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| Barbouri:
Latest new to me, 36 year old piece of Hewlett Packard gear. A 8012B Pulse Generator built in 1986. Blog post at: https://www.barbouri.com/2022/05/14/hewlett-packard-8012b-pulse-generator/ |
| TimFox:
--- Quote from: Barbouri on May 15, 2022, 03:38:42 pm ---Latest new to me, 36 year old piece of Hewlett Packard gear. A 8012B Pulse Generator built in 1986. Blog post at: https://www.barbouri.com/2022/05/14/hewlett-packard-8012b-pulse-generator/ --- End quote --- I own one of those and really like it. I had a very strange problem that needed repair. The output stages are switched current sources designed to drive a low impedance, either 50 or 25 ohms, and the calibration on the slide-pots for output voltage has two scales. The internal 50 ohm loads are switched in with a reed relay controlled by the panel switch; the reed relays are DIP units with built-in diodes across the coils, and are constructed so that they can be rotated 180 degrees before insertion and still function, except that that reverses the diode polarity. I noticed bad behavior of that function, and found that indeed the relay was inserted in the wrong rotation. There was no sign on the circuit board of previous repair, so it may have come that way from the factory. With the diode reversed, it "sort-of-maybe-sometimes" worked, since that was well out of spec for the coil. Replacing the relay solved the problem. |
| bingo600:
Been on the hunt for a long time ... Finally /Bingo |
| Cubdriver:
--- Quote from: bingo600 on May 16, 2022, 07:22:37 pm ---Been on the hunt for a long time ... Finally /Bingo --- End quote --- Me <--jealous Nice!!!!! :-+ :-+ :-+ :-+ :-+ -Pat |
| slbender:
--- Quote from: bingo600 on May 16, 2022, 07:22:37 pm ---Been on the hunt for a long time ... Finally /Bingo --- End quote --- I know that feeling…. I had wanted a certain expensive German box (like $50K new) for hmmm. maybe the past 27 years. I finally got it for a price I felt I could afford. Actually Got It! Turned it on. Blank white screen. Burned connector in power supply. OK, better yet - a place in Texas had a full power supply (toroidal transformer, heat sink with regulators, cap board, IEC inlet, and power switch) for the German box, only - they were asking almost as much as I paid for the German box, and “make offer”. As a joke, I sent in an offer of $125., (thinking they would have a big laugh) but a few minutes later, a window appeared on my iPad “Pay It”. The German box still is not working, but disassembled somewhat, soon I hope to find the time to switch in the other power supply to (hopefully) complete its repair? If anyone is guessing as to what the German box is… let me just say it has a few options and it came with the rarely seen “Low Distortion Generator” module. So those two were the deals that made my decade. Steven |
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