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MEASUREMENT OF ELECTRICAL QUANTITIES
| The purpose of the work. To get acquaintance with work principles, classification and basic metrological characteristics of electric measuring instruments. To determine resistance using an ammeter and a voltmeter | Devices of and accessories Electrical scheme for resistance determination |
Task 1. Get acquaintance with the electric measuring instruments
1.1. Get acquaintance with the devices and put down characteristics of ammeter and voltmeter into tables 3 and 4.
1.2. Calculate the scale factor for all measurement ranges of the electrical devices.
Enter the results into table 1; 2.
1.3. Determine measurements absolute error using the accuracy class and measurement range of electrical devices according to the formulas:
Enter the results into table 1, 2.
Table 1
| Ammeter | Measurement range Imax, A | Amount of pitches N, pitch. | Scale factor C, A/pitch | Accuracy class  %
| Absolute error DI, A | Ammeter resistance RA, W |
Date: 2015-01-12; view: 1410
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