Products > Test Equipment
My poor mans SMU - The Agilent 66311B
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HighVoltage:
The front and inside look very similar to the 6612C, just without the front binding post.
And the 6612C is much much more expensive.

Thanks for sharing the 66311B, I was not aware of this model.
michaeliv:

--- Quote from: TheSteve on February 12, 2016, 06:22:48 am ---[...] and can sink 0-15 volts at up to 2 amps. It also has the expected CV and CC modes [...]

--- End quote ---
Manual says that it doesn't have CC sink capabilities. How does the sink feature actually work ? Does it actually display the real voltage when sinking ?
gslick:

--- Quote from: michaeliv on February 12, 2016, 04:49:10 pm ---
--- Quote from: TheSteve on February 12, 2016, 06:22:48 am ---[...] and can sink 0-15 volts at up to 2 amps. It also has the expected CV and CC modes [...]

--- End quote ---
Manual says that it doesn't have CC sink capabilities. How does the sink feature actually work ? Does it actually display the real voltage when sinking ?

--- End quote ---

I just tried this with a 66309D with its output 1 connected to the output of a 6632B (0-20V, 0-5A). When the 6632B is programmed for a higher output voltage than the 66309D the 66309D will sink as much current as it is capable of doing while displaying the measured voltage at its output and the measured current that it is sinking. As long as the programmed current limit of the 6632B is within the current sinking capability of the 66309D the 6632B will be in CC mode and the voltage measured and displayed by both the 66309D the 6632B will be very close to the voltage programmed into the 66309D.

Figure 2-1. Dc Source Output 1 Characteristic in the manual shows the current sinking capability of approximately 2.8A at a programmed voltage of 0 volts dropping to a current sinking capability of approximately 1.2A at 15 volts. With the 66309D programmed for 0 volts I didn't see the UNR indicator turn on until the 6632B was set for closer to 3A, and when with the 66309D programmed for 15 volts I didn't see the UNR indicator turn on until the 6632B was set for closer to 1.6A. I didn't want to experiment too much with the 66309D current beyond the ranges specified in the manual.

In contrast the negative current sinking setting of the 6632B is programmable as the same setting as the positive current sourcing.

Agilent Part No. 5964-8125
USER’S GUIDE
Agilent Model 66111A
Fast Transient DC Source
Agilent Model 66311B/D, 66309B/D
Mobile Communications DC Source

Output 1 Characteristic

Figure 2-1 also shows a single range ? two quadrant capability. This means that the dc source is capable
of sourcing as well as sinking current over the output voltage range from zero volts to the rated voltage.
This negative current sinking capability provides fast downprogramming of the output of the dc source. It
can also be used to sink current from a battery charger, thus providing battery charger test capability. The
negative current is not programmable, and varies linearly from approximately 1.2 amperes at the full
rated voltage, to approximately 2.8 amperes at zero output voltage.

NOTE: If you attempt to operate the dc source beyond its output ratings, the output of the unit
may become unregulated. This is indicated by the UNR annunciator on the front panel.
The output may also become unregulated if the ac line voltage drops below the minimum
rating specified in Appendix A.
ve7xen:
Pulled the trigger on a $55 offer that was accepted. Thanks for the heads up!

Definitely want to do the front-panel binding posts mod, if my unit works. Anyone know of a good quality suitable type for this?
nctnico:
$55 seems to be the magic number the seller is looking for indeed. I bought one as well  :palm:
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