HP 34901A PDF

Learn More — opens in a new window or tab. Efficient use of data logging and decision making w multiple scan lists Basic data logging allows you to confi gure different measurements across multiple channels, then record the data. Customs may apply to the item U. Use this configurator to define a switching solution with switches, controllers and accessories. Basic data logging allows you to confi gure different measurements across multiple channels, then record the data.

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The plugins should be in working condition, but the main switch unit was almost "given" with the plugin modules since it is non functional. The knob is nice but it has a rough step when turning it for a complete revolution.

When powered up, however, things are a bit nastier The VFD is, as often with these equipment, very dim and the digits tend to puke on the others. The front panel hold the keyboard, the rotary encoder and the diplay system. The front panel is managed by a 80C51 a 87C51 actually microcontroller.

The communication with the main CPU is a serial line with opamps to adjust the signal levels. I suspected that one of the 2 VFD drivers the one responsible for driving the grids were partially failing, so I ordered a pair of new drivers, as well as some PLCC sockets.

It was my first real smd revork. I though that it might be easier to cut the pins of the soldered chip, but it was not a good idea, I peeled 2 pads on the PCB. Thanksfully, they were not broken.

Lesson learned. I was not sure wether to use the hot air gun or my Weller soldering iron, nor what a correct temperature for the hot air station whould be adequate. The informations on the socket datasheet were not very clear to me. The sockets seemed properly soldered, but in fact, a few pins were not making contact.

So I decided to cut the bottom of the socket which is essentially useless so I can more easily rework these "cold" pins with my soldering iron. Now I had to try to rejuvenate the tungsten filaments. Like for old CRT and even for triodes , the filament, which is responsible for emiting electrons toward the anode coated with phosphor tend to be polluted and loose their emissive power. A common trick to "clean" them is to apply a much higher voltage than rated so they shine for a few seconds.

One mst be careful not to burn them, otherwise the VFD is definitively lost. So I tried such a rejuvenation on my VFD module. I was doing this using my Lambda PSU raising the voltage while looking at the filaments. The results are very disappointing.

The VFD is a little bit brighter, but the spilling over between digits is now much worse I guess this VFD module cannot be saved, after all Indeed, that requires a bit of work: I plan to build an arduino-based adapter using an arduino micor that will take place of the VFD drivers then be fed by the serial-to-shift registers outputs of the 80C One other solution is to replace the 80C51 with a newly programmed one, but I think reverse ingineering the serial communication between the front-panel microcontroller and the main CPU would require much more work.

Meanwhile, next step is to take care of all these errors.


HP / Agilent / Keysight 34901A 20 Channel Multiplexer Module

Taucage Use this model as a reference only. Please feel w to contact us at sales artisantg. Just contact us to make arrangements. Products may be disassembled prior to shipping as appropriate to ensure their safety and minimize shipping costs. Offer AccuSource Electronics is always happy to consider reasonable offers on our test instruments. No additional import charges at delivery!


Keysight / Agilent 34901A 20 Channel Armature Multiplexer



HP / Agilent / Keysight 34901A 20 Channel Multiplexer Module



34901A 20 Channel Multiplexer (2/4-wire) Module for 34970A/34972A


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