seriously dumb question 'bout Tek scopes...

Dec 26, 2005 7 Replies

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Paul Burridge 20 years ago

Hi all,

I recently bought a 4-channel Tek 350Mhz scope which purportedly has 2

50 ohm inputs. But I can only find 4 high-Z inputs (the usual 1M ||
15pF) according to the front panel. How do I switch to 50 ohms - assuming I can at all? Or have I been shafted?? p.

"What is now proved was once only imagin\'d" - William Blake

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Hal Murray 20 years ago

What's the model number?

I'd expect a switch on the front panel. It might be hidden away in a GUI where you have to search for it.

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John Fields 20 years ago

If you got a 2245, look under, and a little to the right of, the two "VOLTS/DIV" rotary switches on the front panel and you\'ll find two pushbutton switches. Push the bottom one until the legend to its left reads "50 ohms DC".

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Joerg 20 years ago

Hello Paul,

There would be a switch really close to the BNC jacks. If there ain't then you could buy a few of those 50ohm 'BNC barrels'. IIRC Pomona makes those in the US but I wouldn't know who does in Europe.

Regards, Joerg

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Paul Burridge 20 years ago

Okay, thanks chaps! Got it.

"What is now proved was once only imagin\'d" - William Blake

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meow2222 20 years ago

The questions that keep a person dumb are the ones not asked.

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John Crighton 20 years ago

Hello Paul, which model/type number did you buy? Just interested.

The yahoo Tekscope group is very good for help with repairs.

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People there are well mannered, no slagging or politics on that group like there is on this one. :-) Just Tekscopes nothing else.

Regards, John Crighton Sydney

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Paul Burridge 20 years ago

Thanks for the pointer, John. It's a 2465A, actually. In quite good nick, too. I also bought a classic 475 that looks like it's done very little work as well (although the trace is a shade noisy but I've come across a web page that details how to fix that problem). Plus I *also* bought a 3rd scope which I might post a picture of *if* I'm feeling resilient enough to absorb all the abuse I'll get from having acquired such a noteworthy specimen. ;-)

"What is now proved was once only imagin\'d" - William Blake

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