Resistance Measurement ENE 240 Electrical and Electronic Measurement (2/2008) Class 8‚ January 14‚ 2009 Werapon Chiracharit‚ Ph.D.‚ ENE‚ KMUTT werapon.chi@kmutt.ac.th 1 Analogue Ohmmeter • Permanent-magnet moving-coil (Galvanometer‚ θ ∝ I ) with a total resistance Rg • Series type ohmmeter with battery E • Resistance R to be measured • Rz to be zero-ohm-adjusted Rz R E + – Rg 2 1 Zero-Ohm Adjustment • Short circuit at the terminals 0Ω • Resistance reading is zero‚ R = 0 • Adjust
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MEASUREMENTS AND ELECTRONIC INSTRUMENTS (EE21004) TUTORIAL-I SECTION 1: QUALITY OF MEASUREMENTS Q1. (a) A meter ‘I’ has ± 5% accuracy on true value while another ‘II’ has ±5% accuracy on scale range. Both the meters have the same scale range. Calculate the ratio of accuracy of the two meters for a deflection of 10% of full scale range in each meter. [1:10] (b) A 0-100V voltmeter has 200 scale divisions which can be read to half a division. Determine resolution of meter in volt. [0.25 V] (c)
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reading and the percentage of loading error of each reading obtained with a voltmeter on: E = 20V – Its 10-V range. – Its 50-V range – Its 200-V range. The meter has a 30-kΩ/V sensitivity and connected across RA. RA 2.2kΩ RB 8.2kΩ Ohmmeter • Find the value of R‚ ¼ scale‚ ½
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of the wire‚ and the temperature of the room (®C). List any four pieces of equipment: Multimeter (ohmmeter)‚ g-clamps‚ nichrome wire‚ wire cutters. Apparatus: Multimeter (ohmmeter)‚ ruler‚ wire cutters‚ two leads‚ g-clamps‚ crocodile clips‚ nichrome wire‚ safety goggles. Tasks List any four tasks: I will gather the equipment I need. I will record the resistance of the wire using an ohmmeter. I will change the length (cm) of the wire. I will take three sets of results. Procedure Safety
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high resistance in series of the voltmeter with the current coil of the instrument. The actual voltage drop across the current coil of the voltmeter is only a fraction of the total voltage applied across the voltmeter which is to be measured. An ohmmeter is a measuring instrument used to measure the resistance placed between its leads. The resistance reading is indicated through a mechanical meter movement
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meter movement using variable resistor method. * To compute for the shunt resistance of 10mA and 100mA range ammeter. * To compute for the shunt resistance of 5 volts and 30 volts range voltmeter. * To determine the shunt resistance of ohmmeter with a 1.5 voltage. * To make a schematic diagram of the multimeter circuit. B. SCOPE AND LIMITATIONS * PMMC meter movements or the panel meter in the analog multimeter will not work correctly if directly connected to alternating current
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Intel’s 8051 Micro controller Basics What are Micro controller’s ? Why the name Micro controller ? Basically used for control actions.It is used to control the operation of machine using fixed program that is stored in ROM/EPROM and that does not change over the life time. What is MCS 51 ? Why to study 8051 ? August 28‚ 2008 Y.H.Dandawate 2 August 28‚ 2008 Y.H.Dandawate 3 Features of 8051 8 bit ALU. 16 bit PC and DPTR. 8 bit stack pointer and 8 bit PSW. 4K internal ROM 128 bytes of Internal
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OBJECTIVE For this piece of coursework I have been asked to investigate into the resistance of wires when the length is changed. INTRODUCTION The objective for my coursework (as already stated above) is to investigate how changing the length of wire can affect the resistance. There are factors which can affect how accurate our expriment is come on four levels. As in any scientific experiment‚ there are always variables ( "likely to change or vary subject to variation; changeable." ) which can
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Materials 5 meters of varnish insulated copper wire with diameter 0.5mm PVC pipe- 300mm length 3- 1.5 volt batteries with casing 3- jumper wires with crocodile clips Multimeter Scissors Infrared Thermometer 1 roll of insulation tape Procedure 1. Wind the wire around the PVC pipe. Fix the ends of the wires to the insulation tape. Remove about 3 cm. of insulation from the wire using the tips of the paper knife. Measure the resistance of the wire using the ohm
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Q 1. Draw the Pin diagram of 8051 micro-controller and give the functioning of following pins: (a) #PSEN (b) XTAL1 & XTAL2 (c) ALE (d) #EA Q 2. Draw the architecture of 8051 micro-controller .Also give the features of 8051 & description of registers (DPTR‚ PC‚ A‚ B). Q 3. Draw the PSW (Program Status Word) register of 8051 and describe all its bits .Also tell how register bank 3(RB3) can be selected. Q.4 Write PUSH instructions to push the contents of the registers on stack after the execution
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