# User:Brian P. Josey/Notebook/Junior Lab/2010/08/23

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## Junior Lab Notes, Oscilloscope

Brian P. Josey 18:52, 23 August 2010 (EDT) loose disorganized notes for the class, will organize soon when I have a good system worked out.

Things that I've figured out (function generator):

• Range: changes the order of magnitude that the frequency changes on
• Duty Cycle: changes the distance between consequitive peaks in the signal
• CMOS Level: is still a mystery
• DC Offset: adds or subtracts a constant voltage to the whole of the signal
• Output Level: the magnitude of the signal
• Sweep: has two main points and two switches:
• lin/log: changes whether it sweeps through frequencies linearly or logarithmically
• ext/int: switches between and internal and external source
• time: the time it takes to cycle between frequencies
• width: the range of frequencies that it will sample through

On the oscilloscope:

• Position knob: changes moves the signal on the screne
• Volts/div and Sec/div: changes the scale of the graph

Setting up the cursor:

• hit the cursor button, select what you want to measure on the first button
• select the channel that you want
• use the position knobs to change the location of the cursors, a light will come on to indicate that the cursors can be moved with the knobs
• display will display the difference between the two cursors, and their individual locations
• channel one will be cursor one, and channel two would be cursor two

### Procedure

Using the procedure on the course webpage, here's a link.

Set up the frequency at 250 volts Function goes from two lines below the horizontal, to two above the horizontal, with each line representing 1 volt, giving a measured voltage of 4 volts. Using the cursors we get 3.96 volts. Using the measure function, it oscilates between 3.92 V and 3.88 V, spending equal time at both, so I measure it at 3.90 V, the mean value.

Large Amplitude

• by grid: 5.5 grid at 5 V per line for 25 V
• by cursor: 22.6 V delta
• by measure: 22.8 V

Small Amplitude

• by grid: 5.5 grid at 500 mV for 2.25V
• by cursor: delta= 2.18V
• by measure: 2.18 V

Large DC Offset

• by grid: 7.75 V
• by cursor: 7.76 V
• by measure: 7.76V

If the graph goes off of the screen, the oscilloscope has to estimate the values.

.01 μF 10 kΩ

## Ideas for set writing up

Notebook bad, need to keep work and school separate so that it's easier to search through them individually. Page with headers as: