LT1 Flashcards
DMM combine the features of what 3 meters?
Voltmeter, ohmmeter, ammeter
which of the four can’t a DMM read?
Temperature
Frequency
Sound
Diode Bias
A DMM cant read Sound
When selecting the range on your DMM. Why cant the range be in a high setting?
the meter will read OL
Most DMM’s have an input impedance of (meters internal resistance)
10 megaohms
define meter loading
when your meter becomes the load, this affects the reading
what does RMS stand for?
and another name for it is?
Root means squared,
Effective voltage
True RMS meters use an _______ circuit to calculate the RMS voltage
integrated
average responding meters use a ______ ______ to measure average value
Simple circuit
does polarity of the meter matter when using the AC voltage function
no
what is a Rectifier
device used to convert AC to DC
most meters can measure up to _____ amps before the internal fuse blows
10 amps
What allows you to read higher amps then you normally could
clamp on ammeters
when testing a diode how much voltage will be sent by the meter
2.5v
when connecting to a diode leads…
Black goes to ____
Red goes to____
cathode,
anode
if your diode is working correctly it should read
0.5v plus minis 0.2v
can a device be energized well doing a continuity test?
NO
the HOLD button is useful when
you cant see the display when using the meter
what does the PEAK HOLD button do
Will display the highest current that it reads
