[Techtoolslist] Sunday Project: Fluke 9010A Probe

[Jess Askey]

Oh... that is very nice... I was not aware of them.... thanks!!!

-----Original Message-----
From: Techtoolslist [mailto:techtoolslist-bounces at flippers.com] On Behalf Of William Stillwell
Sent: Tuesday, May 17, 2016 11:59 AM
To: Technical Tools Mail List <techtoolslist at flippers.com>
Subject: Re: [Techtoolslist] Sunday Project: Fluke 9010A Probe

Would of been a great project to use the Perf+ Boards:
https://www.crowdsupply.com/ben-wang/perf-2

William Stillwell

Hamster / KI4SWY

Free Play Florida Arcade & Pinball Show Organizer

On Tue, May 17, 2016 at 1:10 PM, Jess Askey <jess at askey.org> wrote:

> (I sent this on Sunday originally, but I think it didn't come through 
> because I sent it from my non-subscribed email address, apologies if 
> you got it twice)
>
> Hey Folks... I thought I would share my Sunday project. I did cheat 
> and pre-order all my parts for today(minus a couple things I wasn't 
> aware of, more details below).
>
> Since the Fluke 9010A probes are hard to come by these days, I figured 
> I would make one... I bought the following..
>
> Pictures are here... http://www.askey.org/fluke_probe/
>
>
> -          15' DB9 Male to Male Serial Cable (I can cut this in two and
> make two probes I figure) - $5, free shipping
>
> -          Old WaveTek slim Logic Probe (I had one, but I bought another
> one of these off ebay for $10)
>
> -          Some old RadShack perf boards that I had laying around
>
> -          About 4 hours of time
>
> Then I did the following... (see pics above)
>
>
> 1.       Cut the perf board down to 5 rows wide, drilled the mounting
> holes. Make sure you have a nice row down the middle for the LED's to 
> line up properly (centered)
>
> 2.       The break-away seam in the 'double' perf board was unfortunately
> right in the middle of where the LED's had to go. So if you can get 
> solid perf board, it would probably work better. I had this laying around.
>
> 3.       Split the Logic Probe, took out the RED and GREEN LED's and the
> tip off the old Logic Probe PCB
>
> 4.       Assembled the circuit using page 142 of the 9010A Service Manual
>
> a.       I had to sub in 1uf caps for the power supply filters (spec was
> .39uf). If you got smaller caps, they would fit better, I had to lie 
> mine down.
>
> b.      I didn't have a 205K 1% Metal Film Resistor, I used a 220K 5% CC
> resistor and I will sub after my next mouser order
>
> c.       I also didn't have a 33pf cap, I used a 47pf from a scrap Firefox
> PCB (don't worry, it was in pretty rough shape anyway)
>
> d.      I added 1.2K resistors on the Cathode side of the LED's since
> these were driven by transistors to 'maybe lamps??'... the schematic 
> says they are lamps, but I have a hard time believing this. In 
> hindsight, these may not be needed at all.
>
> 5.       I used an old clip lead for the ground clip out the back too...
> ironically, both cables seemed to fit pretty nicely out the back of 
> the old Logic Probe case
>
> 6.       I fashioned a 'strain relief' by looping the nylon cable backer
> and crimping and epoxying it. I ended up doing it different from the 
> pic as my loop had to be on the very back logic probe screw post, so 
> it had to be much shorter and the yellow crimp was too big for the 
> space. I just looped the nylon and wrapped it tight with a resistor 
> lead, then dipped the whole thing in 5-minute epoxy and let it harden. Seems pretty solid.
>
> Seems to work fine... the LED's are definitely dim but usable so I 
> will pull those resistors out or lower them appropriately.
>
> Let me know if you have any questions or suggestions... Im going to make
> another one with lessons learned.   :)
>
> PS - I cleaned my bench spotless on Friday night after eating a bunch 
> of edible pot (I live in Colorado :) so I can tell you this).... It 
> didn't look right.. but... luckily, after this project,  it is now 
> back to looking 'normal'...whew!!
>
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