EM-1 Electronics 1 Ch 9 Test Equipment and Measurements

A “basic meter movement” is essentially a(n)

• Ammeter

• Ohmmeter

• Voltmeter

• Multimeter

An analog ammeter has

• low internal resistance

• high internal resistance

• a battery inside

• no moving parts

If an ohmmeter has a zero-adjust pot, but you

cannot get a zero reading when shorting the leads

together, you should

• Keep one hand in your pocket

• Use a shunt

• Replace the battery

• Use a multiplier

The technician must use the most care when

measuring:

• Low Resistance

• Low Current

• Low Voltage

• High Voltage

Safety precautions when measuring high voltage

include

• removing metal watches and rings

• wearing metal watches and rings

• keeping both hands in your pocket

• thinking about something else to take your mind off the danger.

Safety precautions when measuring high voltage

include

• wearing metal watches and rings

• Removing teeth fillings before working on high voltage

• keeping one hand in your pocket

• Making out a will

To measure high current a(n)

• high voltage multiplier probe is used

• megger is used

• external shunt is used

• series load is used

To measure very high voltage

• a shunt is used

• a high voltage multiplier probe is used

• a megger is used

• a series load is used

You should be careful not to touch the leads tips

when measuring resistance to avoid

• high voltages present

• low current from the meter

• a parallel current path thru your body

• frying the circuit under test.

Multimeters measure

• voltage drop

• current flow

• circuit resistance

• all the above