The Poor mans SMU PART 2 - The Agilent 66319D

[stuartk]

Following our collective testing of the 66311B, I picked up a few 66319D's at a local auction by complete fluke.

The 66319D dual output power supply is the top dog of the Mobile DC source line capable of:

• +15 3A output on channel 1
• +12v 1.5A output on channel 2
• -2A sink capability on channel 1
•  Built in additional digital voltmeter for checking voltage anywhere in your circuit
• Programmable output resistance of -40 Milli-ohms to +1.0000 Ohms on channel 1 to simulate the internal resistance of a battery. Yes not a typo, you can set the resistance to 0.0015 Ohms or 1.5 Milli-ohms for example. As I will show in later posts it becomes useful in the sinking function.

It is a 2 quadrant unit capable of sourcing positive output voltage on channel 1 and 2, as well as sinking input on channel 1. This for example allows you to supply output power to your DUT using channel 2 and simulate the main battery of your DUT being charged, by sinking current on channel 1, all at the same time.

Keysight Data Sheet is available at the top of this web page:
http://www.keysight.com/en/pd-1000000819%3Aepsg%3Apro-pn-66319D/dual-mobile-comm-dc-source-battery-emulation-dvm?cc=US&lc=eng

I've been playing around with them all weekend and found them very stable and robust. The damn thing is built like a tank to an obvious very high quality standard.

Please see the attached teardown photo's for your viewing pleasure. I was only able to remove the case and take some limited pics. I did not remove the circuit boards or connectors for more in depth photo's as I have put these units up for sale and don't wish to damage them.

The first photo is a 66311B for comparison


followed by a 66319D overview shot.


Then note the 66319D extra PCB board. Note the main PCB is now fully populated.



Picture of the 66319D transformer


and a 0.25 Ohm resistor.


Suspect the extra board is for the programmable resistance function



Board common to all the models

Enjoy,

Stuart

[nidlaX]

Nice one! Do you know what firmware revisions are installed in your units? Also, is that a red X mark on the wide flex cable leading to the interface board?

I'm planning on replacing my fan with a San Ace 60 9S type for quieter operation. Hopefully a reduction in airflow from 26 to 20 CFM is still thermally acceptable...

[nctnico]

Seem like both models use the same PCB layout but with optional components.

[stuartk]

Pretty much similar internals with added components.
I think the red marking is some sort of blotch or marking from whoever assembled it.

Here is the ROM version:


Here is my test setup. In this picture, the DP832A is set to output a CC of +1A and the 66319D has it's internal resistance set to 500 Milli-ohms sinking the 1 amp, resulting in surprise surprise a voltage of 0.5 volts!


I used this silent Vantec fan purchased from Newegg, seems to work fine even after 20 min of full load.

[TheSteve]

Thanks for the pics. An amazing amount of hardware inside these things. If you get a chance please dump the firmware.
I still use my 66311B all the time.

[stuartk]

Hi Steve, yep they are really good units.

Here are some more pics:

66319D Output channel 1 at 15v no load


Output channel 2 at 12v no load


Output at 3A full load channel 1 (fan going at full bore)

[stuartk]

Some more pictures of the 66319D:

Here is a shot of the auxiliary 3rd channel DVM in action:


Setting the current range to 20mA:


Driving a small LED at 1.8v:


You can see the LED at the top of the picture:

[stuartk]

And lastly, the sinking function on channel 1. To use it, set the voltage to zero volts on channel 1 and then turn the output on.

If you keep the resistance at zero, it will sink up to -3A prior to the protect function engaging. Setting the resistance to its maximum at 1 ohm, it will sink up to -2A

Sinking 3A at o ohms:


Setting resistance to 0.2000 ohms 


0.6 volts as expected


Sinking 1 amp at 0.5000 ohms gives 0.5 volts as expected


Sinking 1.5A at 1ohm again demonstrates ohms law


Well that's it for me,

Cheers to all,

Stuart