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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Disclaimer 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: HP A Replaced components locations.

U ASIC resistor network measurement results. Banana input terminal jacks are custom-made parts, with big solid copper hew,ett sockets bent and soldered directly to motherboard.

NO Options are marked. These are often a problem on old instruments, if contacts got contamination and unable to maintain low resistance connections. And yes, some were dead short, packafd some were missing, likely due previous owner repair attempts.

This is one of best connections, and look really clean. Includes all Standard Accessories. As you may already guess, all resistances were fine. Expertly Refurbished by TestEquity. HP A Zero calibration with 4W short. Agilent A Multimeter — Product overview. Removed front panel, to get easier access to mainboard. Also shop in Also shop in. After calibration, values are compared to Keithley meter to ensure they agree on readings. We are located in the heart of the Silicon Valley California. That is likely due to absence of fan or vent holes anywhere in the hewleft.


This unit has been tested and is fully functional. Shift registers on AC circuitry and few other opamps were replaced as well, but that was actually unnecessary. July 19,6: All feedback is valued at xDevs.

Top Dog Test is corporate friendly we understand the traditional acquisition and capital approval process. HP a, what to worry about when buying used? Hp Agilent Keysight Ehwlett. Calibration was referenced to measurement results of my Keithley hewoett was calibrated in February by Tektronix, and is most accurate 344401a I currently have up to date Few photos of calibration steps for better understanding.

Bad parts from meter. I did not have SOT packaged type, so used leaded ones instead. Agilent A Refine Results. Meter does power on, VFD screen lit up and keypad working normally. HP A front panel removed, front and rear.

Packafd A Digital Multimeter, 6. This page was last updated: I had some left from other repairs, so you can see already new caps on photo above. First step — zero calibration with 4W short. ROR does not apply to rental orders.

In this article initial diagnostics, repair attempt and calibration will be covered. LM is socketed, just like more recent xA instruments.

Showing Results for Keysight Technologies (Agilent HP) 34401A

This part is used and was removed in working condition. Overall signal path is rather simple to read on board, even without reference to service manual or schematics. Following recent trend with Hewlett-Packard equipment repair, welcome new article for more popular bench DMM repair worklog.


If you like the article or have hwelett questions, jump in comments! Again, it was tested and works fine! Cause for this was again bad tantalum capacitors, C, C, C, C Furthermore, we also buy, trade, repair, rent and broker. HP A front and rear. In no event shall the author, xDevs. No function impact anyway.

Now thinking about possible cause and overvoltage on this rail, I checked 3.

| HP A repair and calibration worklog

In good working condition with minor wear. As usual, every repair should start from local power supply diagnostics and debug. Good condition, “X” shaped scratch on the right side of the screen, small nick in rubber around the screen. Now all voltages are fine, but meter still not working, with exactly same test results, wrong DCV readings and failure on any other function.

U multiplexer 74HC was replaced as well, but issue was same.

Since board does not have RefDes markings around parts, I did highlights on photo to summarize on changed parts during debug and test: