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Need a
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how to read and
oscilloscope
1) Put a RED LED in series with a
12 VDC source and a 330 ohm limiting resistor.
> predict and then measure VLED
and VRlim and IT.
> What is the rated forward voltage of a RED
LED?
> Why does a BLUE LED require a greater forward voltage?
LED TECH NOTES
HOW to read an
oscilloscope
read this over before proceeding
Need a
Calculator here it is
2) a) Build this half wave rectifier (one diode)
with 12VAC source
in series with a 1 Kohm resistor , connect an oscilloscope to channel A
across the resistor load.
***note
a ground
is needed now to act as reference for the oscilloscope
set: time base to 5.00 ms/div
set: Channel A to 10 v/div
Calculate: f and Vmax
across R1
> what type of electrical wave is generated at the
output of the power supply?
HOW to read an
oscilloscope
read this over before proceeding
Need a
Calculator here it is
3) Build a
bridge rectifier (shown below)
no
capacitor at first
set the following on the oscilloscope
> time 5.00 ms/div
this means that the
trace is sweeping the screen at at a rate of 1 div per .005s
> Channel A 5 V/div
this means that the
probe from channel A will deflect the trace 1 division for every 5V
measured (ie 2 div = 10V)
> add ground (reference)
the ground reference is
important for the simulator to measure a true voltage
> set Trigger to A
inputs to A trigger the
trace to sweep this can be triggered other ways
a) add no filtering capacitor to
oscilloscope in this instance
Determine frequency = ___________
b) install 47uF
cap in parallel to output of the power supply
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Q- what happened to the wave characteristics after
the capacitor was added?
c) install 1000uF cap
in parallel to output of the power supply
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Calculator here it is
Q- what happened to the
wave characteristics?
Need a
Calculator?
how to read and
oscilloscope
4) Thyristors
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