Hp Agilent Keysight 34401a VFD replacement at 30$ usd each

[coromonadalix]

Just to let you know  EEvblog members

Bought 2 of them here : 

https://www.aliexpress.com/item/1PC-Repalcement-NEW-for-HP-AGILENT-34401A-Display-VFD-vacuum-Fluorescence-Display/32963797699.html?spm=a2g0s.9042311.0.0.3da24c4di7RsBF

Very well priced at 30$ usd, very bright (with the windows bezel removed and cleaned up)  no missing sections.  Took 35 days to receive them in Canada.

The only replacement from Keysight with the pcb included for a mere 200$ usd   and they dont have many stock left .... 

I saw many vfd substitutes of them higher priced on Fleabay.


When you power the meter, keep the shift key pressed, it will light all the display segments ... and do the self tests after you release the shift key

[NoisyBoy]

After reading a number of inconsistent quality of replacement Chinese VFDs, it is nice for you to share a source to get a good VFD.  It would be great if you can take some pictures to share it with the community.

It certainly is a lot cheaper to just replace the dim display (especially for the older 34401A on Rev 1 display boards), than the entire display front end. 

One of my 34401A was getting inconsistent segment brightness due to burn-in in 5 digit mode.  In my case, I keep all my equipment fully Keysight/Agilent original, so I called up my Keysight rep and ordered a display front end under my Keysight account, it was $150 if I recall correctly.  The new board is Rev 3.

But it is always nice to know that there is an alternative, thanks for sharing. 

BTW, if I don't want to deal with warm-up and had to do a number of measurements scattered over a long period of time, now I just turn the display off when I am not using it.

Just to let you know  EEvblog members

Bought 2 of them here : 

https://www.aliexpress.com/item/1PC-Repalcement-NEW-for-HP-AGILENT-34401A-Display-VFD-vacuum-Fluorescence-Display/32963797699.html?spm=a2g0s.9042311.0.0.3da24c4di7RsBF

Very well priced at 30$ usd, very bright (with the windows bezel removed and cleaned up)  no missing sections.  Took 35 days to receive them in Canada.

The only replacement from Keysight with the pcb included for a mere 200$ usd   and they dont have many stock left .... 

I saw many vfd substitutes of them higher priced on Fleabay.


When you power the meter, keep the shift key pressed, it will light all the display segments ... and do the self tests after you release the shift key

[NoisyBoy]

BTW, are your units the same as pictured?  I noticed it is the Japanese itron with the circular/needle pin with the black insulation..They were used many years ago in the Agilent Made in the U.S.A. display front-end, before Agilent switched to the Samsung VFD and moved manufacturing to Malaysia

It would be a very good buy if what you get is the original itron parts.

[coromonadalix]

i'll send some photos this week   while i hold the shift key   and the back of the vfd, i saw some markings

They are not itron marked,   nor samsung

[Cubdriver]

Thanks for the tip!

-Pat

[coromonadalix]

here ya go,   the pins are at least  3/4 inch long,  the overall glass thickness is 0.5 mm thicker than the original vfd  ...  the white sticker has been partially thorn,  it came like this

markings :

zejhiang feida

fd33-1201  135*23*37

[NoisyBoy]

Thank you so much for the excellent pictures, it will be most helpful for the community.  I have seen so many old 34401A with barely visible displays out there, those owners can really benefit from it.  Do you happen to have one of it powered up as well?

Thanks for sharing.

here ya go,   the pins are at least  3/4 inch long,  the overall glass thickness is 0.5 mm thicker than the original vfd  ...  the white sticker has been partially thorn,  it came like this

markings :

zejhiang feida

fd33-1201  135*23*37

[artag]

Are there any other common VFDs available ? I'd love to get hold of a Keithley 2000 and an HP53131A VFD

[4thDoctorWhoFan]

Are there any other common VFDs available ? I'd love to get hold of a Keithley 2000 and an HP53131A VFD

It would also be great to get some replacement VFD's for the Fluke 8840A & 8842A displays.

[coromonadalix]

for the powered one photos  i'll post them in 1-2 days   i'm not at home until the weekend



I have my old original hp Agilent vfd at 50% of brightness left,    if someone want it, ill give it  free        just pay the shipping   

[coromonadalix]

here ya go,  room slightly dark

The windows bezel need to be polished, but ill loose the company markings ??

[NoisyBoy]

Hey thanks, looks good, all segments are evenly lit, much better than some replacement VFD pictures I saw before. 

The brand is the same as some of the eBay seller I saw before, but the price is definitely better.

Enjoy your meter, thanks for sharing.

here ya go,  room slightly dark

The windows bezel need to be polished, but ill loose the company markings ??