The Oscilloscope [Deleted]

[ElectroMaster]

ElectroMaster submitted a new article:

The Oscilloscope - The oscilloscope is basically a graph-displaying device - it draws a graph of an electrical signal.

The oscilloscope is basically a graph-displaying device - it draws a graph of an electrical signal. In most applications the graph shows how signals change over time: the vertical (Y) axis represents voltage and the horizontal (X) axis represents time. The intensity or brightness of the display is sometimes called the Z axis. (See Figure 1.) This simple graph can tell you many things about a signal. Here are a few:

• You can determine the time and voltage values of a signal.
• You...

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[sashikanta]

excellent.................

 

[Tony Stewart]

I've used a scope for many useful things.

I wanted to evaluate the precision of HDD read/write heads for production, and ability to reject adjacent track signals especially if the servo moved off track. So I used a triangle generator to inject an error signal into the servo position error loop and used that for the X axis in XY mode and observed the ratio of Read signal modulation and crosstalk from adjacent tracks using extreme +/- % track offsets.

This same method I used in early days to get a linear graph of a high Q BPF and notch filter.

In some most cases analog scopes had a Z axis for modulation of the trace intensity and if biased correctly could be used to display video images with a vertical and horizontal sweep sawtooth to control X & Y while the video sync tip would blank the retrace just like a TV.

WIth a spectrum analyzer you can see the modulation in zero sweep mode, but if you put the video out into a scope , you can see it again and hear it with vertical channel Output on the back into high impedance headphones.

When I was doing drop tests with production 5.25" HDD's in packing material, I used accelerometers but uncertain of its calibration so I used storage mode and used the -1g vertical drop to calibrate the output on DC couple mode somI could record the DUT shock in the pack in +g's. After confirming what I expected,,I then discovered a convenient formulas for predicting 'g' level .

g shock level = drop height / stop height. = deacceleration / acceleration ratio in g's.
assuming a linear initial response.

So 1m drop into 1cm stop =100 g

 

[Bloodninja]

thank you so much for the excellent tutorial

 

[ElectroMaster]

This resource has been removed and is no longer available.

 

[timmytandian]

yesterday i had oscilloscope experiment in laboratory.. nice one

 

[remocon]

i dont know TTF,call you tell me? if i want to test 90KHZ

 

[remocon]

sorry not TTF, is FFT

 

[dominiz]

Wonderful tutorial, thanks