@@Thesignalpath Of course, and I am actually glad that you didn’t have to put much effort into this one. I know how frustrating it is to track down a fault for hours while trying to record the whole process.
What a great buy! This had to be some corporate meter, where the moment it stopped working the user just returned it to the stockroom and got out another without ever even looking for possible simple problems.
Yeah totally! The user might have even detected the problem but wanted to have a brand new one so he asked for it and this one went to the discard pile…
Looks a bit like the previous owner broke the battery contact right after getting the device calibrated. 😂But why didn't he just stuff some balled up aluminum foil into the gap tho? 🤔
That's exactly what I did when my second hand Fluke 189 battery spring broke. Previous owner had some alkaline cells leak in there which weakened the spring.
It's important! Previous owner has installed 11A fuse in the place of 400ma. 789 should have both fuses rated to 440mA. I suggest you to replace fuse ASAP
Very helpful, thank you. I was watching this video specifically to find out what fuses were supposed to be in it. When I didn't see it in the video, I started looking through the comments. Thanks!
Thanks for the great video as always! But this is nowhere near what qualifies as a "really dirty" for a Fluke - I've seen some things... horrible things...
@@Thesignalpath All I can say is that I tried it with a newer 87V and it instantly bricked. Gotta hand it to Fluke, I sent it back and they replaced the board. Lesson Learned.
@@Thesignalpath The root cause for the meter dying when measuring its own battery is that the COM jack in most multimeters is not connected to battery ground, but instead an analog ground at another potential, so when the COM lead is connected to the battery this shorts out the analog ground, most likely killing the ASIC chip, or if you are lucky just the voltage regulators. This is similar to hooking up a grounded mains oscilloscope ground clip to an arbitrary voltage source, things go *boom*
My wife did design work on the 789 so she got to keep one. She watched this vid and accused me of blowing it up while I was troubleshooting a microwave oven that I burned popcorn in. I don't believe it was the 789 that I blew up. I blew up one of her other meters.
1:29 exacly same problem of my fluke 187 i bougt at a Hamfest as broken for less then 50 euro ... still working great ..another problem with these series is that the connectors brake loose from the board when using std banana plugs.
I noticed the fuse also. I popped one of the two fuses in my 89 IV. Different meter, but each fuse is different and they fit their respective holder well. That one fuse looks longer that the space provided by the holder. Not like Fluke to be sloppy about spacing. Nice find!
The Fluke 789 PrceossMeter I have used and watched interment tech in setting up Industrial valve's controllers, level indicators, flow meters, pressure indictors large industrial fans controllers. a process signal is 4 to 20 ma. The signal can run vary long distances (500m or 1640') and be very accurate and immune to electrical noise almost all industry uses this setup. In valves and controllers, the 4 to 20 ma is converted to a air signal of 3 to 15 psi. I work with industrial boiler and cogeneration for 42 yr.
Same reason why most car collectors buy up crappy cars and fix them up. The only way to practice diagnosing and fixing an issue in a complex system like a modern electronic device or a car, is to find examples with issues and attempt to fix them.
In my experience it’s really rare that a Fuke meter goes out of cal, they usually hold very well for decades. We went to a 3 year metrology span for some of them 6 months was just throwing money away…
@@GeorgeGraves you're the dense one, George. I take it you think sectional drawings and exploded views are useless too. Go away if you're going to stoop to personal insults over something as inconsequential as the thumbnail of the video.
It is clearly meant for the thumbnail to provide some insight to what is in the video. You may ignore the thumbnail or the whole video for that matter. But what you are not allowed to do is to throw insults around. There is enough of that in the online world as it is.
Oh no! Yet another connection issue. 🙂I was hyped for a detailed circuit investigation.
Thanks for this comment would have wasted my time on this one getting exited again
I don't control what is broken - it is the luck of the draw.
@@Thesignalpath Of course, and I am actually glad that you didn’t have to put much effort into this one. I know how frustrating it is to track down a fault for hours while trying to record the whole process.
Damn you’ve got luck don’t you. If I bought that it would have been totally fried, lol
What a great buy! This had to be some corporate meter, where the moment it stopped working the user just returned it to the stockroom and got out another without ever even looking for possible simple problems.
Yeah totally! The user might have even detected the problem but wanted to have a brand new one so he asked for it and this one went to the discard pile…
I have one of these in my backpack, and use it almost every day. congrats :)
Hahaha, your repair are more mechanical in nature. Nice score!
The fluke is rock solid accurate!
You couldn't ask more out of it than that!👍
Looks a bit like the previous owner broke the battery contact right after getting the device calibrated. 😂But why didn't he just stuff some balled up aluminum foil into the gap tho? 🤔
That's exactly what I did when my second hand Fluke 189 battery spring broke. Previous owner had some alkaline cells leak in there which weakened the spring.
That's my default bodge.
It's like pokemon. Gotta catch (save) them all :D
And we got our entertainment for today :D
Thank you so much
Absolutely accurate, I wouldn't have expect anything other from a Fluke.
Wow, what a meter.
It's important! Previous owner has installed 11A fuse in the place of 400ma. 789 should have both fuses rated to 440mA. I suggest you to replace fuse ASAP
I’ll change it. Thanks!
Very helpful, thank you. I was watching this video specifically to find out what fuses were supposed to be in it. When I didn't see it in the video, I started looking through the comments. Thanks!
I was figuring a more difficult repair , oh well ;)
Good for you
Thanks again
Hola, excelente vídeo, me puedes ayudar con el valor del transistor q20.
Thanks for the great video as always!
But this is nowhere near what qualifies as a "really dirty" for a Fluke - I've seen some things... horrible things...
Haha… :)
If you want to immediately brick one of these meters, attempt to measure the units own batteries.
Did you try it?
Is this a known issue? What is the root cause?
@@Thesignalpath That goes for any fluke meter
@@Thesignalpath All I can say is that I tried it with a newer 87V and it instantly bricked. Gotta hand it to Fluke, I sent it back and they replaced the board. Lesson Learned.
@@Thesignalpath The root cause for the meter dying when measuring its own battery is that the COM jack in most multimeters is not connected to battery ground, but instead an analog ground at another potential, so when the COM lead is connected to the battery this shorts out the analog ground, most likely killing the ASIC chip, or if you are lucky just the voltage regulators. This is similar to hooking up a grounded mains oscilloscope ground clip to an arbitrary voltage source, things go *boom*
My wife did design work on the 789 so she got to keep one. She watched this vid and accused me of blowing it up while I was troubleshooting a microwave oven that I burned popcorn in. I don't believe it was the 789 that I blew up. I blew up one of her other meters.
Dang, Shahriar. I need your eBay luck. One might even call it a... fluke. 🤓
Great find! You'd think that the owner of the meter would know enough to see the contact was broken.
i woulda used some foil lol
Nice!
1:29 exacly same problem of my fluke 187 i bougt at a Hamfest as broken for less then 50 euro ... still working great ..another problem with these series is that the connectors brake loose from the board when using std banana plugs.
Good work!
It does that because the instrument standard is 4-20mA
Nice repair, try to apply silicon from inside to seal the battery holder, so if any battery leak it didn't damage the pcb.
Silicone is not a very good idea with metal. A good polymer sealant will work better and is safe to use on metals.
What kind of A/D they use ?
One of the fuses being halfway out of the holder was really triggering my ocd ;).
I fixed it. :)
The other fuse is the wrong size (physically, too long). Not really safe...
I’ll change it. Thanks!
$190, not too bad.
"shoes diode voltage drop" ?!?!
Short circuit voltage drop?
@@Thesignalpath Spec sheet you showed at 0m22s says this phrase opposite 'Diode Test'. Doesn't anyone proofread these things?!
Haha...
it was fun.
What's going on with the fuse holder?
nothing wrong, the fuse is just sitting a bit too high. Maybe the meter got bumped or dropped...
I noticed the fuse also. I popped one of the two fuses in my 89 IV. Different meter, but each fuse is different and they fit their respective holder well. That one fuse looks longer that the space provided by the holder. Not like Fluke to be sloppy about spacing. Nice find!
The Fluke 789 PrceossMeter I have used and watched interment tech in setting up Industrial valve's controllers, level indicators, flow meters, pressure indictors large industrial fans controllers. a process signal is 4 to 20 ma. The signal can run vary long distances (500m or 1640') and be very accurate and immune to electrical noise almost all industry uses this setup. In valves and controllers, the 4 to 20 ma is converted to a air signal of 3 to 15 psi. I work with industrial boiler and cogeneration for 42 yr.
I was wondering why are you buying such meters when you already have an arsenal of great instruments for every possible scenario you can imagine?
Because it enables me to make videos like this about its operation & repair.
Same reason why most car collectors buy up crappy cars and fix them up. The only way to practice diagnosing and fixing an issue in a complex system like a modern electronic device or a car, is to find examples with issues and attempt to fix them.
There is no such thing as “too many” instruments, and that goes especially for Fluke
In my experience it’s really rare that a Fuke meter goes out of cal, they usually hold very well for decades. We went to a 3 year metrology span for some of them 6 months was just throwing money away…
$1200 non-working, geeeeee.
The photoshoping the screen is an odd trend. Now sure why people insist on doing that - but please stop it.
Why? It allows me to show something about its internal without obscuring the instrument.
@@Thesignalpath IN a thumbnail? When you're going to open the meter anyways? You can't be that dense.
@@GeorgeGraves you're the dense one, George. I take it you think sectional drawings and exploded views are useless too. Go away if you're going to stoop to personal insults over something as inconsequential as the thumbnail of the video.
It is clearly meant for the thumbnail to provide some insight to what is in the video. You may ignore the thumbnail or the whole video for that matter. But what you are not allowed to do is to throw insults around. There is enough of that in the online world as it is.
@@Thesignalpath Woah - slow down there - I was trying to be helpful- letting you know that the thumbnail is cringe. But you do you broski.
Best, Fluke