BK Precision 4011A Instruções de Operação descarregar pdf (Página 57)

Appendix B: Equipment and Instrument Circuits

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tors marked with a black dot on the Hampden ACWM-100 wattmeter (Figure B.14). In the

wattmeter circuit diagrams in this lab, this connection is labeled “+”.

AMPS

VOLTS

Jumper

Figure B.14: Jumper on wattmeter “+” connection

To measure power on a three-phase system one could employ what is called the two wattmeter

method, in which two wattmeters are connected as shown in Figure B.15. The total three-phase

power is then given by the sum of the two wattmeter readings.

Figure B.15: Two Wattmeter Connection for Three-Phase Load

To demonstrate that the sum of the readings is the three-phase power, one can start with the defi-

nition for what each wattmeter is reading





 

ab a

cb c

W V I



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BK Precision 4011A Instruções de Operação Página 57