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- เผยแพร่เมื่อ 18 ก.พ. 2013
- Teardown Tuesday.
Inside the HP 3457A 6.5/7.5 digit bench multimeter.
Service Manual:
cp.literature.agilent.com/litw...
cp.literature.agilent.com/litw...
f6fzk.free.fr/DOCUMENTATION/DO...
User Manual: cp.literature.agilent.com/litw...
LM399 Reference: cds.linear.com/docs/en/datashe...
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1) It is handy to verify my other gear so I can produce precision products like the uCurrent.
2) You can't keep Kangaroo's as pets, you can't build a fence high enough, they will jump clean over your whole house in a single leap. I keep some Drop Bears in a tree out the back instead. Much better pets.
The HP part numbers were called 4x4's, though they're up to 5x5's now. Sometimes they are off the shelf, other times they are hand-selected or manufactured to custom specifications.
1826-1382 IC PRECISION OP AMP 8-DlP·P PKG LT1001CN8(SELECTED)
1826-1265 IC-WIDEBAND OP·AMP (LT318AN8 SELECTED) SL30028
1826-0346 IC-DUAL GEN-PURPOSE OP AMP 8 -DIP · P PKG LM358N
1826-0521 IC-DUAL LOW·BIAS-H·IMPO OP AMP TL072CP
1820-2624 IC·MPU; CLK FRE0=2MHZ, ENHANCED 6800 MC68B09P
It's 0:30 AM in Slovenia, when sudenly: EEVBlog pops up! Oh well.... Education beats need for sleep!
5am and 11 years later here in the UK, your sentiment still rings true!
What a beauty! Hats off to you for getting one....at last ;-)
Great video, nice to see you back at the hardcore of what teardowns should be!! I'm buying one fo these now :-) Cheers Dave!
Браво на Дейв за огромния му труд. Юнака е чел, чел, чел.
That is really cool that you pointed out why it did not have a fan. I did not know that and I have used calibration equipment before.
Dave reminds me of the techs i worked with at AT&T. One was nick named Wild Man, he was just like this, full of energy and he was a good tech.
For some reason the warning label "care should be taken to prevent this from occurring" was quite amusing to me. I guess when you have a lot of space for your warnings, you write long warnings.
Thanks!
Analog Device parts inside a multimeter used at production line of Analog Devide chips! INCEPTION!
We have a few of these at work, controlling the voltage sent to our voltpacks (variable xfmrs). 480V in, 200kV out. Pretty neat devices.
Whoops. Hit "enter" too soon. The temperature compensated voltage reference "1826-1249-5" cross references to Linear Technologies "LM399H".
I goofed that one a bit. Yes, it only has one screw, but the metal shielding plate underneath has integral standoffs that provide more support than what it looks like.
looking forward to a review! and comparative analysis
It also attracts dust when you have a fan. You do not want to open an instrument with a fan after 20 or 30 odd years!
Briljant review, thanx 4 sharing!
Cool zener reference unit... always wondered how that stuff worked.
Yes, screw holes on the side.
Good point. I need to consider the "glass half full" perspective.
I have one, which has inputs on the rear too. If a scanner is installed, the rear inputs are removed. It looks like your one has had a scanner at some point, but then removed, which is why you have a big hole in the back. A video about using it would be good. I believe it is possible to get the extra digit on the front panel with a bit of fiddling around. I think it gets stored in a register.
Dave! You're an electronic detective!
Dave, love this video!
One question, does taking apart all these shields and pulling off those hybrids carry any risk in messing with any of the calibration setups or all those basically stored in the KAM?
Cooling fan in Agilent 3458A and 34410A !!!! Dave !!!!
Dave ,i am just selling off the old business stuff i have .Would love to do a lot of test and measurement reviews specific to India Products .This kind of gear does not sell on ebay india nor other website ,Its just auctioned .The review you did for this multimeter is more then enough for us to appreciate the fact that this 6.5 digit multimeter is kick ass reference for other multimeters to test against .I just started to sort out my messy lab ;-) . This device is built like a tank .Excellent
The processor is a 68B09, a 2MHz NMOS version of the 6809.
all those ic pins from 1986 still look better than a brand new Yehah iron
you got to love HP stuff :)
Well, yes -- you're introducing *moist* warm air. However, both of those variables are also entirely variable if you have forced air cooling going through there.
Conceptually: imagine breathing near the air intake.
The slotted optocouplers can handle higher voltages! You are correct!
So I have a pinball machine at home, I have almost as much fun looking at the electronics in it as I do playing it
Hi Dave, there is a list of HP equivalent p/n's as used in test gear. I've got the pdf.... somewhere, but Goo-girl might prove quicker.
Just their own internal convenience most likely. Otherwise they would not publish them, nor leave manufacturer branding on them.
The part 1820-3174 according to the schamtics is u502 and it is a nand port.
ahah perfect timing Dave, i was bored
Nice vid, and nice meter. Scary that that calibration screw is connected to input high, while the shielding is connected to input low. Sure looks pretty close together, with little room for shifting around. what CAT rating would that be? Hmmmm?
The reference is the LM399
Linear makes 2 voltages references with internal heater, the LM399, mostly used for 6.5 digit multimeters like the Agilent 34401A, its a 4 pin device.
The other one is more exciting, the LTZ1000, used in the agilent 8.5 digit multimeter I think. VERY low tempco of just 0.05PPM, not percentage, PPM!, that's a shocking 50 parts pet billion. As the reference in here looks like a 4 pin device it probably is the LM399. If you can measure 6.95V somewhere you know for sure.
The production date of hp-devices is encoded into its serial number. The serial number scheme is: YYWWCsssss
Add the first two digits to 1960 and you get the year of production. The third and fourth number is the production week. The Letter C is the manufacturing country: A = America, B = Brazil, G = Germany, J = Japan, S = Singapore, M = Malaysia or Indonesia and Q = United Kingdom
Your 3457A has the serial 2703A11838 - so it's likely to be produced in the 3'rd week of 1987.
Carsten Ellwart I have one of these, and it's serial number is 2703A04231. Unless HP was building 7000+ of these a week there must be some further complication to the serial number scheme.
+Vernon Klukas : Hi Vernon, I have a late production unit with s/n 3114Axxxxx. With the usual HP s/n interpretation method this would lead to think the unit was manufactured in 1991. However most of the chips inside are dated late 1994. The board manufacturing labele is 09-9447, or 47th week 1994. The backup battery is the new 3.4V japanese Lithium cell, which is found in boards with ERC no. 2850 and greater. The unit has CALNUM=120 and appears to have been calibrated last by Agilent in 2004. Best regards. Len
On some HP kit, the serial number date is that of major design revision, not of manufacture.
It seems pretty likely this was used in Analog's Wilmington, MA wafer fab site.
The HP 3457A was released in 1986 according to an HP Journal article (can't link it).
An electronic stuff such this one... from HP O_0... my life just changed, seriously.
Dave has S/N=2703A11838, one of mine is 2703A11436......pretty close!
Interestingly, the opto isolators on my analogue board are DIP package type........
I have a vintage HP power supply 25V, 25A maximum, but it has a blown thyristor/simistor on the board... all the parts are HP part numbers and i can't fix it.... I'll make a video of it and send it to you as a video response. You'd love the large analog amp and voltage needle meters :) I'd love a hp part catalogue...
Wouldn't surprise me. I also have a complete Lindgren RF screening room with the copper sheet flooring. Any takers?
Хочу себе такой
karn dave.. make the how it works video... uber cooool
Another piece of equipment gets harder to buy, as the E-bay prices rise due to the "Dave Effect!!"
I have an idea: you could charge people for an advanced notice that you find good deals on model xxx, then the subscribers could buy them before the video comes out, and the price goes up.
If you don't need the math and the extra digit, the 3478A is just as good.
Thanks for that review. Bought one. Came from Ericsson. As new condition. Question: Did you replace the AC input plug? Think the x and y caps are Rifas...
Rgds/Christer (from Sweden).
Cold beer && 3457A teardown == nerd heaven:) I am under the impression that Dave blowing had more impact on leakage (breath moisture) than thermal gradiance?
Why is it that all of a sudden there are long lines of empty cans of soda, redbull, coffee items etc etc on my desk whenever I come to this channel? lolololol
hey Dave i have a EDC MV-100 do you know of a site that i can find the info on this thing as to schematics ect and what would you think the difference between the MV-100 and the MV-106 that you have i know the outside looks the same but what about the inside as to what it can do
Do you think they use the custom numbers to try to prevent reverse engineering? Or do they just do it for their own convenience?
Hello, please make a video on how to operate this multimeter. Thanks a lot.
I ran across a doc from 1984 with a big cross reference list of HP house numbers including many of the ones in this unit. Anyone interested can plug "hparchive com HP-Bench-Briefs-1984-05-06" into google to find it since youtube doesn't like links.
Spoiler: the 1820-3174 chip with the ferrite plate is an 74HC132 according to that doc.
Well, if the whole board flexes from the vibration, wouldn't that put tension on the packages?
google, first hit for service manual, not hard!
Just Google for a sort of "converter list" from HP-numbers to 'standard'-numbers - I found one on the "datasheetarchive" and you'll have all your chpis "decoded" ;-))
Have Curious Marc check the specific HP labeled chips in the analog board! He will know.
Is breathing over the circuit an accurate test tho? More than just warm air is introduced!
I think you can find common house number cross references easily by just googling them. 1820-3174 cross references to 74HC132
Made in the uk baby!!! :)
It should have the rear terminals.
Do you use some method to find chip equipment on ebay.
When I search for something I cannot find nothingh!.
Ah the days when I was surrounded by lab-grade TMDE in the Corps. I miss playing with the good stuff on the government's dime. We had a veritable heap of gear like this.
lol, i have a couple of pet kangaroos. they are not fenced, as dave all ready pointed out, there is no point.
i too have a couple of drop bears so we never walk under trees at night, the sheep took a while to learn this
I bet that the Motorola processor used in this box is the 68000 or some variant.
I wonder if there are any easter eggs in the ROM chip
The funny "1826-1382" cross references to a Linear Technologies "LT1001CN8" precision op-amp.
If one had to change the Li cell, what are the exact steps to do so correctly, while maintaining original config data with unit "On" ?
You would want to clip in an external 3v supply across the connection points of the old battery, with a OR diode or even just a resistor, then swap the old battery.
22:00 How come you've got a British plug in the background?
Not to mention transfer of dust!
I wonder if that Motorola processor is a 68000 being at 8Mhz?
Do some of those chips by the handwriting have an allen bradley logo on them? That would be strange.
+codenamecody
1810 - 0307 NET WORK·CNDCT MODULE DIP 16 PIN 0.100 01121 316X101
MFR code 01121 = ALLEN-BRADLEY CO. INC. EL PASO TX 79935
Why is that weird?
They do industrial controls now. I didn't know that they made integrated circuits at one point in time.
Its a resistor network
Hmm, I have a pair of 3458A in storage. Was going to sell them...
36:20 Funny curved trace on the left side
I got extremely lucky, paid 470 Swedish crowns for mine, that's about 57 aussie dollars.
GBP 100
wouldn't it better to have a fan inside a sealed case in order to reduce thermal hotspots?
Umm, you just have those lying in storage?? They are worth about $5K each or something!
so if you had a fence 20 m tall, it will jump clean over? Thats some kick ass kangaroos you got in your area
150 AUD in 2013.... 600 USD in 2020 ;)
Nope, none at all.
These meters are quite robust in terms of drift vs physical handing and environment. If they weren't, then they would not be usable after shipping to and from a cal lab etc.
he should sell his show as a tv show on iTunes
My popcorns just run away and hid under the kitchen counter!! :(
yes this unit Dave effected :) 400 USD on E-bay hehe :) Dave, we cannot do reverse? We type some number, you make fake blamm review then we buy? we will share 50% of savings with You :))) just a joke.
1820-3174 = MC74HC132N
Dhl are scrubs
no ups is
Welp, I'm just going to go to sle-- NOPE
I wanna pet a kangaroo qq
@reps kkk
Cooling fan in Agilent 3458A and 34410A !!!! Dave !!!!