Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
76 Cards in this Set
- Front
- Back
accumulation of positive or negative charges on insulators or conductors
|
static electricity
|
|
two types of esd failures
|
intermittent and catastrophic |
|
the simple theory of esd control
|
no charge = no discharge
|
|
esd occurs in switches, mishandling components, and between what materials
|
materials with different potentials
|
|
most important step taken for controlling esd
|
putting on an antistatic wrist strap |
|
provides connection to wearers skin and ground
|
antistatic wrist strap |
|
general material wrist straps are made of |
conductive material |
|
resistor value that is in series with the strap to ground |
|
|
how is an antistatic wrist band worn
|
in contact with wearers skin |
|
why do antistatic wrist straps have a quick release mechanism |
for emergencies |
|
3 common wrist strap cuffs |
elastic adjustable, metal expansion, hook and loop |
|
if a wrist strap fails while testing what should you do |
replace the faulty ground or replace strap |
|
when should you not use a wrist strap |
when power is applied to the circuit you are working on |
|
favorable grounding points |
unpainted metal |
|
hand held test tools used to troubleshoot cables w/I the LAN. |
LAN cable testers |
|
"wake up" button |
controls display backlight |
|
mode that allows TDR analyzer tests
|
single test |
|
What is attenuation |
decrease in signal strength over a length of cable |
|
undesirable signal transmission from one cable pair to another |
crosstalk |
|
most common cause of cable faults |
poor cable connection |
|
multimeters are used as
|
voltmeter, ohmmeter, anmeter |
|
ZDENEK |
YA MA |
|
big blue digital shift button function |
shifter between functions |
|
range switch location on a multimeter |
lower center |
|
what does the hold button do on a multimeter |
freezes reading display |
|
never connect an LAN to |
telephone lines
|
|
what must you first do with a shorting probe
|
de energise equiptment and discharge capacitors |
|
measurements while using the A ports on a multimeter |
Current |
|
what can cause a multimeter to blow a fuse |
placing probes across a powered circuit |
|
order in which you connect multimeter probes |
black (common) lead first then Red (live) lead |
|
how is voltage measured across a circuit with a multimeter |
in parallel |
|
what do you do just prior to energizing the circuit |
attatch a probe to a test point |
|
what do you do to a circuit under test while measuring current |
open circuit |
|
what is done to a diode before testing with a multimeter |
electronically isolated |
|
when testing diodes you must |
reverse the leads |
|
Germanium diode voltage |
0.3V |
|
Silicon diode voltage |
0.7V |
|
what a multimeter sends through a diode to measure votage drop |
A current |
|
obvious thing to check for before troubleshooting |
Blown fuses, clean contacts, good connections |
|
troubleshooting method that has technical manuals for proceedures to follow particular symptoms |
Proceedural |
|
what is halfsplitting |
starting troubleshooting proceedures within the middle of the circuit |
|
todays circuits are contained on |
circuit boards |
|
Good fuse |
|
|
Bad fuse |
((--- ---)) |
|
volts/div knob adjust what on an o-scope |
amount of voltage required to deflect the beam distance for amplitude |
|
control on o-scope that determines the period time |
time/division knob |
|
triggering knobs on o-scope are to |
stabilize the display |
|
first step taken while conducting measurements on high voltage equiptment |
de-energize the equiptment |
|
1 to 1 probes display |
voltage equal to the voltage of the circuit being tested |
|
why do you let the scope warm up |
to stabilize the internal circuits |
|
overcompensated |
turn clockwise |
|
undercompensated |
turn counterclockwise |
|
measurements an oscopes used for
|
time, phase, amplitude, and other waveform charecteristics |
|
measurements of amplitude is measured
|
Vertically |
|
when can a faulty circuit card be swapped out |
when a fault is officially found because its expensive to replace |
|
ideal moisture setting for esd |
medium |
|
three things done everytime prior to using a wrist strap |
clean, inspect, test |
|
ohms law |
E=R x I |
|
when is the no hand rule applied
|
anytime you are touching a circuit |
|
what regenerates the voltage of the output signal on the RF signal generator
|
Attenuator |
|
two ways a power meter takes measurements |
direct and indirect |
|
power meter connected directly between the transmitter output and the load |
direct |
|
2 types of RF power that can be measured by a power meter |
forward and reverse |
|
direction the arrow on the attenuator needs to point when measuring incident and reflected power |
towards the load |
|
2 bridge circuits used with indirect power measurements |
detection bridge and compensating/metering bridge
|
|
pulse parameters the pulse generator provides full control over
|
timing, levels, and edges |
|
power meters give automatic and manual measurements of |
radio freq and microwave power levels |
|
must be verified with the fuse of the power meter before powering it on |
rating of the fuse |
|
over range capability of the digital power meter |
20% |
|
the two power range dials for the power meter |
8484A and 8481A |
|
pulse generator must be connected to the protective conductor of the power cable |
protective ground terminal |
|
generator transition mode involves reverse recovery times of transistors and diodes |
analog fixed transition mode |
|
generator transition mode that involves stress tests of capacitors and thyristors |
analog linear transition mode |
|
waveshape range of the external input on the pulse generator |
plus or minus 20 V |
|
calibrated networks of resistors are called
|
attenuators |
|
|
|