100hmz vs 200mhz oscilloscope
Hi I was planning to buy a oscilloscope for laptop board repair do i really need to buy a 200mhz ? or the 100mhz is enough?
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Re: 100hmz vs 200mhz oscilloscope
100Mhz scopes will show a waveform well over 200Mhz, it is just the limit where the readings start to lose accuracy.
i have seen a Rigol 100Mhz scope display a 350Mhz sinewave before!! -
Re: 100hmz vs 200mhz oscilloscope
So your saying that for laptop baoard repair 100mhz will do?Comment
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Re: 100hmz vs 200mhz oscilloscope
no, i dont repair laptops - for all i know you may need 500Mhz
all i'm saying is a 100Mhz scope will still show 200Mhz waveformsComment
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Re: 100hmz vs 200mhz oscilloscope
That depends on what sorts of problems you expect to be capable of diagnosing.
A power supply can probably be diagnosed with a 10 MHz 'scope. If you want to look at waveforms to/from a bank of DDR3, you'll likely be able to see "activity" with a slow 'scope but won't be able to verify Vhi and Vlo (as well as timing relationships between signals).
But, chances are, you wouldn't be able to recognize if something was subtly wrong (IME, most problems manifest "spectacularly").
The bandwidth of the 'scope essentially tells you what sort of an "RC" filter the 'scope represents. As frequencies of observed signals exceed the 'scope's bandwidth, they will be attenuated by this "filter" (as viewed by the 'scope). The more you (think you) need to see those fine details, the more bandwidth you want/need.
[Often, you can troubleshoot a product with a voltmeter and a logic probe]Comment
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Re: 100hmz vs 200mhz oscilloscope
i've only got a 100mhz o'scope and its all i ever neededComment
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Re: 100hmz vs 200mhz oscilloscope
Yup. I have a couple of 2G/s DSOs (500MHz b/w) but only use them to document waveforms (as a DSO, I can retrieve the contents of the waveform memory).
For more than 4 signals, I drag out a LA for the same goal.
Things tend to work -- or not.
OTOH, when you're designing stuff, you want to be able to verify that everything you think SHOULD be happening is actually, in fact, happening. E.g., monitoring the configuration values jammed into the SDRAM to ensure it's operating with the correct refresh interval, bus timing, etc.
[LA is a real win, there!]Comment
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Hello.
I have jut got my first analogue oscilloscope. An Isotech 620 20MHz.
I want to learn how not to damage it, and I found instructions on the internet obscure.
They talk about ground, earth, floating ground, this, that....
But they don't actually say anything anything useful so far.
I want to know:
Don't connect exactly this to exactly there or it blows up.
For example, I am tracing a signal from a function generator in an audio amp, or testing for voltages in different parts of a circuit.
I want to know what not to connect... -
I have recently acquired a Dynamco D7100 analogue oscilloscope without a user manual. As this is the first time I have owned or used an oscilloscope I would like to try and find an instruction book. The manufacturers no longer hold any information and a Google search only found one site but when I downloaded a 'service manual' all I got was gobbledegook. Any help would be gratefully appreciated or even pointers to a generic manual where I could learn more. -
All,
Some of you have helped me in the past and I am very appreciative of all the help! (I have fixed TVs/Stereos/ and other small appliances with your efforts...Thanks so much!!!
Today I went to a local HAM Radio Festival. It was one of the smaller ones in our area. My stepfather is the HAM operator. I tinker in electronics but am a Software Programmer (27 years now).
I was looking for a few odds and ends for some electronics work I have to do for the household/farm. Typically these type of shows have the grab bags or a electronics vendor... -
Hi, i have a Lenovo S145 that after 20 seconds shutdown and restart (it's working correctly on thse 20 seconds)
everything seems ok, but on Vcore inductor ( this is an i3 with just 1 switching power supply for CPU)
there is an output to teh CPU with a spike.. seems that inductor can't handle the input...
replaced the capacitor (330) and the inductor (R15) without any change
any idea? very thank you!
input of the inductor seems as usual... only strange thing is that the upper/lower voltages seems to be 21V (main power line is 19.3) ... but not sure this... -
Searched online but wasn't able to find. Trying to locate a copy of this document - AutoLeap Oscilloscope Handout.
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