Intro to Oscilloscopes PDF

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Summary

Introduction to oscillation and oscilloscopes in music...

Description

Introducing+the+Oscilloscope+

Before&opera)ng,&ensure&all&the&controls&are&in&their&‘normal’&posi)on.& & •  All&push&bu:on&switches&are&in&the&OUT&posi)on.& •  All&slide&switches&are&in&the&UP&posi)on& •  All&rota)ng&controls&are&CENTRED& •  The¢ral&TIME/DIV&and&VOLTS/DIV&and&the&HOLD&OFF&controls& are&in&the&calibrated&(CAL)&posi)on.&

Volts/Div&

Time/Div&

YRPOS& 1& moves& the& whole& trace& ver)cally& up& and& down&on&the&screen.& &

XRPOS& moves& the& whole& trace& from& side& to& side& on& the&screen.&& &

These& control& are& useful& because& the& trace& can& be& moved& so& that& more& of& the& picture& appears& on& the& screen,& or& to& make& measurements& easier& using& the& grid&which&covers&the&screen.&

1.  What&is&the&frequency&of&this&Sine&Wave&if&the&)me/Div&=&0.5ms?& &

1&second&=&1000&milliseconds&(ms)& 1&millisecond&=&1000µseconds&(μs)&

1.  What&is&the&frequency&of&this&Sine&Wave&if&the&)me/Div&=&0.5ms?& & Answer:&1khz&(1000&cycles&a&second).& 1&second&=&1000&milliseconds&(ms)& 1&millisecond&=&1000µseconds&(μs)&

2.  What&is&the&frequency&if&one&cycle&of&this&signal&occupies&8&cm&on&the&horizontal&scale&(1cm&=&1&Div),&with& a&horizontal&sensi)vity&of&5&μseconds/Div?&

1.  What&is&the&frequency&of&this&Sine&Wave&if&the&)me/Div&=&0.5ms?& & Answer:&1khz&(1000&cycles&a&second).& 1&second&=&1000&milliseconds&(ms)& 1&millisecond&=&1000µseconds&(μs)&

2.  What&is&the&frequency&if&one&cycle&of&this&signal&occupies&8&cm&on&the&horizontal&scale&(1cm&=&1&Div),&with& a&horizontal&sensi)vity&of&5&μseconds/Div?& & 5μs&X&8cm&=&40μs & &Frequency&=&1&/&T& & 1/40μs&&=&&1/0.00004&&=&&25,000&&=&&25khz&

3.  If&the&signal&being&displayed&occupies&6&ver)cal&cen)meters&and&the&ver)cal&sensi)vity&is&5&mV/cm,&what& is&the&magnitude&of&the&signal&(V)?&

1.  What&is&the&frequency&of&this&Sine&Wave&if&the&)me/Div&=&0.5ms?& & Answer:&1khz&(1000&cycles&a&second).& 1&second&=&1000&milliseconds&(ms)& 1&millisecond&=&1000µseconds&(μs)&

2.  What&is&the&frequency&if&one&cycle&of&this&signal&occupies&8&cm&on&the&horizontal&scale&(1cm&=&1&Div),&with& a&horizontal&sensi)vity&of&5&μseconds/Div?& & 5μs&X&8cm&=&40μs & &Frequency&=&1&/&T& & 1/40μs&&=&&1/0.00004&&=&&25,000&&=&&25khz&

3.  If&the&signal&being&displayed&occupies&6&ver)cal&cen)meters&and&the&ver)cal&sensi)vity&is&5&mV/cm,&what& is&the&magnitude&of&the&signal&(V)?& Magnitude&of&the&signal&(V)&=&voltage&sensi)vity&(V/cm)&x&ver)cal&deflec)on&(cm)&& & V&=&5mV&x&6cm&=&30mV&

Amplifying+a+Signal…and+seeing+the+amplifica:on+on+an+Oscilloscope+

=&

With&a&gain&of&20,&the&voltage&coming&out& is&20&)mes&the&voltage&going&in!!& & Viewing&this&on&an&Oscilloscope…&

Amplifying+a+Signal…and+seeing+the+amplifica:on+on+an+Oscilloscope+

Increasing&the&gain,&is&done&by& considering&this&sec)on…& & Op)on&to&bypass&the&1.35kΩ& resistor&by&placing&a&capacitor& between&pins&1&and&8.&

Z&=&Impedance& A&=&Gain&

2&x&15000&/&(150+1350)&=&20&(minimum&gain)& 2&x&15000&/&150&=&200&(maximum&gain…Vout&is&200&)mes&Vin).&...