Products > Test Equipment
My poor mans SMU - The Agilent 66311B
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nctnico:
For who still wants one: it seems the seller has another 18 pieces for sale
http://www.ebay.com/itm/HP-Agilent-Keysight-66311B-Mobile-Communications-DC-Source-/272149540406
macboy:

--- Quote from: ve7xen on February 28, 2016, 05:58:23 am ---So I've done some additional testing/calibration, and my box does great as a power supply, well within spec per the verification procedure after calibration. However the current sink seems to have failed short. Though this would seem to short across the output rails, so perhaps it is part of the control circuitry for the 'downprogrammer' that's the problem.

In trying to track this down I'm finding this is by far the worst piece of HP test equipment to work on I've ever seen. All the component designators are hidden under the components, many of the test points called out in the service manual are unreachable with normal probes, and no schematic or component placement diagram seems to be available. It looks like I'm going to have to remove the A1 board to do further testing, which is also a much more arduous chore than most HP gear.

Ah well, at least it makes a great power supply if nothing else.

--- End quote ---
Keep in mind that while it can sink current, it is not programmable. The current sink will be around 1 to 2.5 A (depending on voltage at output terminals), regardless of programmed current limit.
amc184:

--- Quote ---Keep in mind that while it can sink current, it is not programmable. The current sink will be around 1 to 2.5 A (depending on voltage at output terminals), regardless of programmed current limit.
--- End quote ---

Damn, that's pretty disappointing.

I've been following this thread after I bought a similar instrument from Keithley, the 2304A.  The 2304A's current sinking is programmable, you can set it for, say, 0V, 10mA, and it will act as a 10mA load (max sink is 3A).  They're such similar devices that I'd assumed they had the same features.  Those who are after a low power, high accuracy programmable load (a don't mind a rubbish user interface), keep the 2304A in mind, they sometimes go cheap.
gslick:

--- Quote from: amc184 on February 29, 2016, 05:14:26 am ---
--- Quote ---Keep in mind that while it can sink current, it is not programmable. The current sink will be around 1 to 2.5 A (depending on voltage at output terminals), regardless of programmed current limit.
--- End quote ---

Damn, that's pretty disappointing.

I've been following this thread after I bought a similar instrument from Keithley, the 2304A.  The 2304A's current sinking is programmable, you can set it for, say, 0V, 10mA, and it will act as a 10mA load (max sink is 3A).  They're such similar devices that I'd assumed they had the same features.  Those who are after a low power, high accuracy programmable load (a don't mind a rubbish user interface), keep the 2304A in mind, they sometimes go cheap.

--- End quote ---

There are other HP/Agilent supplies which are programmable for the current sink level. For example the 6632B which is 20V / 5A, where the current sink level isn't separately programmable from the current source level, the sink level matches the programmed source level. Yes it's too bad the 66309/66311 do not also have that feature.
stuartk:
So it seems that Keysight Canada has a minimum $50 order.   :(
I'm not certain what shipping is

The parts I need are:

Feet: 5041-8801 $19 CAD (I'm assuming that it contains 4 feet, not 1 foot although you never know) The fellow at Keysight told me he didn't know if it was 1 foot or 4 feet as the parts don't show up on their system. He said it's an Agilent product and referred me to Agilent who said that it's a Keysight device and part and they don't sell parts.... |O

Knob:33120-87401 $3.67

Is anyone coordinating a group buy to get over the minimum?

I'm certainly happy to pay for a share of the order + shipping + handling + pain and suffering

Stuart
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