Hi, I have to start working on two boards TS-7200 and an fpga I was wondering what kind on oscilloscope should I get? With TS-7200, I am going to be using pc like protocols(rs323--i2c), over general purpose pins. Thank you. --------------------------------------- Posted through http://www.EmbeddedRelated.com
Oscilloscope for embbeded syetem.
Started by ●February 4, 2011
Reply by ●February 4, 20112011-02-04
On Feb 4, 8:45=A0pm, "aladin" <jc_322@n_o_s_p_a_m.hotmail.com> wrote:> TS-7200 > and an fpga > I was wondering what kind on oscilloscope should I get? > With TS-7200, I am going to be using pc like protocols(rs323--i2c), over > general purpose pins.If you'll only be debugging low-speed stuff like RS232, you can pick up a $40 pocket scope off eBay and it will be more than enough. There's a bit of a spectrum between cost and convenience when you're talking real scopes for real work, though - for instance, you'll probably be able to do a lot of your debugging on the FPGA side of the board with a 2- or 4-channel analog scope of say 100MHz bandwidth I have an old Tektronix TDS210 60MHz digital 2-channel scope (inexpensive on eBay now) on which I do practically all of my debugging. I also own, but unwisely loaned out, an HP 54645D scope with 2 analog channels and 16 digital channels - a mini logic analyzer - which is MUCH more useful. If you can get it, a scope like that makes your life very much easier because of the digital channels, and also because the HP scopes have great memory depth - capture a signal zoomed out, and zoom in after you've frozen it to see the detail. Saves you a lot of time tinkering with trigger conditions to capture a particular event.
Reply by ●February 4, 20112011-02-04
On Fri, 4 Feb 2011 18:46:22 -0800 (PST), larwe <zwsdotcom@gmail.com> wrote:>On Feb 4, 8:45�pm, "aladin" <jc_322@n_o_s_p_a_m.hotmail.com> wrote: > >> TS-7200 >> and an fpga >> I was wondering what kind on oscilloscope should I get? >> With TS-7200, I am going to be using pc like protocols(rs323--i2c), over >> general purpose pins. > >If you'll only be debugging low-speed stuff like RS232, you can pick >up a $40 pocket scope off eBay and it will be more than enough. >There's a bit of a spectrum between cost and convenience when you're >talking real scopes for real work, though - for instance, you'll >probably be able to do a lot of your debugging on the FPGA side of the >board with a 2- or 4-channel analog scope of say 100MHz bandwidth > >I have an old Tektronix TDS210 60MHz digital 2-channel scope >(inexpensive on eBay now) on which I do practically all of my >debugging. I also own, but unwisely loaned out, an HP 54645D scope >with 2 analog channels and 16 digital channels - a mini logic analyzer >- which is MUCH more useful. If you can get it, a scope like that >makes your life very much easier because of the digital channels, and >also because the HP scopes have great memory depth - capture a signal >zoomed out, and zoom in after you've frozen it to see the detail. >Saves you a lot of time tinkering with trigger conditions to capture a >particular event.Sounds a little like one of these http://www.linkins2.com/mso92.htm. I've been trying to convince myself that I don't really need to get yet another toy^H^H^H piece of test gear. It does seem to be one of the few USB 'scopes out there that actually has a decent sample rate. -- Rich Webb Norfolk, VA
Reply by ●February 5, 20112011-02-05
On Feb 4, 10:39=A0pm, Rich Webb <bbew...@mapson.nozirev.ten> wrote:> Sounds a little like one of thesehttp://www.linkins2.com/mso92.htm. > I've been trying to convince myself that I don't really need to get yetI am very reluctant to buy significant-cost PC-tethered instrumentation that can't be used standalone, though I have been tempted a few times (I2C/SPI grabber tools for instance). In the time I've owned my TDS210 I've been through OS/2 Warp through Windows 7 (with Linux and MacOS variants). Computers and TE just don't have the same lifecycle...
Reply by ●February 5, 20112011-02-05
In article <cb9ca845-c412-48a3-a4e9-7ec62adee4a6 @l18g2000yqm.googlegroups.com>, zwsdotcom@gmail.com says...> > On Feb 4, 10:39�pm, Rich Webb <bbew...@mapson.nozirev.ten> wrote: > > > Sounds a little like one of thesehttp://www.linkins2.com/mso92.htm. > > I've been trying to convince myself that I don't really need to get yetUSB tethering of instruments is great if you have an on the road requirement, or if flying with the scope a lot as well. However most scopes these days are not as big as they used to be with LCD screen meaning smaller cases as the need for high voltages and long tubes has gone away.> I am very reluctant to buy significant-cost PC-tethered > instrumentation that can't be used standalone, though I have been > tempted a few times (I2C/SPI grabber tools for instance). In the time > I've owned my TDS210 I've been through OS/2 Warp through Windows 7 > (with Linux and MacOS variants). Computers and TE just don't have the > same lifecycle...Could not agree more with the lifecycle as 1/ My bench has enough USB leads and other bits already, limits distance between scope and PC. In otherwords potentially clutters bench with PC(s). 2/ When working with kit that needs to talk to PC I have enough windows open already without adding more confusing things. Worst case you end up with two PCs due to some driver or OS mismatch. 3/ Occasionally you only really need to grab screenshots or waveform data for other use on PC. Unless it is a production test and qualification requirement that has to save lots of waveforms for each device under test, you often use the software to control the USB scope and display the image. 4/ If you end up doing stuff faster than about 10MHz, watch for scopes that do repetitive sampling, often I want a particular event trigger like 25MHz SPI data stream particular byte or packet, pixel event on a specific line of an image. 5/ Modern scopes often have abilities to trigger and decode on many busses and signal formats from video lines, to I2C address/conditions SPI bus activity, or even UART data. This can often be decoded on screen for you, saving a lot of time. The triggering on patterns means you can get to events quicker. 6/ Most scopes these days have on screen measurement capabilities see what is important to you. 7/ Ethernet connectivity is also possible for scopes meaning easier to grab lots of data to where ever. I ended up last year upgrading to a Tektronix MSO2024, 4 channels @ 200MHz BW, 16 digital channels, 1M sample storage depth with zooming 7inch VGA LCD I2C/SPI/UART decode/trigger USB storage (Type A) and USB control (Type B) connectors Ethernet connectivity VGA output for external monitor if required. If doing FPGA type work the digital channels will be a big bonus. I went for 4 analog channels for those times when you are trying to capture an SPI transaction and check for ringing, glitches, incorrect levels. The BIG caveat is how much money you have to spend on a scope, but look at it as an investment for longer lifespan than any PC. I eventually got rid of a Tek475 scope after nearly 12 years of service other than stored PCs, I had changed PCs three times in that time. -- Paul Carpenter | paul@pcserviceselectronics.co.uk <http://www.pcserviceselectronics.co.uk/> PC Services <http://www.pcserviceselectronics.co.uk/fonts/> Timing Diagram Font <http://www.gnuh8.org.uk/> GNU H8 - compiler & Renesas H8/H8S/H8 Tiny <http://www.badweb.org.uk/> For those web sites you hate
Reply by ●February 5, 20112011-02-05
aladin wrote:> Hi, > > I have to start working on two boards > > TS-7200 > and an fpga > > I was wondering what kind on oscilloscope should I get? > > With TS-7200, I am going to be using pc like protocols(rs323--i2c), over > general purpose pins. > > Thank you.Used to exclusively use a Tektronix 254. Sadly that died a while ago so now use the TPS2024. This has four isolated channels (useful for fault finding motor power drive circuits) and has 200MHz bandwidth, is totally portable and very lightweight to carry, and features a reasonable set of capture and analysis functions. <http://www2.tek.com/cmswpt/psdetails.lotr?ct=PS&cs=psu&ci=13304&lc=EN> -- ******************************************************************** Paul E. Bennett...............<email://Paul_E.Bennett@topmail.co.uk> Forth based HIDECS Consultancy Mob: +44 (0)7811-639972 Tel: +44 (0)1235-510979 Going Forth Safely ..... EBA. www.electric-boat-association.org.uk.. ********************************************************************
Reply by ●February 5, 20112011-02-05
"aladin" wrote>I have to start working on two boards > >TS-7200 >and an fpga > >I was wondering what kind on oscilloscope should I get? > >With TS-7200, I am going to be using pc like protocols(rs323--i2c), over >general purpose pins.I also suggest a good mixed signal scope for convenient handling. Look also at the Hameg HMO series, but currently the firmware has a flaw displaying digital channels with a time offset in Zoom mode. A TechTools Digiview logic analyzer is also nice (in addition to a "normal" scope) and worth the money (1/10 the amount of a MSO). Oliver -- Oliver Betz, Munich despammed.com is broken, use Reply-To:
Reply by ●February 5, 20112011-02-05
On 02/04/2011 06:46 PM, larwe wrote:> On Feb 4, 8:45 pm, "aladin"<jc_322@n_o_s_p_a_m.hotmail.com> wrote: > >> TS-7200 >> and an fpga >> I was wondering what kind on oscilloscope should I get? >> With TS-7200, I am going to be using pc like protocols(rs323--i2c), over >> general purpose pins. ><< snip >>> I also own, but unwisely loaned out, an HP 54645D scope > with 2 analog channels and 16 digital channels - a mini logic analyzer > - which is MUCH more useful. If you can get it, a scope like that > makes your life very much easier because of the digital channels, and > also because the HP scopes have great memory depth - capture a signal > zoomed out, and zoom in after you've frozen it to see the detail. > Saves you a lot of time tinkering with trigger conditions to capture a > particular event. >I love my Agilent 54622D. I bought it when I started consulting, and it's paid for itself several times over on embedded projects. Way spendy -- if there's a budget minded alternative now you may want to go for it, but if you're working for bux it's a sensible buy. -- Tim Wescott Wescott Design Services http://www.wescottdesign.com Do you need to implement control loops in software? "Applied Control Theory for Embedded Systems" was written for you. See details at http://www.wescottdesign.com/actfes/actfes.html
Reply by ●February 5, 20112011-02-05
>I was wondering what kind on oscilloscope should I get?To add another piece to the puzzle, some low-end HP - sorry, Agilent - scopes are re-branded Rigol units. (Chinese) They can be bought cheaper under the original brand. Then: http://www.eevblog.com/2010/03/31/eevblog-70-turn-your-rigol-ds1052e-oscilloscope-into-a-100mhz-ds1102e/ or (Tekway) http://www.eevblog.com/forum/index.php?topic=1571.0 -- Roberto Waltman
Reply by ●February 5, 20112011-02-05
In article <cb9ca845-c412-48a3-a4e9-7ec62adee4a6 @l18g2000yqm.googlegroups.com>, zwsdotcom@gmail.com says...> > On Feb 4, 10:39�pm, Rich Webb <bbew...@mapson.nozirev.ten> wrote: > > > Sounds a little like one of thesehttp://www.linkins2.com/mso92.htm. > > I've been trying to convince myself that I don't really need to get yet > > I am very reluctant to buy significant-cost PC-tethered > instrumentation that can't be used standalone, though I have been > tempted a few times (I2C/SPI grabber tools for instance). In the time > I've owned my TDS210 I've been through OS/2 Warp through Windows 7 > (with Linux and MacOS variants). Computers and TE just don't have the > same lifecycle...I got my TDS210 way back in the late 90s when I first started as a self-employed developer. I still use it now. When I got it, my wife doubted the wisdom of spending $1000 on a piece of test gear as it was a significant chunk of my income in the first lean years. On a cost per hour used, it has to be one of my all-time best buys, though. Since I do most of my work with processors having clocks under 20MHz, scope speed hasn't been much of an issue. A set of digital channels would be nice, as would more capture memory. However, I'm reluctant to go out and buy a newer scope just for those things. Mark Borgerson
