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TM 9-2320-360-34-1 2-4.   INTRODUCTION TO LOGIC TREE TROUBLESHOOTING (CONT) (b) Set  the  function/range  switch  to  the  desired  ohm  position.    If  the  magnitude  of  the  resistance  is  not known, set the switch to the highest range, then reduce until a satisfactory reading is obtained. (c) If the resistance being measured is connected to a circuit, turn ENGINE switch OFF. (d) Connect test leads to the circuit being measured.  When measuring high resistance, be careful not to contact  adjacent  points,  even  if  they  are  insulated.    Some  insulators  have  a  relatively  low  insulation resistance which can affect the resulting measurement. (e) Read the resistance value on the digital display. (2) Continuity Checks (a) Place the function/range switch in any ohm range. NOTE Some  meters  show  '1+m  ',  or  simply  '1'  when  function/range  switch  in  any  ohm position. (b) Connect the red lead to the volt-ohm connector and black lead to COM input connector on the meter. With the test leads separated or measuring an out-of-range resistance, the digital display will indicate 'OL' (overlimit). (c) Put one test lead probe at one end of the wire or circuit to be tested.  Use the other test lead to trace the circuit.  When continuity is established, an ohm symbol will appear in the upper left corner of the digital display.  If contact in the wire is maintained long enough (about 1/4 of a second), the OL will disappear and the resistance value of the wire or circuit will appear next to the symbol. (3) Voltage Measurements (a) Connect the red test lead to the volt-ohm input connector and the black lead to the COM input on the meter.  If a DC-AC switch is present, make sure it is switched to the DC position. (b) Set  the  function/range  switch  to  the  desired  volts  position.    If  the  magnitude  of  the  voltage  is  not known,   set   the   switch   to   highest   DC   voltage   range   (50VDC).      Then   reduce   the   range   until   a satisfactory reading is obtained. (c) Connect  the  test  leads  to  the  circuit  being  measured.    Voltage  measurements  are  always  taken  at pins, sockets, Battery + or ground.  Following the voltage measurement point, the color test lead used is given in parenthesis (red is volt-ohm connection, and black is the COM connection). 2-4

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