Measurement of the low resistance by using Kelvin Double bridge method. Aim: – Measurement of the low resistance by using. Wheatstone Kelvin double bridge International Journal of. Posted on 02-Apr-2016 . Using ELVIS kit we can easily measure the resistance in more.Kelvin Double bridge method. Apparatus: – Regulated dc supply- 1no. Standardresistance coil- 1no. Kelvin’sdouble bridge kit. Digitalmultimeter- 1no,Patchcodes. Circuit Diagram: –Theory: –Kelvin’sbridge is a modification of whetstone’s bridge and always used inmeasurementof low resistance. It uses two sets of ratio arms and the four terminalresistancesfor the low resistance consider the ckt. The first set ofratio Pand. Q. The second set of ratio arms are p and q is used to connected togalvanometer to apt dat an Approx. For the Kelvin’s Double Bridge . It indicatestheresistance of connecting lead r. It has no effect on measurement provided thatthe twosetsof ratio arms have equal ratios. Equation (3) is useful however as it shows theerrorthatis introduced in case the ratios are not exactly equal. It indicates that it isdesirable tokeepr as small as possible in order to minimize the error in case there is a diff. The Kelvin Bridge is a variation of the Wheatstone bridge which enables low resistances to be measured. The measurement range would typically be 1m P/Q and p/q. R=P/QSObservation Table: –P(ratio armresistor)Q(ratio armresistor)Standardresistor. SRmeasuredvalue. Ractual. Procedure: –1)The circuit configuration on the panel is studied. Supply is switched on and increased upto 5v. The unknown resistance is connected as shown . The value of P,Q was selected such thata. P/Q=p/q. 5) Swas adjusted for proper balance and balance value of s was balanced. The value of known resistance was calculated. Precautions- 1) Checkall the connections before turning ON the power supply. Do not exceed the value of 5v. Note the readings accurately. Result- The observed value of unknown resistance is. Viva Questions: 1)Why this method iscalled as double bridge method? Canthis method be beneficial for measurement of low value ofresistanceor not? Kelvin's double bridge may be used for precision mesurement of four-terminal low resistances. Four terminal resistors have two current leading terminals. Glentest Tel: +86 21 65921024 Fax: +86 21 65921514 Address: 401/3, No. 365 Guanglingsi Road, Shanghai 200082, China TEST INSTRUMENTS SPECIALIST. SSIET/ EMI LABORATORY EXPERIMENT NO-1 Aim:- Low Resistance Using Kelvin Double Bridge We aim to measure the resistance of a given resistor using Kelvin Double Bridge and. About; Measurement of the low resistance by using Kelvin Double bridge method. For the Kelvin’s Double Bridge.It indicates.
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