Scope day

Phil Hobbs · 2012-06-14T01:57:21+00:00

I ordered two scopes from eBay, a couple of weeks apart, and they botharrived on the same day.#1: Tektronix 11801C 50 GHz sampling scope with SD-24 and SD-26plugins. I rely on my 11802 very heavily, so it makes sense to have aspare, and this was a very good one for very cheap, with a couple ofnice plugins thrown in. #2 Tektronix TDS 694C 3 GHz, 10 Gs/s digital. This is a bit of aFrankenscope--its front panel is obviously from a different model,because it doesn't have the model number badge over the CRT as itshould, and it talks about a 1-M input impedance, which the 694 doesn'thave. (It's 50 ohms, DC coupled only, so I have to use FET probes alot.) Still, it works perfectly and was less than half the price of therefurb ones from fancier dealers.I used the SD-24's TDR generator to test both of them, and they bothwork great--nice bright displays, good triggering, the right rise times,and no issues with passing extended diagnostics.Now to figure out how to explain to the second shift manager why wearen't buying furniture for the next couple of months. ;0CheersPhil Hobbs-- Dr Philip C D HobbsPrincipal ConsultantElectroOptical Innovations LLCOptics, Electro-optics, Photonics, Analog Electronics160 North State Road #203Briarcliff Manor NY 10510845-480-2058hobbs at electrooptical dot net

Jun 14, 2012 68 Replies

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Michael A. Terrell 13 years ago

Especially when you can find an 8M version, cheap. I bought some M25P80-VMW6G on Ebay for 12.85 cents, each

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tm 13 years ago

That's really amazing, isn't it. Back in the day, I paid $10 for a 2102 static ram, 1Kx1 CMOS.

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Michael A. Terrell 13 years ago

A S-100 1KB RAM card was over $1,000 when it first hit the market, and they were bragging about how much better it was than the existing RAM on the CPU card. All 256 bytes.

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JM 13 years ago

Tom,

Are you still looking for this?

I have acquired a (faulty) 11802 with executive processor firmware V10.10 and TBC firmware V10.12. I've just backed up the EPROMs so if you would like copies give me your email address.

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Phil Hobbs 13 years ago

I'd be very interested in copies, if you could send it to the address below.

Thanks

Phil Hobbs

Dr Philip C D Hobbs Principal Consultant ElectroOptical Innovations LLC Optics, Electro-optics, Photonics, Analog Electronics 160 North State Road #203 Briarcliff Manor NY 10510 USA +1 845 480 2058 hobbs at electrooptical dot net http://electrooptical.net

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tm 13 years ago

Sure,

snipped-for-privacy@verizon.net . Can I send them to KO4BB? He keeps a repository of test equipment firmware.

Do you need any help with the 11802?

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John Larkin 13 years ago

What's the error code?

John Larkin Highland Technology Inc www.highlandtechnology.com jlarkin at highlandtechnology dot com Precision electronic instrumentation Picosecond-resolution Digital Delay and Pulse generators Custom timing and laser controllers Photonics and fiberoptic TTL data links VME analog, thermocouple, LVDT, synchro, tachometer Multichannel arbitrary waveform generators

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JM 13 years ago

It had nine errror codes on arrival, I've got it down to one - T2341 (Time base/Strobe/Ref Clock). I'll probably just leave it at that and store it as a donor unit for my working 11802.

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tm 13 years ago

Have you changed out the two battery backed ram chips? You can measure the voltage between pin 14 and 28 and it should be more than 2+ volts. If you need a replacement, I can give you a Mouser part number that works great.

511-M48Z3570PC1

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