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Old 8th March 2014, 01:50 PM   #21
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Join Date: May 2011
Location: Clifton, Maine
I think you will have fabricate your own cables. I can provide specific help in PM if you wish.

But this should get you started. The 600 ohm load you refer to is Part # HP11095a and is available on the big auction site. It has bnc male/female connectors on each end. At that same site you can pick up a variety of connectors like a "dual banana to bnc female". A cheaper alternative to the HP11095a load would be to use a 600 ohm metal film resister mounted to set screws in one of the above mentioned connectors.

The display on your oscilloscope should be a near perfect sine wave. How do you have this connected? If all you have is a regular oscope probe then you can just use short piece of stiff wire in the HP339 Oscillator output connector. Or use a (dual banana to bnc) and a (bnc to bnc) cable to connect to your oscope.
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Old 8th March 2014, 03:19 PM   #22
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Join Date: Mar 2011
Location: Columbia, SC
Actually further investigation: I get a clean sine wave at 1volt like you show but my .3 and .1 are completely dead. 30 mv is OK and 10mv and 3mv are extremely fuzzy and look like a triangular fuzzy signal.

What does your 10mv and 3mv look like? are they fuzzy also? The amp I would like to check has considerable gain and I'd like to check it with 10mv and 3mv.

BTW your 339a looks a lot better than mine. I have a 2215a scope similar to the one you have. Thanks for the info on the connectors.
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Old 8th March 2014, 03:22 PM   #23
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Join Date: Mar 2011
Location: Columbia, SC
Can you post a link to " the big auction site" you reference?
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Old 8th March 2014, 11:32 PM   #24
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Join Date: Mar 2011
Location: Columbia, SC
Terry, can you bee more specific on the decals. I would like to do some lettering myself. You mentioned also dry rub on lettering as well.
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Old 10th March 2014, 03:48 PM   #25
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Join Date: Jul 2011
What I used was
Testors Testors Modeling Tools & Accessories Decals Decal Paper - Clear & White

but if you Google "Inkjet Prinatble Decal Paper" you will get tons of options. Basically, it is a sheet of clear paper that can be run through an inkjet printer (there are versions that work in laser printers too) so you can print whatever you want. Then a clear spray is applied over the printing to protect it. After that dries, you cut out the decal and soak it in water for a couple of seconds and that releases the paper backing, leaving a clear decal with the printing on it. You then slide this off the paper and onto whatever you want to apply it to.
As I said in my post, I did this because one of the knobs on my 339 was really messed up. The previous owner had tried to repair the knob and had gotten epoxy all over the back side of it and destroyed most of the lettering (which is on the back side of the knobs). So I sanded the back side completely smooth and then used finer and finer grades of emery paper until it was clear again. I finished with a plastic polish like you can get for automobile headlights or motorcycle windscreens. Then I printed the new numbers on the decal, but since I was placing the decal on the back side of the knob, I printed it in reverse. You can use any program you like to make the numbers. I just used Microsoft Word.
If your knobs are not in such terrible shape, then I would not use this method. One of my other knobs was had a few of the numbers missing because the black paint used for the lettering had be chipped away. To fix that, I used some black paint and carefully applied it with a toothpick. It didn't look too good, but after it dried a bit, I went back with a very sharp exacto knife and cleaned up the edges. A good magnifier is helpful for that.

They also make a dry transfer type of paper that lets you rub the letters off onto a panel :
Dry rub off decal paper - YouTube
Inkjet Rub-on decal paper transfer paper.
I haven't tried that.

Terry
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Old 10th March 2014, 04:55 PM   #26
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Join Date: Jul 2011
Here is a dry transfer that leaves no carrier. Just the ink.

Custom DRY TRANSFERS and no-carrier DECALS in 5 minutes with "DecalPRO"

Again, I haven't tried this one, but they show an example of replacing all the lettering on an electronic equipment panel. It looks pretty nice.

Terry
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Old 10th March 2014, 08:14 PM   #27
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Join Date: Mar 2011
Location: Columbia, SC
Neat stuff. What I've been trying to do was put white letters on an aircraft instrument panel. This seems like it should work dandy.

What tool did you use to reverse the image?
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Old 10th March 2014, 08:32 PM   #28
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I just used the option on the printer driver to reverse the image.

Terry
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Old 10th March 2014, 08:43 PM   #29
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Location: Columbia, SC
I've got to buy a priner. Which one do you have? My lasers don't have that option.
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Old 10th March 2014, 09:03 PM   #30
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I have an HP all in one (printer, fax, copier) model K-60. It is pretty old. I think most printers will have the option to 'mirror image'. Even the laser here at work does.

Terry
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