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| eevcandies:
Got a couple of these 400 Watt four-quadrant (source/sink) beastly heavy supplies (so unfortunately, including the one I previously had ,now I have 3 total. At least they are different 400W models). For about $95 each, was hard to resist! What made this impossible to resist, was the 55 pounder shipping was only $30 (I've seen others at shipping cost of $120--$170)...so I was forced to bite. These include the optional RS-232 /488 interface, which allows some form of waveform "programming" (don't yet know any details). Channel Programming resolution is 16-bits, positive and negative. Looks like these guys sold 4 or 5 units recently...there is one left (they seem to be listing one per week): https://www.ebay.com/itm/Electronic-Measurements-Inc-The-BOS-S-Bipolar-Operational-Source-Sink/184372807091?hash=item2aed79c5b3:g:m7EAAOSwODZfGD07 info https://us.lambda.tdk.com/products/legacy-products/pdf/bos-s.pdf A Bipolar Operational Source/Sink power supply that provides a dozen functions in addition to delivering DC voltage and current Four modes of operation: A bipolar power supply, delivering a positive or negative voltage. An operational power supply A sourcing power supply, delivering positive and negative current. More than a dozen functions.DC power supply... Electronic load......Voltage source....Power-pulse generator...Current source...Power-function generator...Direct-coupled amplifier....Variable-gain amplifier...Fast-slewing power supply....DC amplifier...AC power supply...Differential amplifier...Signal-inverting amplifier |
| JonM:
--- Quote from: PaulAm on May 07, 2020, 06:35:42 pm ---I am NOT hauling it out to take a pic of the insides :-DD This thing has something like 110 vacuum tubes. --- End quote --- I have been trying to stay away from this thread but was lured back... In 1980-1983 I was working in a university building built in the 1800's that could get a bit cold when the steam heat was not doing the business. Luckily a Tektronix 555 on its original cart was available to use as an office heater whenever we needed it. It worked quite well for that purpose. |
| Berni:
--- Quote from: eevcandies on August 09, 2020, 02:57:29 am ---Got a couple of these 400 Watt four-quadrant (source/sink) beastly heavy supplies (so unfortunately, including the one I previously had ,now I have 3 total. At least they are different 400W models). For about $95 each, was hard to resist! What made this impossible to resist, was the 55 pounder shipping was only $30 (I've seen others at shipping cost of $120--$170)...so I was forced to bite. These include the optional RS-232 /488 interface, which allows some form of waveform "programming" (don't yet know any details). Channel Programming resolution is 16-bits, positive and negative. --- End quote --- I would have totally picked one up too if the cost of shipping it over to Europe was not so huge. ... Then again i did buy things before where the shipping cost more than the actual item. |
| tchiwam:
HAMEG 20MHz , free, all working, still using it. |
| wkb:
HP 8642a, needs a new battery and the LCD backlight needs new bulbs. It will get white LEDs for obvious reasons. This is the 2nd unit I own. HP8657a, fully functional afaict. The bottom HP PSU I rescued from the scrap, a colleague of mine brought it into the office, it was private property, to have it join our regular scrap removal. Never hit the scrap pallet, straight into my car booth. |
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