SubSystem : P3 |
Task
Title:
Timer / Delay |
Name: |
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IP2,P3,P6,OP1
Modules |
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1, Place the IP2, P3, P6 and OP1 modules onto the Bridge Power Base (see Fig 3.). Connect up the OnTrack module to hold these down. 2, Use six white leads to connect the modules to the component card as shown below. Now use two crocodile leads to join the modules to the meter. You will need to"stack" the negative crocodile lead when connecting to OP1 3, Turn the multimeter switch to the 20v. (D.C.) position. 4, Check your wiring is accurate and then connect the 9 volt power supply. |
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Testing and Investigating: Testing ..and how to adjust the amount of delay. 1, To ensure accurate timing you will need to discharge the 100uF capacitor by pressing the push switch on P3. There should now be no charge left in it. 2, Adjust the 500K variable resistor on the component card so that its arrow points down to the 6 o'clock position. 3, Start timing as you press and hold the input + trigger switch (on IP2) . 4, Watch the meter voltage reading change too. What voltage is reached when the alarm sounds. 5, Repeat 1 above and then move the variable resistor to the 3 o'clock position. 6, Now repeat steps 3 and 4. Look at your new time and voltage readings - are they different from the first set? 7, When you adjusted the variable resistor did its resistance go down or up?
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