Tyll Hertsens Posted January 6, 2011 Report Posted January 6, 2011 (edited) This thread makes me happy. Oh, I have a simple little digital Tek scope and it's sweet for basic stuff. I want one of these ... that disappears when I'm not using it. Edited January 6, 2011 by Tyll Hertsens
kevin gilmore Posted January 6, 2011 Report Posted January 6, 2011 I want one of these ... that disappears when I'm not using it. Good luck with that problem. But remember... Its portable... It has a handle on the top. (actually 2 on that one)
plinden Posted January 16, 2011 Report Posted January 16, 2011 For a cheap, good quality scope have a look at this ($359 incl shipping - a bargain) http://www.dealexcel.com/rigol-ds1052e-50mhz-band-widths-2channel-digital-oscilloscope_p363.html I bought one. Communications is poor but the unit turned up in about two weeks. There is a sofware mod to increase the bandwidth to 100Mhz+ (PM me for this)
mypasswordis Posted January 16, 2011 Author Report Posted January 16, 2011 For a cheap, good quality scope have a look at this ($359 incl shipping - a bargain) http://www.dealexcel.com/rigol-ds1052e-50mhz-band-widths-2channel-digital-oscilloscope_p363.html I bought one. Communications is poor but the unit turned up in about two weeks. There is a sofware mod to increase the bandwidth to 100Mhz+ (PM me for this) Wtf did you read the thread? We've talked about everything you just mentioned.
Craig Sawyers Posted January 16, 2011 Report Posted January 16, 2011 From reputation, the 2465s are supposedly the best analog scopes ever made. They are also one of the Teks which have a proprietary IC in them that can go bad, rendering the scope useless. Only supply of said IC is a donor unit. And it may also be bad. Too bad Tek listened to their accountants and shut down their IC fab Walter Shawlee at Sphere http://www.sphere.bc.ca/test/ was offering a repair service on those IC's. Problem was that they (I think it is the Y amp chip with an integral heatsink) operated very hot, and there was a bond wire failure. Walter used to collect a bunch from people with dead scopes, ship them to Japan where he had found a guy who would take the can off and re-wire-bond them.
Craig Sawyers Posted January 16, 2011 Report Posted January 16, 2011 (edited) This thread makes me happy. Oh, I have a simple little digital Tek scope and it's sweet for basic stuff. I want one of these ... that disappears when I'm not using it. That is a 547 with 1A4 if I'm not mistaken. Hybrid with quite a good mix of sand and tubes. 50MHz bandwidth. Heh. I'm a bit of a Tektronix and test equipment geek. I have a bunch of ancient stuff (545A, 547, two 545B, 585A, two 575's etc) and a pretty much complete set of 7000 series scopes and plugins. That is not counting the Fluke/HP cal lab, and a bunch of General Radio stuff. The scopes that get used the most are a 475DM44, a 7904 and a 577 curve tracer. My wife says that there is a very fine dividing line between "collector" and "mental illness". But I'd say that for total flexibility, a 7000-series scope takes a lot of beating - plugins will do just about everything from sampling up to 14GHz, a real time bandwidth of 500MHz for the 7904/7904A, spectrum analyser plugins, etc etc. Edited January 16, 2011 by Craig Sawyers
The Monkey Posted January 16, 2011 Report Posted January 16, 2011 Guys, sorry for the horribly newb question, but what are the primary uses for an oscilloscope in audio? Would it be of any use to a beginner DIYer like myself? I guess what I'm wondering is what I would need to provide some sort of meaningful measurements/data about my gear.
cetoole Posted January 16, 2011 Report Posted January 16, 2011 (edited) I like my 7704a, fun little piece of kit. Wanted a 7904a at the time, just couldn't justify the cost. It has a handle too, makes it nice and portable. Edited January 16, 2011 by cetoole
Pars Posted January 16, 2011 Report Posted January 16, 2011 That one is nice and clean Colin. Fun toy
Dusty Chalk Posted January 16, 2011 Report Posted January 16, 2011 Yeah, it looks portable. I think one of the DIY'ers or Tyll should answer Dinny's question, as they are more the sort of people (circuit diagnostician, measurements publisher) that would use an oscilloscope.
Craig Sawyers Posted January 17, 2011 Report Posted January 17, 2011 There are two yahoo groups that are excellent for this sort of stuff. The first is Tekscopes (with 5000-odd members) and the other is hp-agilent-equipment (2200 members). What scope should I buy? is a very frequent question. However, HP had great strengths in many electronics instrument products, but not really in scopes. So join just Tekscopes and ask the question - we're a helpful bunch and the combined might of the group will help as best we can.
Kerry Posted February 23, 2011 Report Posted February 23, 2011 I just got this combo Scope + Function Wave Generator: http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=260729602293&ssPageName=STRK:MEWNX:IT It arrived a couple of weeks ago and I only just turned it on for the first time... just too busy these days. I'll post back on how I like it once I figure out how to use it
luvdunhill Posted February 23, 2011 Report Posted February 23, 2011 (edited) cool, I'd be interested to see the rise time of the function generator on a square wave. Most modern ones aren't great that I've seen (compared to say a beta22 specifications), and it would be nice to have another alternative. I can very much recommend the Tek CFG280, that's what I have and it's very solid unit. It has the advantage of being able to apply a DC offset to the waveform, which means you can do things like bias devices. It's a very handy feature in fact. It does other cool things as well, but this is my favorite feature so far. Edited February 23, 2011 by luvdunhill
Kerry Posted February 23, 2011 Report Posted February 23, 2011 The generator does support a DC offset of +/-10V. The rise time of a square wave is <20ns (@ 1KHz, 1 Vpp)and the square wave upper limit is 3MHz.
luvdunhill Posted February 23, 2011 Report Posted February 23, 2011 nice! that's nearly identical to my Tek!
luvdunhill Posted July 14, 2011 Report Posted July 14, 2011 I'm considering selling a Tek TDS1012, contingent on another purchase. It's minty and has all the original documentation, accessories and box, etc. all of which are in excellent condition. I purchased it at Fry's. Includes two Tek probes as well. I was thinking $500 shipped. Thanks!
luvdunhill Posted July 25, 2011 Report Posted July 25, 2011 I bought some new probes. The 500 Mhz probes work great. Haven't gotten the P5200 up and running yet though.
Kerry Posted July 25, 2011 Report Posted July 25, 2011 Good luck with the HV differential probe. Definitely can come in handy.
digger945 Posted July 25, 2011 Report Posted July 25, 2011 Very nice. I didn't know you had another scope. This is about all I could come up with the other day when you mentioned it.
luvdunhill Posted July 27, 2011 Report Posted July 27, 2011 Yeah, I went through a few. I was tired of the 2.5K record length of the entry Tek scopes and realized I needed to jump to 300Mhz. Here a shot of today's testing
digger945 Posted August 9, 2011 Report Posted August 9, 2011 These all have a reserve, and seeing the seller hails from Beaverton OR, he probably knows about what they are worth. http://shop.ebay.com....m270.l1313#ptm
luvdunhill Posted August 10, 2011 Report Posted August 10, 2011 (edited) The reserve was cheap. Just a FYI, but these require a TEKPROBE compatible scope. The P5200 doesn't. Edited August 10, 2011 by luvdunhill
luvdunhill Posted August 10, 2011 Report Posted August 10, 2011 I wonder how well the electrophoresis power supplies on EBay would work for 'stat amp prototyping? Specs look good, and the price is right, they are dirt cheap. I bet KG would be the perfect person to comment on this...
kevin gilmore Posted August 11, 2011 Report Posted August 11, 2011 (edited) I gave 2 to justin and they work great for this. But you have to be careful which ones to pick. Some go to 3kv. And with those, a mistake can blow up everything. Also these power supplies have protection circuits that measure impedances to ground and also minimum and maximum current levels, so that is an issue. The computer controlled biorad units are sweet. Some units also monitor the special connectors that are plugged into them. Without those cables you might have to jury rig them to get the supplies to turn on. Remember that these things are designed to be used by biology people who have no brains and no respect for something that can generate 300 watts or more at up to 5kv. these are the good ones, i have a few http://cgi.ebay.com/BioRad-PowerPac-3000-Electrophoresis-Power-Supply-/110529882532?pt=LH_DefaultDomain_0&hash=item19bc1829a4 these are pure trash, stay away, lots of different versions of this under different names http://cgi.ebay.com/Life-Technologies-Gibco-Electrophoresis-Power-Supply-/270762844688?pt=LH_DefaultDomain_0&hash=item3f0ab92210 and this http://cgi.ebay.com/ELECTROPHORESIS-POWER-SUPPLY-BIORAD-MODEL-1420B-/310338137420?pt=LH_DefaultDomain_0&hash=item4841982d4c these are hard to fix if they do blow up, but seem pretty reliable http://cgi.ebay.com/LKB-Electrophoresis-Power-Supply-2301-Macrodrive1-/170673614011?pt=LH_DefaultDomain_0&hash=item27bcf0acbb Edited August 12, 2011 by kevin gilmore
livewire Posted August 12, 2011 Report Posted August 12, 2011 A while back while I was repeatedly blowing up my KGSSHV power supply under test, I looked into these electrophoresis psu's rated at 500 volts and was surprised to see how cheap they were. Problem was that I couldnt find the output current specs for the used units on sale, so I didnt pull the trigger. I was also concerned about what KG mentioned above about the protection circuits causing problems with dual rail linking to a common ground.
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