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Step 5Precision calibration
Or, you can make the precision calibration...
You will need two programs “function generator” and a “oscilloscope”. I use “FG Lite” and “Oscilloscope 2.51 for windows 95″ (on download page). Learn the basics of using a oscilloscope, how to setup line-in of your pc audio card, how to set a input gain of audio card and oscilloscope so that there was no overdrive – i will not describe that here – if you do not have an idea on what i am talking about, just make the fast callibration.
Function generator set to sine, frequency 5KHz, gain at about 80% (on picture there is 400Hz, don’t mind that).
Left potentiometer turn right to the end, connect line-in of your pc audio card to RED point.
3rd image show how should look a proper clean signal
And 4th image show how look a overdrien signal with tops cutoff
If potentiometer is turned right to the end and despite that signal is overdriven, you will have to reduce signal from your pc, or, if nalayzer will be working in other device, you will have to add R/R divider or extra potentiometer to reduce the signal strength to proper value. If the signal is nice and clean, try to raise it a little bit by turning the potentiometer in left direction – but do not overdive. Do the same with the right potentiometer and GREEN point. Now, connect your pc audio input to BLUE point and then to YELLOW to check if signal is ok. At the end check if low-pass filter is working corectly, connect your pc audio line-in to YELLOW point, and slowly move the frequency slider from left to right, signal should vanish near 800Hz – 1KHz.
You will need two programs “function generator” and a “oscilloscope”. I use “FG Lite” and “Oscilloscope 2.51 for windows 95″ (on download page). Learn the basics of using a oscilloscope, how to setup line-in of your pc audio card, how to set a input gain of audio card and oscilloscope so that there was no overdrive – i will not describe that here – if you do not have an idea on what i am talking about, just make the fast callibration.
Function generator set to sine, frequency 5KHz, gain at about 80% (on picture there is 400Hz, don’t mind that).
Left potentiometer turn right to the end, connect line-in of your pc audio card to RED point.
3rd image show how should look a proper clean signal
And 4th image show how look a overdrien signal with tops cutoff
If potentiometer is turned right to the end and despite that signal is overdriven, you will have to reduce signal from your pc, or, if nalayzer will be working in other device, you will have to add R/R divider or extra potentiometer to reduce the signal strength to proper value. If the signal is nice and clean, try to raise it a little bit by turning the potentiometer in left direction – but do not overdive. Do the same with the right potentiometer and GREEN point. Now, connect your pc audio input to BLUE point and then to YELLOW to check if signal is ok. At the end check if low-pass filter is working corectly, connect your pc audio line-in to YELLOW point, and slowly move the frequency slider from left to right, signal should vanish near 800Hz – 1KHz.
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