190104d test equipment Flashcards
what does DVOM stand for
pg.2
Digital Volt-Ohm Meter
pg.2
digital display use an internal power source to
pg.3
supply the display and the other electronics contained in the meter
pg.3
LCD stands for
pg.3
liquid crystal display
pg.3
OL stands for
pg.3
Out of Limits
pg.3
“I” stands for
pg.3
Infinite
pg.3
easiest meter to use is the
pg.5
auto ranging meter (also called digital multimeters)(DMM)
pg.5
witch meter sets it self to the most accurate range within
each function
pg.5
auto ranging meter (also called digital multimeters)(DMM)
pg.5
improper meter use can destroy
pg.6
it’s self and expensive heavy equipment electrical circuit components and conductors
pg.6
what is meter loading
pg.6
the increase load on a circuit caused by connecting a voltmeter (a dicrease on resisters)
pg.6
As a general rule DMM have high impedance, How much?
pg.7
typically 10 MΩ or higher
pg.7
pre-check should be perform to ensure accuracy, they are
pg.8
- read DMM manual
- battery and display check
- meter check (no leads)
- meter and lead resistance check
- leads resistance check (do each lead separately)
- high amperage fuse and low amperage fuse checks
pg. 8
voltmeter check for
pg.8
- voltage
- electric pressure
pg. 8
a series or non-inductive ammeter uses a _____ connected in series with the circuit being tested.
pg.9
Shunt
pg.9
What do you not do when using your ohmmeter
pg.10
connect the meter to an energized circuit (the ohmmeter with provide the current)
pg.10
digital voltage measurements include:
pg.11
- open circuit voltage (OCV)
- voltage drop
pg. 11
what do you do if asked to find OCV (what is OCV?)
pg.11
measure the source voltage with no loads connected is OPEN CIRCUIT VOLTAGE
pg.11
digital amperage measurements include
pg.14
- series ammeter
- inductive ammeter (amp clamp)
pg. 14
ammeters can be inserted direct into a circuit in series with the load when measuring small current. How small of current?
pg.14
10 to 20 Amps
pg.14
what do you use to measure high current (20+ amps) measurements?
pg.14
inductive ammeters (amp clamp) pg.14
how does an amp clamp work
pg.14
- has it’s own power
- has it’s own internal circuitry
- measure the strength of the magnetic field (this is directly related to the amount of current)
pg. 14
what are test lights NOT RECOMMENDED for use on
pg.18
on any circuit, especially the ones that have electronic components
pg.18
what’s a circuit tester used for? how do you use it?
pg.19
- it’s capable of finding power, indicated by a red light
- it’s capable of finding ground, by a green light
you have to connect the positive and negative alligators to a power source
pg.19
