You know what I love about your channel? you go beyond what is labeled as "entertainment" in todays world. You can explain things in a way that makes sense and keeps the audience engaged, even if its math (which I super appreciate since nobody does these things anymore). Ive written many comments like this before but, man, i really fucking love your channel.

Great video! I have a lot of old meters, but not much knowledge. I'm amazed at how such a simple device can be so complicated for my. 57 year old brain. But the good news is that it's still possible to acquire these meters for cheap, with patience... Cheers from Utah!

Wow love that you have the knowledge to reuse all this amazing stuff. I wonder if we could show to new generations to reuse more than buy new things.

@fullwaverecked

3 жыл бұрын

The less the new generation knows, the better... ;)

As an electrical engineer, this was really satisfying to watch! Keep up the good work!

I'm loving the quality of this video. Very well presented, well done!

This something I sincerely have wanted to do for a long time and now I have the basis for tackling it! thanks.

You read my mind. When you were doing all of those calculations I was thinking, just put a pot on the meter.

I've just converted a 1A school laboratory meter into a 40V meter for my bench power supply.... Thanks for the help!

Good job explaining everything! Looking forward to the next one! Thanks!

At your worst you are really good but this time you are great. Your analysis, diagramming and derivations are a wonder to behold. Be well, Do good work, Keep in touch.

Great instruction! I have a bunch of these old meters laying around that I have plans to convert, but I've been unsure about how those shunt resistors work. Great idea with the trimpots setup. Thanks from an awesome channel :)

Love this. Can't wait to see the rest of this series.

Excellent analysis. Your highlighting this possibility will save many cool old analog meters from the scrap heap. I love meters like this and routinely use several.

Very nice. Just a master explanation. Thank you so much!

thanks for sharing such valuable information

thanks for posting this. you did a great job explaining things!

@TPAI Nice video! I love old analogue meters. Thumbs up.

love it. thanks for the movie. looking forward to the next one

I liked the idea of having a large value and lower value variable resistor in series, having them both at max then winding the wick down on the large value one first, then the lower values :) I'm planning on building a volt meter clock after my current project, so gonna use that idea to fine tune the needle position :D

@EvenTheDogAgrees

7 жыл бұрын

I honestly forgot how I determined mine... Probably some crude way, like "this thing is rated for 50VDC, and my Arduino pumps out 5VDC, so I need to multiply this resistor value with 10" or something along those lines. I really need to build myself one of those decade resistance substitution boxes.

very much enjoyed, thanks for uploading !

Just thought I mention. I have a bunch of aircraft coll dials that this IMMENSELY helped with. If you don't want to go with a lab power supply, you can buy a Cypress POSC5 microcontroller kit for $10. The processor has FPGA like blocks and an Analog subsystem with both a DAC (0-1.024v, 0-4.096V) AND a IDAC (2040 μA, 255 μA, and 31.875 μA ranges) that seem perfect for these meters.

Once again a great video! Also would like to encourage you to do more multi-part video series like this one the future - this might have been a good option for the lab power supply as well, btw - that way we get to see the progress you're making, how you experiment, what goes wrong, how to solve problems along the way - and you get many more videos out of one topic with hopefully not too much additional work (and at much less work per video).

@EvenTheDogAgrees

7 жыл бұрын

Agreed. Also makes it easier to follow if it's broken up in logical parts, every video covering one aspect instead of throwing the whole thing at you in one go.

Excellent informational video thank you

Never measure the resistance of a moving coil meter directly with a multimeter. Depending on a multimeter output voltage and the rated FS (it is called a Full Scale current not a maximum current) you can bend the needle or in the case of a really sensitive (tens of µA) taut band meters: burn it. The far more simpler method: Switch the multimeter to diode test mode, wire a pot or a variable resistor in series with the meter. This way you get the voltage drop across the pot and the meter. Simple math does the rest.

I have a large box full of old meters that I have collected over the years. Got some at ham radio swap meets and others from salvaged non-working equipment that was cheap to buy. Maybe I will now do something with them. Looking forward to next video. Many thanks for this. Also much appreciated your series on SMPS but I think it only got to episode 5. Any more after that?

Thanks, very useful video. I have some old ammeter and voltmeters laying around. some of them have a AC sign on them. Is there a specific difference in reusing those meters.

The audio on this production is wunderbar! Did you use the blanket technique that I suggested? I'm curious. Nice video anyhow!

@MrMilarepa108

7 жыл бұрын

seems like it, right?

@ThePostApocalypticInventor

7 жыл бұрын

Hey. I tried that, but it turned out to be extremely hard to work under the blanket so I went for a more professional solution: A "micscreen". But thanks again for the advice. I had ro realize that my new room, with its really high ceiling causes really annoying reverb. It used to be a problem before, but it got worse when I moved here. If you don't know what I mean by "micscreen": www.thomann.de/gb/the_tbone_micscreen_le.htm

@TechGorilla1987

7 жыл бұрын

Excellent choice!! That made a world of difference and really helps to accentuate your true voice. Nice job, sir!

Your idea and implementation of this series is wonderful! Thank you for taking the trouble to post this and I think it is the best video on KZread on this topic. Your comment about people too lazy to trouble with formulas was very funny - I felt a pang of guilt because that is too often me! But in a good way - Now I will strive to be more respectful to James Clerk Maxwell legacy.I hope you will consider making a comment in your future videos about converting AC meters (say 5V) to DC use (also 5V). Also the jeweled movement mechanisms are interesting as are the specifications of the fine copper coil windings with probably shellac insulation? Amazing that the Lac Bug exudates would remain the best and most non-toxic insulator even today.Also interesting that some modern meters are using piezo crystals to move the meter needles with a circular array of printed piezo elements sequentially controlled by a MCU instead of a electromagnetic coil.

Great video Thank you

There is some software out there for printing your own meter scales instead of cutting & pasting each digit separately. They have a basic version for free.

@Smelter57

5 жыл бұрын

Don't be a tease, give us a link!

Ich mach das schon seit jahren so, oder zumindest so ähnlich...ich löte intern alles ab und lege die spule direkt an die klemmen, so bin ich maximal flexibel, später wenn ich Drehspulmessinstument nutzen möchte. mach hinten immer einen aufkleber drauf, auf dem die spannung für rechtsanschlag steht. Schönes video :)

@edgeeffect

5 жыл бұрын

Was ist "Drehspulmessinstument" auf Englisch?

Your collection is amazing

Thank you, feel eager to see the next episode .

Great video!!

fantastic discussion. thank you.

I have here an Ammeter with a 4A scale and no visible shunt in it. The contacts are directly wired to the big outside coil. It is the end of the try to convert it to a 5V voltmeter?

Great analysis, but can you share an easy way to reattach a broken hair spring from its center mount???? Oh so difficult with shaky hands and no room .

I wish I could find some of these older meters.

salvaged rohde and schwarz meters... not shocked lol

Gibt es diese Videos auch in Deutsch. Dein Englisch hört sich ziemlich deutsch an, ist aber ausgesprochen gut und verständlich und man lernt sowohl viel von der Technik als auch die Sprache. Top.

@ThePostApocalypticInventor

7 жыл бұрын

Ich habe überlegt meine Videos in Zukunft auch auf Deutsch zu veröffentlichen, aber da ich nun über drei Jahre lang nur englische Videos hochgeladen habe, müsste ich dafür wohl einen neuen Kanal starten. Es würde die internationalen Zuschauer, die etwa 95% der Zuhörerschaft ausmachen, zu sehr nerven, wenn ihnen ständig Uploads angezeigt werden würden, die sie nicht verstehen. Ein neuer Kanal würde allerdings sehr lange brauchen um genug Zuschauer anzuziehen und den zusätzlichen Aufwand zu rechtfertigen. Ich bin mir noch nicht sicher, ob ich die Zeit darin investieren kann, aber auf jeden Fall danke für den Kommentar.

@tubical71

7 жыл бұрын

Wird zeit, daß YT endlich multiple audiospuren unterstützt, dann wär vieles einfacher....

@EvenTheDogAgrees

7 жыл бұрын

And fansubs/fandubs. Crowdsource your translations! ;)

You could use inexpensive 10 turn trim-pots for finer resolution.

@Roy_Tellason

3 жыл бұрын

That's what I did when trying to find out the internal resistance of a meter. Often what a DMM puts out in measuring a resistance is *way* too much, and will peg the meter, possibly damaging it. I use a 10K multiturn trimmer in series to get the meter to full scale, and then put a 1K multiturn trimmer across the meter and adjust it for half-scale. The resistance of the 1K trimmmer at that point is the same as the meter's internal resistance.

Excellent as usual. Vielen Dank

I hope the next episode comes soon because I'm still holding my breath ! =P

Interesting. The only meters I can find today are all from China. What is interesting about them is many are made at the same factory and sold by different sellers claiming to be the manufacturer. And they pretty much all have the same full scale input of 75 mV for the ammeters. And what is interesting about them is the meters can all be made the same. Just the paper printed scale is different. It is the shunts that are made to generate the 75 mV rating at different currents. For example one shunt is rated for 20 amps at 75 mV. So at 20A it generates a voltage of 75 mV across the shunt. One manufacturer makes just about all the shunts.

Good video.

I love vintage gauges / meters. I need several mergers. I need a fuel level meter. a couple amp meters 100amps or so. and a 400-500 amp. and a few DC volt métiers . a 100 volt DC. and one with at least 30-40volt range. maybe 60-80, since i at go up to 48volts with my inverter. its at 24v now. I think the fuel sender is 0-240 ohm. do you have any advice for gauges I could modify. or use outright. I don't really care for modern digital or fidgital gauges. since its off grid . I need not waste power on reading it. great video.

you need to build a cnc table for Laura kampes plasma cutter. collaborative build.

Hi! Great video, great project, lots of useful information! But... I've got a question for You. I have got a YF-S201 Wassermengenzähler Water Flow Sensor. It measures flow of water between 1 to 30 litres per second presented in PWM signal with frequency calculation of F=7.5*Q(L/Min). Of course I could use an Arduino and LCD to display the measurement... But I was wondering if You could help me (and everyone) convert a 0-30V analog voltmeter to display the flow rate in analog form from PWM singal. Thanks in advance!

Is there an application that can help me calculate the resistance that would go in series?

I love old meters!

Have you tried using a logarithmic potentiometer (as used in audio equipment) instead of 5 different linear trimmers in series to determine the value of the series resistor?

@shana_dmr

7 жыл бұрын

Of course you can, use big-ish log + small linear, it's a matter of what pots you have at hand:) I tend to use low voltage PSU (sometimes even battery) + one of these cheap Chinese 10-turn potentiometers that I wouldn't install in any equipment as they're a bit wonky, but for experimenting they work a treat.

Maaaaaaaan his voice is charming!

@foureyedchick

7 жыл бұрын

German accent

Can I use the same technique to convert a 15V meter to measure high voltages up to 50KV or even more?

ive got severl milli amp and micro amp swing meters ive had for years can these be made into volt and amp of a range that is usfull .phill

I would like to change my DC volt meter to AC. Anyone has done this? It is an analog DC 300 VOLT.

@jussapitka6041

5 жыл бұрын

You would have to put a rectifier to it and recalibrate.

Cool

nice!

How to turn a 500 AC milliammeter to a DC milliammeter?

Great video! Is it possible to use those meters for AC or does it have to be a different kind of moving coil meter?

@63ch31

7 жыл бұрын

fussydk They wouldn't work on ac unless you add arectifier and capacitor. But that's easy enough though.

@xysix2548

6 жыл бұрын

Run the AC through a rectum-fryer first. I wouldn't filter it, since that would make the meter slow to respond to changes.

@Roy_Tellason

3 жыл бұрын

You will run into some difficulties when it comes to getting a sufficiently high value resistor to be able to measure that high. Ordinary resistors also have maximum voltage ratings, which many people are not aware of, and probably can't be used in such a circuit.

Can someone help me out? I'm having some difficulty understanding the difference between "Nein" and "Kein". Also, would the two words sound the exact same in speech?

@edgeeffect

5 жыл бұрын

"Kein" (I think) is just a contraction of "Nicht ein". So You could say "Dieses messgerät ist kein voltmeter". Where "Nein" just means "no"... "Ist das ein voltmeter?", "Nein!"

@Sodbusterrod

3 ай бұрын

They both mean no, but kein is used before a noun. For example, kein Wunder- no wonder.

Good

Woher bekommt man so viele unterschiedliche alte Messinstrumente?

@ThePostApocalypticInventor

7 жыл бұрын

Ich bin im Laufe der Jahre immer mal wieder an alte defekte Messgeräte gekommen, die ich ausgeschlachtet habe. Oft sehr hochwertige Geräte von Rohde und Schwarz und ähnliche Herstellern. Wunderschöne Geräte, aber oft einfach in der Reparatur zu aufwendig. Man findet aber auch auf Ebay oft größere Sammlungen von Messwerken. Einfach mal auf Ebay "Messwerke" oder "Messinstrumente" eingeben, evtl. die Suche speichern, so dass man von Ebay automatisch benachrichtigt wird, wenn was neues eingestellt wird. Keine riesen Sammlung, aber nur ein Beispiel: www.ebay.de/itm/6-verschiedene-gute-analoge-Einbau-Messwerke-Messinstrumente-A-mA-V-db-W-/201846745104?hash=item2eff00e810:g:BCYAAOSw2gxYtqLI

great video, thx :-)

Anyone know a resource to obtain scrap meters?

What kind of temperature coefficients do these meters have? In current measurements, a copper moving coil would be kind of bad on its own if it had a shunt resistor with a different tempco.

Don't you have to sleep??? It i 02.33 in the morning;. Still nice vid :-)

When you write the number "One" ,"1" - it looks to my eyes like the number "Seven", ""7" - So much that I think to myself; "so if that is his ""1"; what does his "7" look like?But; it is okay; I do know that you meant "1" when you wrote ""7"... and because you are so good I put up with this quirk without complaining.. :-)

@shana_dmr

7 жыл бұрын

You're just used to English/American way of writing numbers probably:) Seven has additional bar. I have opposite problem - typical English/American 7 looks like a 1 to me and 1 written as vertical bar looks like nothing whatsoever;)

@edgeeffect

5 жыл бұрын

This is a continental European thing... We spent ages in Napoli trying to decipher our hotel's WiFi password... "is that a 7 or a 1?" I suppose if you've grown up hand writing 1 like that it's just normal............

yaaaaay

0:38 RHODE UND SCHWARRZT ahh ein deutscher :D

Kann es sein dass sie deutsch sprechen?