Wednesday, January 20, 2016

week 2

Blog sheet week 2

1.     What is the role of A/B switch? If you are on A, would B still give you a voltage?
The role of A/B switch is Selects Simultaneous Voltage & Current metering for the “A” or “B” supplies. For example, when in the A position, the V and mA meters are connected to the “A” supply. When in the B position, the V and mA meters are connected to the “B” supply. So if I am on A, B would still give me a voltage.

2.     In each channel, there is a current specification (either 0.5 A or 4 A). What does that mean?
0.5A or 4A means current capacity: the 0-24V supplies are adjustable and are capable of current output of 0-0.5 amp. The fixed 5V supply has a current output of 0-4 amps.

3.     Your power supply has two main operation modes for A and B channels; independent and tracking. How do those operation work? (Video)
       video

        video
  
In the INDEPENDENT mode and the “A” and “B” power supplies are completely independent from one another: when used in the independent operating mode, the operating controls of the two power supplies are completely independent and either supply can be used individually or both can be used simultaneously.
There are two tracking mode: serious tracking and parallel tracking. In the series tracking mode, the “B” supply tracks the voltage of the “A” supply. In the series tracking mode the “A” and “B” supplies are connected in series, allowing a single output of 0-48V at up to 0.5 amps. In the parallel tracking mode, the two supplies are connected in parallel, allowing a single 0-24V output at up to 1 amp.

4.     Can you generate +30 V using a combination of the power supply outputs? How? (Photo)
      In order to generate 30 volts we put channel A and B in series tracking mode. We then adjusted to voltage of each channel to 15 volts. Then added together we get 30 volts.

5.     Can you generate -30 V using a combination of the power supply outputs? How? (Photo)
     To generate -30 volts we did the same thing we did to generate 30 volts, but we switched the polarity.



6.     Can you generate +10 V and -10 V at the same time using a combination of the power supply outputs? How? (Photo) 

      In order to get 10 V and -10 V at the same time we grounded the positive terminal for channel B, and then measured the voltage of channel B at the negative terminal. This gave us our -10 volts. When we measured the voltage at the positive terminal of channel A we got 10 volts. 






7.     Apply 5V to a 100 Ω resistor and measure the current by using the DMM (remember the setup in DC 3). Compare the reading with the current meter reading on the power supply. At what angle of the current knob makes the LED light on? If you keep on decreasing the current limit, what happens to the voltage and current? (Video)


      The angle of the current knob makes the LED light on is about 30 degree as the figure shows.

video

8.     Where is the fuse for the power supply? What is it for?
Fuse is a device used in electrical systems to protect against excessive current (From https://en.wikipedia.org/wiki/Fuse). The receptacle of fuse shows in the figure below.

9.     Where is the fuse for the DMM? What is it for?
Fuse is a device used in electrical systems to protect against excessive current (From https://en.wikipedia.org/wiki/Fuse). The receptacle of fuse shows in the figure below.

10.  What is the difference between 2W and 4W resistor measurements?
They are different in input protection limits. The maximum allowable input of 2W resistor is 500V dc or ac rms; the maximum allowable input of 4W resistor is 250V dc or ac rms;

11.  How would you measure current that is around 10 A using DMM?
In this picture you can see the normal set up to measure low current.
(picture of normal set up)


In this picture you can see we moved the positive lead to the 12A port. This would allow us to measure current close to 10A.
(picture of the 12A set up)




9 comments:

  1. Great job! Your Blog is very thorough.

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  2. On number 6, you did not achieve +10V and -10V at the same time. You switched a wire in between photos.
    We like how you added extra pictures into your blog to show what you are talking about.

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    1. The Switched wire appears to just be the lead to the DMM, the power supply's configuration remained unchanged so the result is still valid.

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  3. For #6 try to create a set up that allows you to read +10V and -10V at the same time. You should be able to read it without having to change any of the wires around. I cannot see the video on #7 so I do not have any comments for it. I really like how you have the blog week entries available on the side for convenience, in my blog we have all of the entries as a long list. Your way looks better.

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  4. This comment has been removed by the author.

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  5. I loved the angle drawing under #7.

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  6. #6 description is correct. But the image does not show that.

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    Replies
    1. Sorry, my bad. I now notice that only thing you change is where the multimeter is connected.

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