Topic: oscilloscope probes (Read 8105 times)

kgx · « **on:** February 05, 2010, 07:53:34 PM »

a friend at work had an old hitachi v-223 just sitting around in his garage and he asked me if i could use it for anything. of course, i said yes.

problem is he didn't know where the probes were for it. i'm assuming i can just use most any probe of the proper bandwidth and capacitance? i believe the v-223 is 20MHz and 23pF, but i don't know if the connectors are all the same or not.

thanks

Joseph Davis · « **Reply #1 on:** February 06, 2010, 01:45:02 AM »

I beat on a 20Mhz v-212 for a year, I liked it better than the Instek GOS-620 I have now despite bandwidth differences.

All 'scope probes are going to be BNC connectors, just grab something of decent quality and a complementary bandwidth.

kgx · « **Reply #2 on:** February 07, 2010, 02:50:34 PM »

perfect, thanks.

maybe ax-man will have some left over. i know they had a scope there last time i was in there, but they wanted like $125 for it. free>$125.

maybe now i can get some of the interface boards finished.

ifly87 · « **Reply #3 on:** February 07, 2010, 09:49:57 PM »

I bought a set of probes on ebay for like $30 a coupple years ago, still work great. I have an old ass analog o-scope though

nock · « **Reply #4 on:** February 08, 2010, 01:31:46 AM »

Quote from: Joseph Davis on February 06, 2010, 01:45:02 AM

I beat on a 20Mhz v-212 for a year, I liked it better than the Instek GOS-620 I have now despite bandwidth differences.

what didnt you like about instek?

im thinking of buying one of there digital scopes.

Joseph Davis · « **Reply #5 on:** February 08, 2010, 05:18:07 AM »

I have an analog unit, the screen is kind of dim. I've been tempted by their discounted variant of the Tek TDS2000 unit, but frankly the Tek warranty makes anything else seem stupid. It's warrantied for how ever long the model line is in production, plus seven years. You can't fuck with that.

nock · « **Reply #6 on:** February 08, 2010, 07:32:11 PM »

tek has a warranty?, i've been beating the shit out of my old 4-bay since i was 15. i want to see if its even possible to blow up a tek scope thats from the 80's, it repairs it self like the T1000. infact, it would seem like everything from the 80's is indestructible, my wife, my welder, my ego, most of the cars i've driven, a members only jacket.

ok, back to reality, my 4-bay is just to fucking big always has been. i like the instek gds-1042.

http://www.amazon.com/Instek-GDS-1042-MHz-Digital-Oscilloscope/dp/B001N4KHUA/ref=sr_1_2?ie=UTF8&s=miscellaneous&qid=1265671205&sr=1-2

a color scope for around 600 bucks is dam tempting.

Joseph Davis · « **Reply #7 on:** February 08, 2010, 07:58:47 PM »

Eh, the price isn't that great, IMO. I had Joe Lewis of FlenTek quote me $600 on a used but super clean TDS2004, four channel color screen 60Mhz scope with fresh recal. I've heard okay things about Instek when I hear any feedback at all, but that's the clincher.

nock · « **Reply #8 on:** February 09, 2010, 03:21:49 AM »

looks like i'll be droping them a line once i get my tax return.

patsmx5 · « **Reply #9 on:** February 09, 2010, 07:20:25 PM »

I use some cheap ebay probes on my 100mhz 2ch. tek, they work great.

Joseph Davis · « **Reply #10 on:** February 09, 2010, 10:28:05 PM »

You can probably pick up another 20Mhz Hitachi scope with probes for the price probes alone seem to cost on eBay. Shipping will be a little more, but meh.

nock · « **Reply #11 on:** February 10, 2010, 01:54:41 AM »

or goto radioshack and Jew

rig your own probe

http://www.cromwell-intl.com/radio/probes.html

SgtB · « **Reply #12 on:** February 12, 2010, 05:03:27 AM »

http://www.sparkfun.com/commerce/product_info.php?products_id=9625

Anyone see the DSO Nano yet? Sample rate isn't that high (1mhz), but it's pretty awesome for a scope the size of a phone. I'm thinking of getting one for my toolbag at work. PLC work isn't very high speed.

Joseph Davis · « **Reply #13 on:** February 12, 2010, 08:59:18 AM »

1 MHz sample rate = 500kHz capability.

SgtB · « **Reply #14 on:** February 12, 2010, 03:01:57 PM »

So after my educational journey through the internets, I've deduce that your statement is in reference to the fact that nyquist and filter attenuation will kick that things ass. Thanks for saving me some money.

Joseph Davis · « **Reply #15 on:** February 12, 2010, 03:22:27 PM »

Correct, anything greater than 500kHz and the signal will just alias and fall apart on screen. If you're trying to one-shot the waveform and log it accurately, that'll only happen at a much lesser frequency than 500kHz as you have to sample the waveform multiple times to reconstruct it accurately from a one-time blip.

Eh, it's still super cool and if I had money burning a hole in my pocket I'd pick one up. For "slow motion" automotive electronics it's actually fucking perfect.

SgtB · « **Reply #16 on:** February 12, 2010, 05:56:17 PM »

Yeah, I'm still on the fence. Most of the stuff I play with is under 1khz. $100 isn't too bad either especially seeing as it's an open OS.

EDIT: I wonder if plugin's could be written for it. It would be nice to have a simple datalogger. Some of my machines have nasty mood swings when I'm not there to see it. You could build some simple voltage transducers for it to use other sensors.

Joseph Davis · « **Reply #17 on:** February 12, 2010, 07:07:17 PM »

If you want cheap dataloggers, check Data-Q's lineup. They interface easily with NI stuff, and have SDKs for VB and C++/C# if you want to go it on your own.

nock · « **Reply #18 on:** February 12, 2010, 08:20:49 PM »

there are also several DMM's for process stuff that have data logging. i think most of them just make an excel file. might be worth it if you only need one channel.

SgtB · « **Reply #19 on:** February 12, 2010, 08:29:49 PM »

I could program a cheap uC too and dump it to an sd card.. I was thinking the display would be nice, but what's it matter if it's just logging. I may still pick it up for troubleshooting. I have some frequency based gear that picks up noise sometimes. My only concern is that the forum over at seedstudio is saying that the probes are a off resistance. Adding your own x10 probe would require cracking it open and tuning a cap. 80Vpp isn't very high for industrial. $:-\$

kgx · « **Reply #20 on:** February 14, 2010, 06:51:38 PM »

Quote from: SgtB on February 12, 2010, 05:03:27 AM

http://www.sparkfun.com/commerce/product_info.php?products_id=9625

Anyone see the DSO Nano yet? Sample rate isn't that high (1mhz), but it's pretty awesome for a scope the size of a phone. I'm thinking of getting one for my toolbag at work. PLC work isn't very high speed.

i think i just found my birthday present to myself.

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Author Topic: oscilloscope probes (Read 8105 times)