Fluke 341/343 change sheet for LED indicators - Page 1
Forum section: electronics / repair

author: HalFoster
author_rank: Frequent Contributor
timestamp: March 23, 2021, 10:45:49 am
content: All:Does anyone have the documentation for the change from lamps to LED indicators for the Fluke 341/343 DC standards? The latest manual that I can find does not cover this modification.TIA,Hal

author: oz2cpu
author_rank: Frequent Contributor
timestamp: March 27, 2022, 10:47:57 am
content: did you solve this ?`DS4, DS5, DS6, DS7 are 24V bulbs in the manualbut many units allready have LED in the 3 range indicators, like mine hada normal 5mm LED will fit fine, just add 3k6 series resistor to a 202x age LED, and you see plenty of light..i changed the 3 range dots to green, seems more logical to me.the on-indicator is more likely bulbs, the hole in the metal tube fitted back side is impossible to remove, please dont try,but here a 3mm led fit fine, again add 3k6 and a new age 3mm red led, here you cant change the color due to the colored transparent difuserjust let the 240 R series resistors for the bulbs sit where they are,this way you modify as little as possible.by the way : genius design with series resistors for bulbs, peak currents will be much less,and bulb lifetime will be long.

author: HalFoster
author_rank: Frequent Contributor
timestamp: March 29, 2022, 04:10:26 pm
content: Been a while - haven't looked at it since due to other priorities - but from what I remember mine did not have any lamps at all - it is a later version with the LEDs and i don't have an accurate schematic. Other things were changed as well and the voltages did not match up and, since it didn't work, I was trying to figure out if that was by design or a symptom.Hal

author: HalFoster
author_rank: Frequent Contributor
timestamp: March 29, 2022, 04:14:53 pm
content: Also, the only manual that i am able to find is the one dated 1969 - that is why I was hoping that there would be an updated version or at least change sheets available.Hal

author: oz2cpu
author_rank: Frequent Contributor
timestamp: March 29, 2022, 07:28:49 pm
content: please post info about the model you got ?we love picturesI am far from an expert, but I see a few different models

author: HalFoster
author_rank: Frequent Contributor
timestamp: March 29, 2022, 10:45:05 pm
content: Would but I would have to find it. The "priorities" have involved building and moving into a new house - and having to buy a 16x52 shed just for the TE. I do know where it is, but am not going to dig it out until I am ready to work on it - concentrating on getting a usable work area done so I can sort through and *sell* some of that big pile 'o JENGA.

author: HalFoster
author_rank: Frequent Contributor
timestamp: March 29, 2022, 11:01:32 pm
content: oz2cpu -To be clear, I'm not blowing you off re the pictures, it sounds like you have one that you are trying to get sorted as well and I would love to compare notes and get both of them working at 100% but it really isn't convenient to get to mine at the moment and I'm in the middle of bringing several 3335A's up to spec. Not to mention that Idon'tknow exactly where my previous repair notes on it areAnd, of course, there's always that pesky real job that I kinda have to pay attention to if I want things like houses, a wonderful wife's patience and pretty TE to play with. Ten shades of suck for me, I know...Hal

author: oz2cpu
author_rank: Frequent Contributor
timestamp: March 30, 2022, 07:49:20 am
content: no worries mate, you just come back, when you got time and energy for that one,we all do the same, every project has its time :-)