Products > Test Equipment

My poor mans SMU - The Agilent 66311B

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mtdoc:

--- Quote from: Selectech on February 24, 2016, 03:51:24 am ---My unit arrived today. No knob, but blue tape on the side said it was working -- and it is working. Bright, even display, checked some current & voltage settings. Control buttons all work ok.

--- End quote ---

Yeah, mine had one of the pieces of blue tape as well.  Worked right away - no jumper change to 120V needed.
I haven't had a chance to check the accuracy yet.

stuartk:
I received mine also today. Display at 80% brightness, no knob but otherwise cosmetically OK. Minor scuffing of the display.

It had a blue sticker on it that said working and it worked out of the box fine. The fan is noisy though.

I think I'm going to call Keysight for a set of feet and a knob.

Any suggestions for where to get a new 2410ML-04W  fan? They seem pretty pricey.

Anyone have leads on binding posts that fit into the front of the unit?

Stuart

macboy:

--- Quote from: stuartk on February 25, 2016, 02:56:28 am ---...I think I'm going to call Keysight for a set of feet and a knob.
...
Anyone have leads on binding posts that fit into the front of the unit?

Stuart

--- End quote ---
Maybe people here would be interested in a group buy for the knob and possibly feet. That would avoid minimum order issues and probably reduce shipping costs (even after mailing out to individuals).

As for the front panel holes, those are for BNC plugs such as used with the 33120A arb generator:

As you can see, the layout of the front panel including buttons is identical. I'm not saying you won't find binding posts that fit, but I don't think they were designed for them.

Mine arrived yesterday, through the Global shipping program. It was in rough condition. The PCB of the display board was dislodged, so the buttons were all recessed and impossible to push. The display lens was very scuffed, almost like someone cleaned it with fine sandpaper, there was a large 8"x10" patch of sticker residue on the top. And the inside is completely caked with brown dust. You can't see anything through it. Just brown PCBs. Yuck. I dismantled the front panel and cleaned the switch membrane and plastics with soap and water. I removed and polished the lens the best I could (not bad). A citrus cleaner removed the giant patch of sticker residue, then IPA removed the citrus oil. I removed some dust but the rest will have to wait, that is a big job. The VFD is showing some age with slightly dimmed segments, but overall it is fine. No knob. It is HP branded, not Agilent like mtdoc's lucky score. Mine was labelled as working and it is. The output is within 0.1%. Mine did not come with the output connector, but did have the INH/FLT connector, which I re-purposed to the output (it is only 4 position, so no ground connection).

nctnico:
I have attached some 2.5mm^2 silicone leads with 4mm banana sockets to the rear plug. Front posts would be nice but to do it right you'd also want the sense connections on the front. Perhaps even a switch to select between local and remote sensing. The current is quite low to small posts would be sufficient.

stuartk:
I have an SMD unit manufactured in 2003. Some of the older ones are through hole construction. Much of the PCB is un-populated, presumably for better models.

I opened mine up and cleared out a small spider web near the fan and dust over the fan and heat sink. I blew some crap out of it, fan is less noisy now.

I reconfigured the transformer lugs for 120 VAC operation.

There are only 2 post spots on the front panel, so to run both output and sense it would require 2 female BNC connectors as macboy is suggesting, instead of banana posts which would only give output.

I took a cursory look at the power PCB without removing the top and I didn't see any place to connect the outputs. It would require removing the PCB and soldering to the bottom of it.

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