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Inside the CRO
Electricity Tutorial 10
Inside the CRO
Graphic from Kerboodle
• The electrons are deflected by the electric fields between the Y-plates.
• The electrons are then deflected by the magnetic field between the X–plates.
• The electron beam has very low mass, so the instrument can respond very rapidly.
• You are NOT expected to know this for the exam.
Turning off the time base
When you turn off the time base, the magnetic field is turned off. The CRO shows
the height of the wave-form, but not the shape
Tuesday, 23 May 2017
Leeds City College
3
The CRO as a DC Voltmeter
1.5 V
0V
The voltage gain is set at 0.5
V/cm.
Tuesday, 23 May 2017
Leeds City College
4
The CRO as a DC Voltmeter
1.5 V
0V
The voltage gain is set at 0.5 V/cm. The time base is turned off.
Tuesday, 23 May 2017
Leeds City College
5
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