Sarah Eno1 Scope A scope is a device that has measures the voltage across its input at a fixed rate....
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Transcript of Sarah Eno1 Scope A scope is a device that has measures the voltage across its input at a fixed rate....
Sarah Eno 1
DDScope
A scope is a device that has measures the voltage across its input at a fixed rate. The scopes you will be using take a voltage measurement every ns s, which it stores in its memory (has room for 2500 measurements). It stores it with 8 bits of precision (1/28=0.004). It then makes a graph of voltage versus time. The graph is refreshed whenever it receives a “trigger”. You set how which measurements it should display relative to the trigger time.
The trigger is a condition you set on a signal fed into the signal input. When the signal satisfies the conditions, the display is refreshed. Often, you feed the same signal into the display input and the trigger input, but not always (you’ll see tomorrow an example of when you would want different inputs).
Sarah Eno 2
DDoscilloscope
• oscilloscope refresher
• learn wavestar
Sarah Eno 3
DDScope Inputs
Sarah Eno 4
DDDisplay
1) ?
2) Good trigger received?
3) Trigger time
4) Delta_t trigger-center of display
5) Trigger level
6) Trigger level
7) Trigger slope
8) Trigger channel
9) lala
10) Time per tick, x axis
11) Volts per tick, y axis
12) Not sure
13) Ground level for each channel
Sarah Eno 5
DDAdjusting the Display
trigger
xaxis
yaxis
yaxis
Sarah Eno 6
DDPractice Signal Source
We’ll use a “signal generator” to make some voltages that vary with time, and then measure them using the oscilloscope, to prepare for tomorrow, when we’ll measure the signals from muons. “Coaxial cable” will take the “source” to the Scope.
Sarah Eno 7
DDVocabulary