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Oscilloscopes


mypasswordis

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  • 2 weeks later...

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.

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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 :palm:

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.

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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.

TEK_547_-_2.jpg

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 by Craig Sawyers
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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.

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  • 1 month later...

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 :)

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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 by luvdunhill
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  • 4 months later...
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  • 2 weeks later...

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 by kevin gilmore
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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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