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Test Lights - Electrical and Electronic Systems - Lab 5 | AT 121, Lab Reports of Automobile Engineering

Community College of PhiladelphiaAutomobile Engineering
Prof. Daniel J. Reed

Material Type: Lab; Professor: Reed; Class: Auto Elec & Elec Sys; Subject: Automotive Technology; University: Community College of Philadelphia; Term: Unknown 1989;

Typology: Lab Reports

Pre 2010

Uploaded on 08/18/2009

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AT 121 – Chapter 3, Lab 5 - Test Lights
Name :__________________________________ Date: ___________________________________
VI. ELECTRICAL/ELECTRONIC SYSTEMS
A8. Check electrical circuits with a test light; determine necessary action. P-2
Using a test lamp.
Now that you are familiar with using a DVOM to diagnose circuits, you can learn about another tool used to find out here
a circuit has a fault. There are two types of test lamps, high impedance and low impedance. We will be using a low
impedance test light. This type of test light can only be used to diagnose non-solid state (electronic or black box) circuits.
At no point should the test light ever be used for sensitive electronic diagnosis. The current the test light draws is too
much for sensitive electronic circuits. However, a test light is a very fast diagnostic tool for basic lighting circuits.
Part one: The ground side switch.
Setup the following schematic with your test board; Turn the board on, and ensure the circuit is complete.
1. Place the clip end of the test light on to the ground of the circuit.
2. Check for the presence of power at the following points and indicate whether the test light lights up.
Do not activate the switch.
a ) _____________________________________ (Light/ No Light)
b ) _____________________________________ (Light/ No Light)
c ) _____________________________________ (Light/ No Light)
d ) _____________________________________ (Light/ No Light)
e ) _____________________________________ (Light/ No Light)
3. Now, move the test light clip to (a) (power) and test again for the presence of ground.
Make sure the circuit is complete and active for this test.
a ) _____________________________________ (Light/ No Light)
b ) _____________________________________ (Light/ No Light)
c ) _____________________________________ (Light/ No Light)
d ) _____________________________________ (Light/ No Light)
e ) _____________________________________ (Light/ No Light)
Can the test light be used to find power and ground in a circuit? ______________________________
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Download Test Lights - Electrical and Electronic Systems - Lab 5 | AT 121 and more Lab Reports Automobile Engineering in PDF only on Docsity!

AT 121 – Chapter 3, Lab 5 - Test Lights Name :__________________________________ Date: ___________________________________ VI. ELECTRICAL/ELECTRONIC SYSTEMS A8. Check electrical circuits with a test light; determine necessary action. P- Using a test lamp. Now that you are familiar with using a DVOM to diagnose circuits, you can learn about another tool used to find out here a circuit has a fault. There are two types of test lamps, high impedance and low impedance. We will be using a low impedance test light. This type of test light can only be used to diagnose non-solid state (electronic or black box) circuits. At no point should the test light ever be used for sensitive electronic diagnosis. The current the test light draws is too much for sensitive electronic circuits. However, a test light is a very fast diagnostic tool for basic lighting circuits. Part one: The ground side switch. Setup the following schematic with your test board; Turn the board on, and ensure the circuit is complete.

  1. Place the clip end of the test light on to the ground of the circuit.
  2. Check for the presence of power at the following points and indicate whether the test light lights up. Do not activate the switch. a ) _____________________________________ (Light/ No Light) b ) _____________________________________ (Light/ No Light) c ) _____________________________________ (Light/ No Light) d ) _____________________________________ (Light/ No Light) e ) _____________________________________ (Light/ No Light)
  3. Now, move the test light clip to (a) (power) and test again for the presence of ground. Make sure the circuit is complete and active for this test. a ) _____________________________________ (Light/ No Light) b ) _____________________________________ (Light/ No Light) c ) _____________________________________ (Light/ No Light) d ) _____________________________________ (Light/ No Light) e ) _____________________________________ (Light/ No Light) Can the test light be used to find power and ground in a circuit? ______________________________

Part Two: The power side switch. Setup the following schematic with your test board; Turn the board on, and ensure the circuit is complete.

  1. Place the clip end of the test light on to the ground of the circuit.
  2. Check for the presence of power at the following points and indicate whether the test light lights up. Do not activate the switch. a ) _____________________________________ (Light/ No Light) b ) _____________________________________ (Light/ No Light) c ) _____________________________________ (Light/ No Light) d ) _____________________________________ (Light/ No Light) e ) _____________________________________ (Light/ No Light)
  3. Now, move the test light clip to (a) (power) and test again for the presence of ground. Make sure the circuit is complete and active for this test. a ) _____________________________________ (Light/ No Light) b ) _____________________________________ (Light/ No Light) c ) _____________________________________ (Light/ No Light) d ) _____________________________________ (Light/ No Light) e ) _____________________________________ (Light/ No Light) Part 3 : Conclusions. Did the position of the switch affect how the circuit preformed (power side vs. ground side)?

With the ground side switch, when the switch was open, was there current at the motor at all times?

With the power side switch, when the switch was open, was there current at the motor at all times?

What will happen on the power side switch of a jumper is placed from (a) to (c)? _______________ What will happen on the power side switch of a jumper is placed from (a) to (d)? _______________

Part 6: Using a stepped resistor to control a fan.

  1. Place the clip end of the test light on to the ground of the circuit.
  2. Check for the presence of power at the following points and indicate whether the test light lights up. Do not activate the switch. a ) _____________________________________ (Light/ No Light) b ) _____________________________________ (Light/ No Light) c ) _____________________________________ (Light/ No Light) d ) _____________________________________ (Light/ No Light) e ) _____________________________________ (Light/ No Light) Part 7: Using a SPDT switch to control lights. According the schematic which lights are the high beams, inner or outer? _________________________