Author Topic: HP / Agilent 34401A VFD to LED Display Conversion  (Read 9702 times)

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Offline Cyclotron

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Re: HP / Agilent 34401A VFD to LED Display Conversion
« Reply #100 on: August 23, 2026, 01:11:02 pm »
I note "10A" rather than "01A" there - might be referring to that meter, which has a very different display fitted.

That is the way I read that. I have a 34410a that needs a display.
 

Offline dimmogTopic starter

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Re: HP / Agilent 34401A VFD to LED Display Conversion
« Reply #101 on: August 23, 2026, 06:47:53 pm »
I was curious, thanks.
Tiny, do you load them yourself?

Each LED is a 0201 package, measuring only 0.65 × 0.36 mm.
A package this small is beyond manual assembly. It requires a pick-and-place machine.
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Offline dimmogTopic starter

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Re: HP / Agilent 34401A VFD to LED Display Conversion
« Reply #102 on: August 28, 2026, 03:15:19 am »
Thanks to Dave & Dylan for mentioning our 34401A Dual color LED display!
I bet Dylan will want to do the upgrade once you get the 34401A  :)

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Online BillyO

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Re: HP / Agilent 34401A VFD to LED Display Conversion
« Reply #103 on: August 28, 2026, 03:24:15 am »
I left a positive comment too.  I really will get that upgrade for my 2015 THD once I get the time to do the job.  Got some travel to do in the mean time...
Bill
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Offline dimmogTopic starter

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Re: HP / Agilent 34401A VFD to LED Display Conversion
« Reply #104 on: August 28, 2026, 03:39:06 am »
I left a positive comment too.  I really will get that upgrade for my 2015 THD once I get the time to do the job.  Got some travel to do in the mean time...

Thanks!
When you're ready, just message me. I have a discount available for EEVblog forum members.
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Online BillyO

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Re: HP / Agilent 34401A VFD to LED Display Conversion
« Reply #105 on: August 28, 2026, 03:40:37 am »

Thanks!
When you're ready, just message me. I have a discount available for EEVblog forum members.

Awesome!
Bill
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Offline HairyWombat

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Re: HP / Agilent 34401A VFD to LED Display Conversion
« Reply #106 on: September 01, 2026, 02:53:31 am »
Just got my meter back from being calibrated and while having all meters setup took this shot as a comparison.
2887844-0

The top 34401A has a good bright and even VFD
That 2001 VFD could be better.
Overall the brightness is good and works well with other displays.

Auto phone camera settings so the image is brighter than reality.
« Last Edit: September 01, 2026, 03:13:53 am by HairyWombat »
 
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