Delmar's Unit 9 Flashcards
What type of meter movement is based on the principle that like magnetic fields repel?
d’Arsonval
What type of current does d’Arsonval movement operate on?
DC
What are the steps to reading a voltmeter?
Determine what quantity the meter is set to measure. Determine the full-range value of the meter. Read the meter.
Voltmeters have _____ resistance.
high
Ammeters have ______ resistance
low
What is used to change the value of DC ammeters?
shunts
What does an AC ammeter use to change the range setting?
a current transformer
How do clamp-on ammeters measure the flow of current?
by measuring the strength of the magnetic field around a conductor
What do ohmmeters measure?
resistance
Ohmmeters must never be connected to a circuit ______
with power
Digital multimeters generally have an input impedance of ____
10 megohmns
