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Test Equipment Anonymous (TEA) group therapy thread

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bd139:
Yeah it was the car that did me in too originally. Was perfectly healthy until I got one.

Specmaster:

--- Quote from: bd139 on May 28, 2018, 12:53:11 pm ---Yeah it was the car that did me in too originally. Was perfectly healthy until I got one.

--- End quote ---
Snap

From mobile device so predictive text might have struck again [emoji83]

med6753:

--- Quote from: Specmaster on May 27, 2018, 03:32:17 pm ---
--- Quote from: med6753 on May 27, 2018, 02:52:40 pm ---
--- Quote from: Specmaster on May 27, 2018, 11:24:13 am ---bd139, I do indeed have the blue one, its a IG-4505 and she is in all of her original splendor the modification made was to remove the pre-attached BNC lead with the 50 \$\Omega\$ termination resistor with a BNC socket for more flexibility and of course easier storage when not in use as the lead always got in the way. I have made up a special lead with the 50 \$\Omega\$ resistor built in to retain the 50 \$\Omega\$ connection if required.

I have also recapped and cleaned it and thoroughly checked it over and tweaked the calibration to bring the output voltages up and now she is bang the money. Now of course having seen that IG-4244 of med6753 I want one as well. Not too sure which is the earlier one but I'm kinda guessing its not mine as if the numbering system went in chronological order, mine is the newer of the two.


--- End quote ---
The IG-4244 was introduced in 1984. Your IG-4505 dates much earlier than that, back into the early to mid 1970's. I think they were available concurrently, at least for a while, but I would have to check the catalogs to verify that.

The IG-4244 also has the special 50 ohm terminated coax for the "Time" output for scopes with 1MEG input impedance. Since my two 2465's have a 50 ohm input available I can use a standard RG-58 patch cable and it's properly terminated. 

I don't have time today but tomorrow I'll pull it down off the shelf and take some pron shots of the insides. I have to dexoit the range switch anyway...it's getting a little dodgy.

--- End quote ---
Thanks for putting me right on that, all it does is make even more determined to get one like yours  >:D
I'd love to see the naked view of it please, I need more porn  :-DD
I agree with the 1M input, most newer scopes come with 1M these days, hence why I made a up a 50 \$\Omega\$ lead so if I need to have 50 \$\Omega\$ for a particular scope, I have the lead ready for it  :-+

EDIT Just found this excellent site where a person has built one from a kit documented it as they went.

http://www.pestingers.net/pages-images/heathkit/test-equipment/ig4244/ig4244.htm

--- End quote ---

That kit must have cost him a fortune. Unbuilt Heathkits sell at a very high premium.

Here's my naked. Somewhat older and a little dusty.

bd139:
Typical neat Heathkit design. Looks like same enclosure as their frequency counters.

Thanks for posting :)

Mr. Scram:

--- Quote from: bd139 on May 28, 2018, 12:53:11 pm ---Yeah it was the car that did me in too originally. Was perfectly healthy until I got one.

--- End quote ---
Well, I guess they fixed that. The things are too bloody expensive to actually drive nowadays.

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