HEWLETT PACKARD 34401A PDF

Superior performance. The Keysight Technologies, Inc. A multimeter gives you .. From Hewlett-Packard through Agilent to Keysight. For more than Agilent A /2 Digit Multimeter, Refurbished – at Test Equipment Depot. Superior Performance. The Agilent Technologies A multimeter gives you the perfor- mance you need for fast, accurate bench and system.

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Not this time though, no problems detected with a switch, probed input 1.

Following recent trend with Hewlett-Packard equipment repair, welcome new article for more popular bench DMM repair worklog. In this article initial diagnostics, repair attempt and calibration will be covered.

Few photos of calibration steps for better understanding.

HP A front panel removed, front and rear. Repair workflow Image 4: In no event shall the author, xDevs. HP A resistor network U and references test.

Good condition, “X” shaped scratch on helwett right side of the screen, small nick in rubber around the screen.

| HP A repair and calibration worklog

This page was last updated: Number of bids and bid amounts may be slightly out of date. If you like the article or have any questions, jump in comments! NO Options are marked. Up for sale is a used, complete, sold as pictured, no errors, passed self test but will need a new display as there are extra lines and or digits in the display and unit will be sold in working order Final test with 10VDC: This means all electrolytic capacitors must be replaced, no questions asked. These are often a problem on old instruments, if contacts got contamination and unable to maintain low resistance connections.

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Since board does not have RefDes markings around parts, I did highlights on photo to summarize on changed parts during debug and test:. HP A current source for resistance function test. Agilent Keysight A Digital Multimeter 6. That is likely due to absence of fan or vent holes anywhere in the chassis. The display is very bright and even This unit is in greatworking condition.

Hp Agilent Keysight A. Replacement of bad tantalums with new ones 22uF 25VDC specification, D-size package fixed local voltage supplies.

34401A Digital Multimeter, 6½ Digit

Banana input terminal jacks are custom-made parts, with big solid copper tube sockets bent and soldered directly to motherboard. Agilent HP A 6. I had some left from other repairs, so you can see already new caps on photo above. U ASIC resistor network measurement results.

Agilent A Digital Multimeter, 6. HP A front and rear. Layout is tidy and nicely done for this instrument, thumbs up to HP engineers.

Keysight Technologies (Agilent HP) A used or new for sale at used-line

We are located in the heart of the Silicon Valley California. Front panel board REV. Expertly Refurbished by TestEquity.

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Includes all Standard Accessories. HP A Replaced components locations. Redistribution and use of this article or any images or files referenced in it, in source and binary forms, with or without modification, are permitted provided that the following conditions are met:. If you would like to support us by making a donation please click the Paypal button: There were some cases of input protection resistors in size packrd on A, but check revealed no problem with input circuitry as well.

Now thinking about possible cause and overvoltage on this rail, I checked 3. Total man-hours spent on this project around 8 hoursgive or take few.

Now all voltages are fine, but meter still not working, with exactly same test results, wrong DCV readings and failure on any other function. Calibration was referenced to measurement results of my Keithley which was calibrated in February by Tektronix, and is most accurate meter I currently have up to date. Especially considering, that I never had Hewltet before. HP a, what to worry about when buying used?

The serial is SG

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