$259 DMM + 'scope
#3
Boost Pope
iTrader: (8)
Join Date: Sep 2005
Location: Chicago. (The less-murder part.)
Posts: 33,046
Total Cats: 6,607
I've seen a couple of rather interesting implementations on the iP(x)d-style devices recently. Most limit you to using the audio input, but a couple actually have a "real" interface on them. Sadly, I haven't found any that support two full-bandwidth analog channels, the best I have come across is one analog channel plus four logic-level inputs.
If somebody were to produce a reasonably-priced hardware+software combo to allow four analog channels with a reasonable bandwidth, that would probably be the killer app that convinced me to buy an iThing.
If somebody were to produce a reasonably-priced hardware+software combo to allow four analog channels with a reasonable bandwidth, that would probably be the killer app that convinced me to buy an iThing.
#4
Elite Member
iTrader: (10)
Join Date: Jun 2006
Location: Athens, Greece
Posts: 5,979
Total Cats: 356
Coolio. I have this, which is good for the money:
http://www.mcmelectronics.com/product/72-8474
and this:
http://www.home.agilent.com/agilent/...4618.920256.00
http://www.mcmelectronics.com/product/72-8474
and this:
http://www.home.agilent.com/agilent/...4618.920256.00
#5
Boost Pope
iTrader: (8)
Join Date: Sep 2005
Location: Chicago. (The less-murder part.)
Posts: 33,046
Total Cats: 6,607
I already have a two-channel USB scope. It's a cheaply-made Chinese device with poor documentation and a flimsy case, but it works fine for all of my low-to-moderate speed needs. And since I usually have my 12" laptop with me wherever I am, it's a workable solution.
To be honest, $800 is a bit much for the sort of work I use a portable scope for. Here in the lab, we've got several high-end Tek and Agilent scopes which are more than sufficient for high-speed work, I mostly just poke around under the hood of a car with my own personal unit.
Several years ago, some company (non US-based) was selling an adapter that allowed you to whichever Gameboy was new at the time as a scope. By the time I found them, they'd already folded... But that's what I'd really love to see- a cheap, compact, two-channel analog scope attachment for any of the current generation of smartphone devices.
To be honest, $800 is a bit much for the sort of work I use a portable scope for. Here in the lab, we've got several high-end Tek and Agilent scopes which are more than sufficient for high-speed work, I mostly just poke around under the hood of a car with my own personal unit.
Several years ago, some company (non US-based) was selling an adapter that allowed you to whichever Gameboy was new at the time as a scope. By the time I found them, they'd already folded... But that's what I'd really love to see- a cheap, compact, two-channel analog scope attachment for any of the current generation of smartphone devices.
#7
I've gotten to play with some of these at work. Idk what our customers use a 12GHz scope for, though.
http://www.tek.com/products/oscillos...0000_dsa70000/
Fluke makes some nifty little 60-100MHz handheld scopes, though I lost a little bit of faith in them when we sent one back for warranty repair (unit would not charge while in use) and we got it back really quick with a new calibration certificate. Funny thing is, it wouldn't even stay on long enough to complete a full calibration when I tried to afterwards.
http://www.tek.com/products/oscillos...0000_dsa70000/
Fluke makes some nifty little 60-100MHz handheld scopes, though I lost a little bit of faith in them when we sent one back for warranty repair (unit would not charge while in use) and we got it back really quick with a new calibration certificate. Funny thing is, it wouldn't even stay on long enough to complete a full calibration when I tried to afterwards.
#8
Boost Pope
iTrader: (8)
Join Date: Sep 2005
Location: Chicago. (The less-murder part.)
Posts: 33,046
Total Cats: 6,607
They're handy for simultaneously looking at multiple points along the same path in a high-speed DSP circuit. Remember that with digital scopes, the "faceplate" bandwidth is typically shared across all active traces. 10 Ghz / 4 traces = 2.5 Ghz per trace.
When it comes down to the gates-and-traces level, "digital" circuits are analog. Even if the clock speed of a given circuit is only in the hundreds of Mhz, you need the extra bandwidth to be able to see things like rise/fall times, ringing, clock-to-data phase, etc. In our products, the highest bitrate anywhere in the system is only 155 megabits/sec, but we have two scopes with multi-Ghz bandwidth (and ultra-low capacitance differential probes that cost more than my car) in order to be able to see the little minutae in the signals.
When it comes down to the gates-and-traces level, "digital" circuits are analog. Even if the clock speed of a given circuit is only in the hundreds of Mhz, you need the extra bandwidth to be able to see things like rise/fall times, ringing, clock-to-data phase, etc. In our products, the highest bitrate anywhere in the system is only 155 megabits/sec, but we have two scopes with multi-Ghz bandwidth (and ultra-low capacitance differential probes that cost more than my car) in order to be able to see the little minutae in the signals.
Thread
Thread Starter
Forum
Replies
Last Post
bigmackloud
Miata parts for sale/trade
19
01-08-2021 11:24 AM