Key Topic 74: Indicating Meters

Question 1

3-74L1: What is a 1/2 digit on a DMM?

A. Smaller physical readout on the left side of the display.
B. Partial extended accuracy on lower part of the range.
C. Smaller physical readout on the right side.
D. does not apply to DMMs.

Answer 1

B. Partial extended accuracy on lower part of the range.

Question 2

3-74L2: A 50 microampere meter movement has an internal resistance of 2,000 ohms. What applied voltage is required to indicate half-scale deflection?

A. 0.01 volts.
B. 0.10 volts.
C. 0.005 volts.
D. 0.05 volts.

Answer 2

D. 0.05 volts.

Question 3

3-74L3: What is the purpose of a series multiplier resistor used with a voltmeter?

A. It is used to increase the voltage-indicating range of the voltmeter.
B. A multiplier resistor is not used with a voltmeter.
C. It is used to decrease the voltage-indicating range of the voltmeter.
D. It is used to increase the current-indicating range of an ammeter, not a voltmeter.

Answer 3

A. It is used to increase the voltage-indicating range of the voltmeter.

Question 4

3-74L4: What is the purpose of a shunt resistor used with an ammeter?

A. A shunt resistor is not used with an ammeter.
B. It is used to decrease the ampere indicating range of the ammeter.
C. It is used to increase the ampere indicating range of the ammeter.
D. It is used to increase the voltage indicating range of the voltmeter, not the ammeter.

Answer 4

C. It is used to increase the ampere indicating range of the ammeter.

Question 5

3-74L5: What instrument is used to indicate high and low digital voltage states?

A. Ohmmeter.
B. Logic probe.
C. Megger.
D. Signal strength meter.

Answer 5

B. Logic probe.

Question 6

3-74L6: What instrument may be used to verify proper radio antenna functioning?

A. Digital ohm meter.
B. Hewlett-Packard frequency meter.
C. An SWR meter.
D. Different radio.

Answer 6

C. An SWR meter.