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Digitalmulti-meter - Date 11 April 2007 Grade Physics 211L...

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Date: 11 April 2007 Physics 211L The Construction of a Digital Multi-meter Name : Sarah Karam Section number : 1 Name : Toufic Daher Instructor : Ms. Sara Najm A. Resistance Box: Draw the circuit of the Resistance box, including resistance values B. Digital Multi-Meter Meter Reading VR124 (measured) Meter Reading VR500 (measured) Voltmeter Resolution V 1 (B 1 -B 2 ) 12.3 (mV) 1.230 V 50.6 (mV) 5.06 0.01 V 2 (B 1 -B 3 ) 122.4 (mV) 1.224 V --------- --------- 0.001 V 3 (B 1 -B 4 ) ---------- ---------- --------- --------- --------- V(nominal) -------------- 1.24 V -------------- 5.00 V -------------- 1 Grade: 100 1% Ω± 10 1% Ω± 1 1% Ω± 18000 5% Ω± 1200 5% Ω± 150000 1% Ω± 750000 1% Ω± 75000 1% Ω± 15000 1% Ω± 10000 1% Ω±
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1. Voltage Measurement : 1) How do the nominal voltages compare to the measured ones? Calculate the relative error between the most precise reading for VR124 and VR500 and the nominal voltage values. B1-B2 = 10000 B2-B3= 90000 B3-B4 = 900000 x DVM V R V R = DVM x V R V R = a) V DVM =12.3 mV For VR124 3 6 4 12.3 10 10 1.23 10 x V V - × × = = For VR500 3 6 4 50.6 10 10 5.06 10 x V V - × × = = b) V DVM = 122.4 mV For VR124 3 6 122.4 10 10 1.224 100000 x V V - × × = = For VR124 The most precise value of V x = 1.224 V 1.224-0.001=1.223 1.224+0.001=1.225 1.24 does not lie between these two values. This means that the calculated voltage is not accurate.
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