AMMETERSTest Instruments & Measuring DevicesFind: 1. accuracy2. %loading error3. true current4. measured current1. KARRoRmKA20002000400KA0.833 or 83.3%2. % loading error(1KA)(100%)% loading error(10.833)(100%)% loading error16.7%3. IoVRo202000Io0.01A or 10mA4. IwVRoRm202000400Iw8.33x103A or 8.33mAAn ammeter with a full scale Im can be shunted with a resistor RSH in order to measure currentsin excess of Im (Figure 8). The reason for shunting an ammeter is to extend the range of theammeter and, thereby, measure currents higher than the original full scale value.ES-14 Page 12 Rev. 0
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