed in a black bakelite case with lamp and scale arrangement for providing moving spot on the calibrated scale. The galvanometer resistance is of the order of125 ohms. The critical damping resistance will be1000 ohms and the galvanometer will be working on 220 volt AC
	High Amperage DC Souece 9400E This galvanometer is used for null detection. The sensitivity of the galvanometer is approximately 5 microvolt per mm. A moving light spot provides visual detection of the null point. The movement of the galvanometer is protected against shocks and vibrations. Clamping facility is provided to safeguard the moving coil against jerks and jitters during transit.Different shunts in the order of 1/0, 1/100, 1/1000 and 1 are incorporated in the Spot Reflecting Glavanometer to control the sensitivity of the galvanometer.Lamp and scale arrangement is built-in for spot null detection. Code 9400 B : 0 to 30 Amp. suitable for Bridge Type 9403 Code 9400 C : 0 to 10 Amp. suitable for Bridge Type 9404 Code 9400 D : 0 to 50 Amp. suitable for Bridge Type 9405
Conductivity Attachment Type 9400E This attachment is useful in the determination of specific resistance of a metal rod or metal sheet. Resistance per unit length of a sample can be measured with this attachment. Binding post teminals are provided which can hold the rod of 1/2" dia to 42 SWG Wire. The distance between two potential contacts is 50 cm.
	Current Reversing Switch Type 9400F The direction of current is reversed in a Kelvin Bridge during the course of measurements. Current reversal is necessary to eliminate the errors due to thermo.e.m.f. This current Reversing Switch is a rugged device for the purpose.