Products > Test Equipment

My poor mans SMU - The Agilent 66311B

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gslick:

--- Quote from: SKPang on March 03, 2016, 01:51:58 pm ---The knob has arrived. They shipped it in a massive box.

The unit looks a bit nicer now.  :)

--- End quote ---

You only paid £2.16 + VAT with free delivery for the knob in an antistatic bag in that huge box? How much did they lose on that transaction?  :)

SKPang:
Yes, a total of £2.59 I think the shipping cost is more then that.

Muxr:
I am going to have to 3D print mine since Agilent won't sell me one.

MountainEEV:
Mine just arrived today and appears to be intact.  Powers on without errors but fan is not spinning at all. :--  I have done limited testing so far as I'm waiting for phoenix connectors to arrive.

nctnico:
The 0.05% accuracy spec seems to be driven by the limited voltage setting resolution and probably also the large output current but I wanted to know how stable it is over a longer time period like one hour with a very light load attached. I took two measurements. The first one is at 5V where the measurement is started after the 66311B has been on for 15 minutes, the second measurement is at 500mV and includes the 66311B heating up. The measurement is taken with a 2200uf capacitor across the DVM inputs.

At 5V the variation is less than 165uV:


At 500mV the variation is less than 125uV:


At least the drift doesn't get significantly better or worse with higher or lower output settings. Still I wonder if the temperature drift could be improved by putting a small heater on top of the voltage reference in the 66311B or that the drift is mainly due to temperature dependant offset voltage drift in other components.

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