EEVblog

Teardown Tuesday.
Inside a 1994 vintage Fluke 91 Series II Scopemeter.
Extended commentary on PCB Wave Soldering: • EEVblog #431 - PCB Wav...
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[@gamccoy]

I own a 92 model with both inputs. I paid about $1500 for it in 1995. The screen has definitely faded over the years -- used to be better but even new, it did not have great contrast. I used it in the field for years and it was a life-saver. It has a special place in my heart, although I rarely even power it up nowadays.

[@hypercomms2001]

Maaaaan, this take me back, as I was as Sales Engineer working for Fluke and Philips in the early '90s....and I remember the very first ScopeMeter at a sales conference at Philips... from memory, this was about 1990/1... this was the very first product that resulted from the Fluke and Philips alliance, that is why your example was made in Holland... it had one problem though... as our sales manager in Sydney found out... it is rugged, but the LCD screen could break, if the ScopeMeter fell on the screen.... memories....sad, Philips did make some good test equipment...

[@rikvdmark]

Michael John Little That explains it being made in The Netherlands. I was suprised. Thank you for clarifying it :)

[@srscricket]

You're the only person I know who is sad over a working scopemeter, nice find.

[@CatchMyThrowingKnife]

Dave you're such a cheerful person it makes your videos so great and enjoyable.

[@Gameboygenius]

The oscilloscope department of Philips was acquired by Fluke in 1992. So I guess this model was manufactured during a transition period when the Philips brand was still in use. See also the comments Dave has responded to above, about the Philips OQ0308T chip and the service manual, which mentions the model name as both Fluke 93/95/97 and Philips PM93/95/97.

[@mikeselectricstuff]

You can use regular BNC plugs on plastic sockets - the contact is on the inner sleeve

[@EEVblog]

Not 50Hz. The intro video segment was shot with the shotgun mic. It picks up the aircon ducting noise in the ceiling from the adjacent offices. Goes up to about 220Hz or so IIRC,

[@maiden7693]

I got an old 97 at work. Actually isn't that bad. Especially the display still looks much better. It's quite handy for measuring some +-5kV peaks from time to time. Even with the standard 800V x10 probes no problem at all. ;)

[@skonkfactory]

Those plastic BNCs work fine with all the passive scope probes I've tried with them.

[@ChipGuy]

Thanks for yet another awesome teardown, Can't get enough of them :)

[@rikvdmark]

Greetings from The Netherlands! Made in Holland?? Had a WTF moment, didn't expect a Fluke product being made somewhere else then in the USA or maybe China. Cool! ^^

[@andyandy7968]

Because it was made by Phillips, not by Fluke. And Phillips is a Netherlands company

[@mikedjames]

The service manual for the Fluke 93,95,97 shows schematics. The PCBs in my 95 I bought on eBay look identical to the 92 you show here. These were designed in the Netherlands by Philips who sold their test equipment business to Fluke. The older series has more buttons on the keypad and simpler single level context sensitive menus and looks quicker to use.

[@edherdman9973]

I thought I saw the Philips logo at the very beginning of the video on a battery cover.

[@EEVblog]

Thanks, that clears a lot of stuff up!

[@amrishhirani6096]

Good protection for ic Good puppy thank you 👍

[@aerofart]

Right on time! Thanks Dave!

[@PA2OLD]

Very strange Dave, the video goes to 8:11 minutes and then it runs further but the minutes counter stops. Nice, from Holland or better, the Netherlands.

[@EEVblog]

Simple ebay search at the right time, or saved keywords search alert if I'm hunting something specific.

[@JAKOB1977]

I love when you stating "your guessed is at good as mine" 15:19 lol' I highly doubt that but thx for the confidence in my guessing.

[@DaViruz]

All BNC jacks are supposed to work like that, there is a sleeve inside the bayonet locking deal that makes the ground connection. The bayonet is only for holding it place, not for electrical connection.

[@hendjoshsr71]

Nice teardown. I used one of these in my school lab for years and had to put up with its terrible interface. It would be cool to see a teardown of a modern scopemeter.

[@fenclu]

Love the blooper at the end....

[@ronniepirtlejr2606]

It seems to be all surface mount not through hole.

[@madmanmaverick]

I still got one somewhere. As for the screen ,, nope it was that rubbish out of the box back in the day. About as much use as a chocolate fire guard. Used it to test optical encoder on steel slab slitting machines, pretty much all it was any use for

[@FamilienSoelberg]

Great video Dave!. The "CLICK HERE For an extended commentary..." annotation point to a private video...

[@EEVblog]

Bummer. Thanks for the confirmation.

[@fingers0287]

on the chips you talk about at 11:51 and 12:38 the asic chips, you said one was for memory and one for display, is that why one says masic (the memory chip) and the other d-asic (the display chip) or is that just a coincidence?

[@supersat]

One thing that I thought was kinda interesting was the PCB pass for the memory ICs. It looks like it's designed to work with ICs in a variety of form factors.

[@muppetpaster]

5:50 for the time it's performance definitely was not "poor" given the portability....

[@fleuroman]

I have a 98b II from ebay... the 74hc74d chip(duel flip flop just below M-ASIC) has been bodged with jump wires, the one that concerns me, pin 11 clock input has been jumped to pin 14 vcc and there's a solder bridge to pin 13(async reset)... I cant find a manual for it either, but the 198 manual says the 12v inputs are for calibration...the boards are separated digital, and analogue with power... the 98 is designed for automotive repair, it even comes with its own simulator, which simulates outputs like o2 (oxygen) sensor, injection pulse, ignition signals, an rpm pickup, high tension ignition lead pickup etc etc...

[@nlhans1990]

Murata filter is probably like BNX002. They can handle quite a lot of current with quite a neat inertion loss.

[@eurokid83]

Dave, I have a 97 Scopemeter and according to the manual the sample rate is 25 million samples-per-second, 40 ns glitch capture. I would imagine the unit you have should be similar.

[@ciasteczkowypotworni]

Oh, my FTP, and more, and more staff :))) I greet Dave :) From Poland :)

[@Jeroenz0r]

yay for Holland

[@NoobsauceLamesauce]

Cool video! My electronics 'mentor' of sorts has one of these (Series 1). It's a pretty fine piece of kit! He just got the latest one (With all the oled-y things) in, you should see if you can get one to tear down from Fluke.

[@kfishy]

Taking a wild guess here, but it looks as if the Phillips quad NAND gates are used as an oscillator for a charge pump, presumably to generate the (negative?) supply for the adjacent opamp. Not sure why it's labelled "RAM POWER LCD SUPPLY"... bias voltage perhaps?

[@RandyLott]

I use the same pens. They're my favorite, haha!

[@clems6989]

BTW, You can use other branded probes on the 97, but be careful that it has the ground ring inside to make contact with the fluke connector...

[@TheInfraredFish]

+Matthew Miller what type of probe does it use?

[@clems6989]

My 97 uses Shielded BNC connectors, The connector on the Fluke 97 has a plastic outer ring so the probe connector must make ground at the inner part I know that sounds funny but.....LOL Wish I had a pic to show...

[@fbonacic]

Hi! I have 97 and rigol 1052, and must say fluke is better with trigger. It catches very steady forms while rigol not ever time. And fluke have less inside noise. In some things it's better then rigol and 20 yrs older! You didn't notice, fluke have long distance washers on screws inside, making screws more elastic and thus more resistent to loosing!

[@treadmillrepair754]

I have one 97 and one 99 and still use every day, I have one 4 channel Rigol still in box, I feel better working with Fluke tools.

[@PhattyMo]

The Phillips "OQ0308T" chip is a custom deal. "ScopeMeter Front End".

[@vaualbus]

And the philips component the service manual says that is a analog asic.

[@MariaEngstrom]

Oh! Now it works! :) Thanks!

[@Deckardsvr]

what a beast !

[@bhartwigutube]

So, I know it is a bit late for me to come to the party, but that 91 is very similar to my 97, which I think is an absolutely brilliant device. My 97 has about 8Mohm resistance from the multi-meter ground to the choke (as you demonstrated)... any thoughts on what might be sideways? Thanks,

[@devilmastah]

Reminds me of a gameboy screen, and those where like that horrible as well, or to dark or to light

[@DIYTAO]

"It's Pretty ancient.." (eek .. I feel old) That extra video seems to be marked Private?

[@MariaEngstrom]

Video of extended commentary on Wave soldering is private. Me no can see. ;(

[@muppetpaster]

I had this from new....

[@davidcochrun5448]

Need some help with a 105b fluke not charging please let me know?

[@hansonsux]

I picked up a 97, and the menus are better than this. Not a super great scope by today's standards, but still holds up well. I liked the fact you can just use my own

[@pyroesp]

How do you find so many stuff on eBay ? I'm kinda jealous of all the "toys" you have Dave !

[@202Electrics]

PCB pr0n when you opened it @ 7:14 !

[@CatchMyThrowingKnife]

Also what are those too holes that you pass your screwdriver over at 12:11

[@amins9240]

I dont fined any data of Voltcraft Dscope 707 Scopemeter,you help me for this set?

[@ducklandwikeno]

how easy it to operate that scope from fluke . Is there a auto function on it too . Just wontering I want to get me a scope soon .

[@nor4277]

It's a hard screen to see stuff on..I wonder what it cost new?anyone ,

[@H4lfr]

Extended commentary on PCB Wave Soldering: -> This video is private.

[@niceguy60]

Dave can you tear down a 125B scopemeter

[@hansonsux]

NiMh batteries of known manufacturer. Third party ready made batteries on Ebay tend to be a crapshoot for cell origin and longevity can be all over the place. It's a shame you can't use your iwn batteries in modern Fluke gear.

[@xmenken1]

Would you repair it and show us the whole procedure in KZbin?

[@SwitchingPower]

I'm also made in Holland

[@Whigu]

Why the battery cover says Philips?

[@1liftman]

Slow as a wet week?

[@AmirHakimiRezaei]

bit of a noob here. what are those blue SMDs

[@MJS1212]

Good

[@megasmart1337]

Cool :)

[@grdv10]

HOLLAND FTW :D

[@DanKalc]

Can u post your oscilloscope schema?

[@thrjygdcmnbfdzfsa]

its the size of your birthday cake :)

[@hansonsux]

I picked up an old 97, and the menus are better than this. Not a super great scope by today's standards, but still holds up well. I liked the fact that I could justbuse my own It's a shame that you cannot use your own batteries in modern Fluke stuff though.

[@muppetpaster]

Made by Philips....

[@vaualbus]

Every time you try to fix somthing it autofix before the video or destroy iy self like the la croy oscilloscope.

[@karthikraj550]

👍👍👍👌👌👌

[@timbdotus]

D-ASIC = Display ASIC & MASIC = Memory ASIC

[@vaualbus]

jsust replace ** with tt

[@SproutyPottedPlant]

I can't believe they sold you a working item, terrible!! Item not as described!

[@MOHAMED-qh3px]

like uuuuuuuuuuuuuuu

[@Narwaro]

Dave is the only one in this world who is disappointed when things work he scored from ebay.

[@garysmith10449]

I'll pay you $100.00 U.S. for your scope meter if it works. No joke.

[@stephenrock4541]

Sort your channel Jones. People are getting robbed. Make a video about it.

[@ducklandwikeno]

sell it to me . I need one .

[@Gameboygenius]

Bloody rippers. They sell an item as defective when it's actually working, and ruin your fun. Shame that such people still exist.

[@stephenrock4541]

I'm an old man and I never win anything

[@stephenrock4541]

Seriously Jones. Checkout telegram. Using your pictures and everything. Please confirm in a video. I've been robbed and I am unhappy.

[@mikedjames]

The service manual for the Fluke 93,95,97 shows schematics. The PCBs in my 95 I bought on eBay look identical to the 92 you show here. These were designed in the Netherlands by Philips who sold their test equipment business to Fluke. The older series has more buttons on the keypad and simpler single level context sensitive menus and looks quicker to use.