Quantcast Figure 8-1.  Proper Voltmeter Connection

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Figure 8-3.  Proper Ohmmeter Connection
TM 9-254 8-2. Meter Usage - Continued Figure 8-1.  Proper Voltmeter Connection (2) Current  measurements  (fig.  8-2).    When  making  a  current  measurement,  always  connect  the  current meter  in  series  with  the  circuit  to  be  measured.    This  is  necessary  because  of  the  fact  that  all  of  the circuit  current  must  pass  through  a  current  meter  in  order  to  establish  the  current  value  in  the  circuit. Prior to connecting a current meter, the operator should determine a few basic facts about the circuit. (a) Determine if the circuit current to be measured is DC or AC current.  Use only DC current meters in DC circuits.  Use only AC current meters in AC circuits. (b) When using DC current meters, observe circuit polarity when connecting the meter in series with the circuit. (c) If  the  quantity  of  the  current  to  be  measured  is  unknown,  always  select  the  highest  current  range available  on  the  meter.    If  the  selected  range  does  not  give  an  adequate  indication,  reduce  the range setting one range at a time until an on scale indication is obtained.   Figure 8-2.  Proper Current Meter Connection (3) Resistance measurements (fig. 8-3).  The ohmmeter is used to measure the amount of resistance in a circuit or in a circuit component itself.  Before using the ohmmeter, the operator should become familiar with a few basic rules. (a) Always    disconnect    the    source    of    power    from    the    circuit    before    attempting    a    resistance measurement. 8-3

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