Products > Test Equipment

My poor mans SMU - The Agilent 66311B

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TheSteve:
OK, perhaps it isn't really an SMU, its certainly not 4 quadrant, but its still darn cool for the price. The Agilent 66311B Mobile Communication DC Source supplies 0 - 15 volts at up to 3 amps and can sink 0-15 volts at up to 2 amps. It also has the expected CV and CC modes, OVP, OCP, output on/off and lots of other goodies including serial and GPIB interfaces. There is some very nice software for it that I don't even want to know the price of. It looks pretty unassuming but is 18 inches deep and weighs over 9 kilos(20 pounds). Programming accuracy is 0.05% + 10mV for voltage and 0.05% + 1.33 mA for current. DC measurement accuracy is 0.03% + 5mV - the current spec are pretty darn good as well. The data sheet on the whole series can be found here:
http://www.keysight.com/upload/cmc_upload/All/66300series_datasheet_Jan07.pdf

I picked this unit off ebay for a best offer of 55 USD (and 35 for fedex ground shipping) in the usual "has errors, not working etc" state. When I received it I powered it up and it randomly gave me every error documented in the service manual. At first I thought maybe something was loose as errors are not generally that random. Then I had better look at it and noticed it said 220 VAC on the back. A read through a service note indicated they are all shipped for 220 VAC operation but can be jumpered to 120 VAC etc. Sure enough it was jumpered to 220 VAC. To configure it for 120 VAC it requires an extra jumper. Agilent was nice enough to provide the spare jumper - it is connected to unused lugs on the transformer. Once reconfigured it powered up without error and is working perfectly. The calibration looks great - everything checks out bang on with my new 34461A. The build quality looks very nice inside, Agilent didn't cheap out at all. It uses a connector on the back for power out and has sense lines to compensate for voltage drop. There is also a version with front mounted banana jacks - a quick look at the front panel shows the plastic is molded to accept two banana jacks so mine will likely get modified with a pair pretty quick. I'll jumper the sense line to the jacks which should be good enough for my use.

The seller has more of them, no idea if some have real faults or if they are all simply configured for 220 VAC.  I have NO connection to the seller, I just like what I got for 90 USD shipped.  # 281926297815 for those who want to try their luck - maybe someone can get them to accept an even lower best offer.

TiN:
That's some real transformer beef. How about more detailed PCB shots?

TheSteve:

--- Quote from: TiN on February 12, 2016, 06:28:56 am ---That's some real transformer beef. How about more detailed PCB shots?

--- End quote ---

Absolutely!

TheSteve:
more pics

TheSteve:
And the transformer which has a total of 20 spade lugs coming out of it.

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