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The underside of the board has some giant copper traces, and a large portion has the silkscreen removed and has been tinned. A couple days later I had a new rotary encoder ready to be installed. The picture above is the new encoder from Agilent. It does have two speeds loud-ish and louder? Other than that there are a lot of passive components and a MOV soldered on near the output. This is actually towards the front of the power supply making it a little awkward to pick up.

Finally on the other side where the PCB is the tab routed in the board needs to be lifted gently with a small screwdriver until it clears the white plastic tab.

Repair of an Agilent EA DC Power Supply – William Breidenthal

Rent From Transcat Do you need a test instrument for a short time? The over voltage features as well as the programmability of the supply both checkout out as well. Would you like this item calibrated? It is also the same encoder used in many different Agilent products. Now to actually get it installed. New Purchase Calibration Learn More Save time and money by calibrating your new instrument before it leaves our warehouse, ensuring it arrives ready to be put into service.


The new encoder worked perfectly and made the supply work like new. Because the encoder snaps into place I had to cut the two large legs off of the old encoder before I could comfortably remove it from the board. Request a Rental Quote. I also made sure to order a new knob to replace to old grungy one to complete my work on the supply. This product is available for shipping to United States and Canada only.

By making it simple to connect, control instruments, and automate test sequences you can quickly move past the test development phase and access results faster than ever before with just a few clicks. In my case the encoder would miss steps or sometimes step in the wrong direction. I recently bought a used Agilent power supply in a very sad condition. After cleaning the grime off the front panel and removing the marker from the case I coerced the E into running a self test which it passed without hesitation.

Agilent E3640A DC Power Supply 30 Day

Accredited Calibration without Data. After doing a little research I found that it e640a a known issue for the rotary encoders in these power supplies to fail. The whole board will then slide over to the agilfnt in this picture and is easily pulled out. This lead me to believe that the only issue with this power supply was that the rotary encoder was on its last legs.


The front panel is easily separated from the main body of the power supply. After the knob is pulled off the front the dark cover needs to be removed.

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Request a Calibration Quote. Keysight BenchVue software for the PC eliminates many of the issues around bench testing. Accredited Calibration with Data.

Since the repair I have been using the power supply for a little over a week and I have had no issues whatsoever, and I am very happy how it turned out. After it is loose the cover tilts forward and is easily removed. After removing a couple of screws the whole inside of the power supply slides out the front. Request a Calibration Quote Transcat can calibrate your existing instruments.

If you forget to remove these the PCB on the other aiglent will not be able to be removed. Fortunately Agilent has an online shop that supplies many wear-and-tear items for their various products. E3640w are three clips along the top which can be accessed from the inside.

The fan towards the center draws air in from the sides of the supply and pushed is loudly out the back. Don’t forget the Software!