EEVblog 1576 - Tektronix DMM916 Multimeter Teardown & (Easy) Repair
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- čas přidán 31. 10. 2023
- Easy repair and teardown of the rather obscure Tektronix DMM916 Multimeter.
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#ElectronicsCreators #tektronix #Multimeter - Věda a technologie
That poor Tektronix DMM916... Some people treat expensive test equipment like a football. 😎 Thank you for the great video. 🥳
I love the style of these old meter designs, personally. The Brymen 85x and Fluke 87 series come to mind. If only they could make meters in this style with the modern amenities - AA battery compartment, fuse access, etc. The plain rectangular chassis just looks nice and professional to me.
I'd love to see a repair-a-thon of these meters!
That switch from outside looks like Brymen. Whole instrument looks like grandad of the BM859s. Plus made in Taiwan. Everything says like it was built by Brymen long time ago.
I always love a good multi-meter tear down. ; )
King of multimeters.
Another DuraLeak Battery. Remember when Duracell was a premium battery? Now they are the worst.
What's a good brand for alkaline?
Lol how dare that battery deform and not leak that was probably manufactured 17 years ago.
@@ortzinatorPKCELL
That’s how business is these days. Ruining good names.
@@ortzinatorEnergizer are ok, they also leak when the voltage gets too low or it's past it's use by date...,
Very nice meter and video Dave!
At 7:56 that chip looks crusty as. I'm surprised you didn't say anything about it
He didn't even bother to clean the contacts under the switch wheel 🤦♂️
@@fffUUUUUU The contacts were fine for the age. Cleaning them wouldn't have achieved anything.
Nice feature rich DMM. Would adorn any workbench with pride!
Tektronix DMM252 is an APPA 105. This DMM916 looks like a modified but related model inside. Credit to retiredcaps and mr.modemhead who wrote about them on EEVblog forum.
I had to sit through two full ads for this? Thanks Dave.
uBlock origin, mate!
Duracell and its patented "Duraleak" technology😂. While I don't use Duracell alkaleaks anymore, I still don't leave them inside my DMM, but wrapped inside a plastic bag in case it leaks. Anyway, great work David.
If you wrap them in a plastic bag, they will know and won't release their juice
We had a Tektronix like this in the UK MoD (Navy) around 98 onwards, but I can't remember if it was the same model.
I still use my 916 all the time.
I bought several of these ~25 years ago. great meters about $180, Fluke did not have anything comparable at ANY price at the time. Tek stopped selling them.
Who else has AC+DC rms, and AC? My guess the same people were involved with both Tek916 and Brymen.
Brymen has similar functions, similar low price.
The probe jack screws were tight when new, with use and cold flow creep the PCB material gave way. Today days these are soldered.
given its age and while i was in there i'd probably have just given all the contact points and banana holes a squirt with some contact cleaner/deoxit just to get it nice and fresh - fun to see the old meters still tanking along though! my cheap one failed dead short after 6 months!
i really like when you call chips as jobbies, i simply love it, it sounds so cute, you give life to these circuits by giving them names, i love ya boi
Pozdrav za kralja 👑multimeter❤👍🏻
Patented AvE voice activated auto focus. 😂
Nice dmm!
iron and airplane is amazing Sir
I bought two of these off eBay a couple years ago, and probably paid way too much for them, just because I love the auto-hold feature so much. I wish that more DMMs offered auto-hold, rather than the normal hold feature where you have to press a button to get it to hold the value, because I never have a hand free to do that when I need it.
Most meters over $50 have that feature. It's pretty common.
@@jonfreeman9682 I've seen lots of meters with a hold function that just locks the current reading on the screen when you press the hold button, but very few that have "auto hold" mode that does not require you to press the button while also making the measurement. Admittedly, I have mostly been looking at lower priced meters. I know, for instance, that both Fluke and Brymen meters have this feature.
@@jsdutky The el cheapo meters include a manual hold but you're right it's not practical without a third hand to push the button though you could reach a finger over. Meters over $50 usually have auto hold feature but frankly it's silly not to include it even in cheap meters because it doesn't cost more to manufacture. There's no extra component cost between auto hold and manual hold. It's just software instruction in the chip that says if the value holds steady for 2 seconds then lock in that value on-screen.
classic eevblog ❤
Dave, the camera work was a bit dodgy 😅....
Best wishes pal...
Enjoy the channel.
I do recall that video from donkeys years ago, and now I'm feeling old 😅
Dave, any suggestions on what type of grease can be used on the selector switch contact without compromising good copper-to-copper connection?
That one has been around the block a few times.
Nice, easy and worthwhile moldymeder repair!
I'm curious as to _why_ the common and volts/ohms/yada jacks are attached with screws and lock washers whereas the current jacks are soldered. Simply for robustness and ease of maintenance?
The current jacks are sensing jacks, so two connections.
I am not sure myself, but from looking at the board, I can see two traces comming off from the current jacks. They might have "input detection" wired to them, which needs two pins per jack, whereas the regular ones are just 1-pin options. And from dim memory, a screwed connection is mechanically more rugged than a solder joint, which would fit good to the most commonly used jacks. Irony in that exactly this was the point of failure of course.
@@atkelar I just went down a bit of a rabbit hole looking at thread lockers. It's a shame the conductive ones aren't more readily available; they would completely obviate the need for this kind of repair.
Hi Dave, I have a tek dmm850 which is quite similar with this one. I used it for years, but now the display is flashing like one in a second. Do you have any suggestions for troubleshooting it?
3:05 Can you do BLUE and STORE at the same time?
I am having an issue with my DMM912. When it boots, the screen flashes with the words "Probe" on it, and threre is a consistent beeping noise. The only thing connected are the red and black probes. How do I go about getting this repaired?
Hey there Dave
Wiggle, wiggle, wiggle, yeeeah! 🤣
One of the chips is very Crute doodles
That looks like being made by APPA taiwan, it even has APPA logo being silk screened on the pcb.
@1:30 what a surprise, a Duracell
SHOCKED!
As a beginner and for sake of curiosity, has this kind of device a built-in reverse polarity protection (against wrongly inserted batteries) ? I just got fooled by these weird chinese aaa batteries that came with my new Uni-T UT60BT and managed to install at least one the wrong way.... On the first power on, no display, no sound. After reinserting correcting the batteries, the unit worked flawlessy (but I didn't test any current). So if multimeters can measure reversed polarities, are they immune to reverse polarity with their own batteries ? Thanks!
Where is my bloody screwdriver?!
May be GW Instek. Tek and now Keithley rebadge GW Instek products.
Multimeter construction screams Brymen to me... even the shape of the plastic case, the rotary switch, and the soft buttons look like my brymen meter I have at home
Are you selling these meters anywhere online?
Watch the video again. He tells where.
There is a persistent rumor in the industry that there are only three manufacturers of DMM ICs: Fortive/Fluke (US), HIOKI (Japan) and an OEM in China. Is this true?
Nope, there are plenty of others.
Maybe only a few that design them but there are way too many that actually manufacture them
Compare the Fuke meters to the Kleins.
that naked trace is gold-plated and I don't know why they did that!
Corrosion resistance
Looks like a nifty meter.
I have a 914
PP3 batteries don't contain AAAA cells, they're a few mm shorter. Urban myth!
Bought one for $25 ;)
inside look like wavetek
What's special about multimeter fuses. Why it's odd size and pricey 😢
Guess they have to be super safe and expected to fail reliably
I have two of these. Nice meters. Your will not get one on eBay for 99 cents.
I think it's made by Escort.
we need to pass a rule that all devices must use rechargeable batteries. tried to use nimh on my meter but it can't handle 3x1.2 well...
You still have options for 2xNi-Mh + 1xNi-Zn, 3xLi-ion DC-DC, 1xNi-Mh 1xdummy 1xLFP or similar cells combinations to try. Maybe 1xLi-ion would work (requires battery compartment modification, probably half of capacity will be usable).
Neitger Ni-Zn nor Li-ion with DC-DC converter don't have a LSD variant (low self discharge, Ni-Zn chemistry does have significant self-discharge, DC-DC converter does always waste power in outher case) so that is an disadvantage.
Li-ion DC-DC or Li-ion with DC-DC are better known under "AA Li-ion 1.5V" or "AAA Li-ion 1.5V" names
Yeah! Nickel Zinc = more voltage (for those who came in late..)
Rated 1.5 -1.6 each I think @@volodumurkalunyak4651 ?
Looks like your new battery expired a few years ago.
DuraLeak at it again.
Blegh.
It's about the time for multimeters to have LCR function, that is, internal signal generator and logging, which is not really difficult to make. Yet those expensive ones don't have it, while it is supposed to be a MULTIMETER. Along with high-resolution full color LCD and USB charging.
battery still connected. Could not help myself from commenting
Ha! I’m the first. ;)
Yet last to get laid
Sorry, the _Spechul Needs_ classroom is next door.
@@johncoops6897 oh, yeah… I’ve felt special when I’ve seen “published 1 second ago”.
Hi hi