Thanks for doing this test! I wasn't sure whether or not these meters are TRMS, you proved they are.

@joesmith-je3tq

6 жыл бұрын

It's a TRMS meter but keep in mind the problems it has.

@mrjohhhnnnyyy5797

6 жыл бұрын

I'm fine with the protection it has, since I plan to use it for circuits under 100V. Maybe 350V DC tops, but not very often. Bandwith limitation is pretty sad, but it's kinda naive to want 100kHz bandwith from a DMM in this price range. Your last videos cleared things up about this meters, now I know what to expect and what not to do.

@joesmith-je3tq

6 жыл бұрын

Assuming you took the time to watch that long video, and you understood the problems, you should be good to go. I'm not sure if I couldn't increase the BW of this meter. The UT61E is a sub $50 USD meter and you gain higher resolution, much higher bandwidth, uA range, better switch contacts, standard fuses, serial interface to the PC.

Thanks for sharing. Interesting test 👍😀

Yes sir it is very useful video.

Basically waveforms are all that you will see in the field, and they all seem to be reasonable at showing the value. Shows nicely the value of a TRMS meter over average reading. Last one looks remarkably like a colour video signal, complete with colour burst in there and staircase grey step.

@joesmith-je3tq

6 жыл бұрын

Yes, you see waveforms in the field if you have a scope. lol. I am guessing you meant sine. For AC measurements, I see a fair amount of modulated waves and rectified. Link showing how we did this remote waveform. kzread.info/dash/bejne/hWuXk5KrdM7Rqco.html This link has the discussion. kzread.info/dash/bejne/q3hh05iboZrTnKg.html

People want to hate these Zotek meters but they come through pretty well for what they are. My concern now is the bit you mentioned in a former video about them putting a low impedance across the input when off because the alert that warns of approaching auto-shutoff has me switching them off while they are still wired into whats being worked on. I didn't catch what you said it was. I guess the question is how much voltage it can take while switched off.

@joesmith-je3tq

6 жыл бұрын

With the original meter, it's basically switching in that small PTC and clamp. I would not exceed what the datasheet for that part calls out. I suspect this is a 5mm part. From the few I looked at, maybe the 1K5. Keep in mind that too, this part may be over what other parts of the meter are rated for. Safest thing would be to treat it like the resistance mode.

@HillsWorkbench

6 жыл бұрын

Thanks, at 1.5K or so it won't be much of an issue at voltages I usually work with, but an essential thing to know about.

@joesmith-je3tq

6 жыл бұрын

I believe it is an MZ31-05?152?900. The withstand voltage for that part is 900.

@HillsWorkbench

6 жыл бұрын

So the impedance of the PTC should be ramped way up as one approaches that Voltage. Thanks for the spec.

@joesmith-je3tq

6 жыл бұрын

Yes. Even if you put fifty volts across it, the PTC would start to heat up and its resistance would increase. At some point the PTC will arc over as I have shown and that will pretty much be the end of the meter.

Hi , so you think it's safe to use at 220v live line? I mean stick it into the socket with live line? I am looking for capacitance checks for AC capacitors and for 220V live lines safe product, do you have any model in mind? Thank you!

@joesmith-je3tq

3 жыл бұрын

I am really only concerned with how robust the meters are. I also don't normally offer recommendations for products.

Hey there, just found your channel, really interesting content. About the true rms meters, why don't you run some fast and high(ish) amplitude pulses to see the difference between the trms and normal meters, since those have a very high crest factor. Cheers.

@joesmith-je3tq

5 жыл бұрын

I measured the 3dB point for this meter during one of the videos. Seems like it was maybe a couple of KHz was all.

Hi Joe, what kind of fuse style is this for the Kusuntest ZT102? I popped the 10a fuse and have no idea what it is called Any links ? thanks :)

@joesmith-je3tq

5 жыл бұрын

I have no idea who offers them. If you life here in the USA, you could try searching Mouser, Digi-key, etc. A few people were asking on the EEVBLOG site. Maybe try the search feature there and see if anyone posted.

Hey Joe, may I ask a question not related specifically to this video but generally to everyone you made. Where do you find the boxes for your DYI, I'm planning on doing few (VERY SIMPLE) things, but i'm not able to find decent boxes. For example i have yet to find a box big (and strong) enough but not hugely big for building my isolation transformer. The boxes i looked for (2 week research) are all very expensive, more than the stuff i have to put in, in the end a mini itx case would cost me less, maybe i should use one of those. I guess in the US you can have all those sort of stuff made for cheap and readily available in your big shops, maybe? Sorry for the partial off topic

@joesmith-je3tq

6 жыл бұрын

I handmade the two wood covered metal boxes that I used for the transient generators. These are both made from 1/4" plate aluminum.

@The_Bo

6 жыл бұрын

Ah, i see....I somehow expect it from you. Thank you anyway.

@joesmith-je3tq

6 жыл бұрын

There are pictures of their construction in the main forum. As soon as I get beyond a simple plastic Bud box, I normally make my own. Many of them are just simple sheet aluminum that I drill, cut and bend. Personally, I think it was a disservice to the public when we stopped teaching metal/wood working and machine shop in our schools. I guess we need to keep the kids safe....

Dear , Joe would like to know which one to buy FLUKE 101 or RM101? They are the same ? Greetings from Brazil ...

@joesmith-je3tq

6 жыл бұрын

Hello. The two meters you mention are not at all the same. The RM101 has a lot of features that the Fluke 101 lacks. The RM101 may also cost a fair amount less. Then again, I have put the Fluke 101 through a lot of tests over the years and this meter continues to hold up just fine. I suggest you download both manuals and compare the two.

Thank you it always nice to see that my contribution to the rms testing wasn't forgoten :] but i always wonder what was the frequency range of that test Mario astle have quite high frequency content, but on what base frequency wouls that meter roll down and how much did your modyficationschange the oryginal bandwidth?

@joesmith-je3tq

6 жыл бұрын

That's an interesting question. I am sure I hurt it but I really don't know to what extent.. How about we have a look?

@kokodin5895

6 жыл бұрын

how many of those things did you buy exactly? i just hope that you having fun with that meter, it was kind of boring during the vacation break without new videos to watch, your frankensteinian improvements always make me smile.

@joesmith-je3tq

6 жыл бұрын

Well, I have a surprise for you... So hang tight...

@joesmith-je3tq

6 жыл бұрын

Videos up.

You can pick up a generic antiglare screen protector for a few bucks. It'd probably make a world of difference on the scope

I'm wondering if you would recommend this (ZT102) meter to a beginner like me? Or is there's something else you can recommend in the same price, Thanks :)

@joesmith-je3tq

5 жыл бұрын

Sorry but I do not make recommendations. I will say that when I started playing with electronics, I was given a VTVM. I used that until I turned 13 years old. I then received a brand new Radio Shack analog meter and used that for several more years. It served me well for what I was doing. We all have different requirements for the tools we use. Enjoy your new hobby.

Do you know if it measures duty cycle in AC? If so how?

@joesmith-je3tq

6 жыл бұрын

I am not sure and suspect it may be meter to meter dependent. The last two I bought could make this measurement but the previous ones could not. There is no marking on the meter showing it supports it. One had grease on the contacts other have not. Every one used a different xtal. They are anything but consistent so I would suggest it's a grab bag. I am not sure what you meant be how. How to get it into that mode, how to hook it up, how does an ADC work with software to calculate DC.... Door it wide open when you toss out questions without details.

Does your ZT102A still give you accurate reading when you measure diode? Does it read correct voltage when testing diode? Thanks 😊

@joesmith-je3tq

5 ай бұрын

Are you trying to compare two different meters and seeing two different values and that is why you are asking? If so, have a look at any diode datasheet. Drop will be a function of current. As for this particular meter, I made a series where I had modified it. It's not a good example.

This scopemeter is you 97 At a local site there is one listed as Philips PM97. I was confused by its BW, since is a 50Mhz but If not mistaken it samples at 25MSs ?. I dont remember the numbers but I was puzzled at this time. Didnt know about Philips working together with FLUKE. I have read some review from long term users and they had issues with the backlight ... I always have a look to scopmeters by Fluke. Used a 123 on a Daily basis for two years .... LOVED IT. I would love to AFFORD a 199 ... welll .... I cant paint my UNITs yellow I guess LOL

@joesmith-je3tq

4 жыл бұрын

The 97 does indeed have a max sample rate of 25 MS/s. Of course you would expect for a 50MHz analog BW scope, it would be much faster. They way they get around this is by using RIS, or in this case, they refer to it as a quasi random sampling. If the signal repeats and the scope is able to get a stable trigger, it can then delay the sampling by some amount. On each trigger, the delay is changed depending on the algorithm used. It takes several snapshots to reconstruct the waveform. My old LeCroy 7200 for example has an analog BW of 4GHz, yet it only samples I think at 100KHz. If buying a new DSO, you want to make sure you understand what your requirements are and if the scope will meet your needs. If you have random data, you want to make sure that the single shot rate is fast enough for what you need.

@38911bytefree

4 жыл бұрын

@@joesmith-je3tq Many thanks for the explanation Sir, pretty clear. They should anotate "periodic signals only". Probably they did and missed it out. It is a good point. Today I tend to look more at the GS/s rate (or MS/s) than the BW because I do most digital and sometimes events are non repetitive. THese damm Flukes still pretty expensive here, even when they are mid 90s. But they are good tools, rugged and reliable. In the end, they worth their money (not so sure now with the most recent scopemeters). Regards

@joesmith-je3tq

4 жыл бұрын

@@38911bytefree Just be aware, that sample rates will depend on the mode. So while that vintage 4GHz LeCroy I mentioned may only sample at 100KHz or so, in RIS, it samples at 100GS/s!!! Make sure you understand the difference before buying anything.

ZT102 have more features, precision and it's more affordable than the 107, yet which one would you recommend?

@joesmith-je3tq

3 жыл бұрын

I would recommend you read the FAQ. The link is in the description.

@androidgameplays4every13

3 жыл бұрын

@@joesmith-je3tq Thank you, I will read it now.

That's a re-branded Aneng meter from China.

Joe, I read there are various ways of measuring RMS value; Thermal AC-DC converters, Peak and Averaging AC-DC conversion, Analog AC-DC converters and finally Digital Sampling. In that regard which category does this meter vs Brymen 869s fall under. There's some reading on the web, but it's a little heavy on the cream for me; Maybe you can shed some light on the matter. literature.cdn.keysight.com/litweb/pdf/5988-6916EN.pdf?id=1000002261:epsg:apn

@tech29X

4 жыл бұрын

Also, there are DVMs adverised true RMS for AC only and some AC+DC. As for AC/DC, I like Thunder Struck, and "highway to hell".

So far, the only issue I see with this cheap little meter, is the wrong CAT rating. If they would just rate it lower it would be a fine meter?

@joesmith-je3tq

6 жыл бұрын

I would say that depends on what you are willing to overlook.

@bbreeuwer4577

6 жыл бұрын

What do you exactly mean by that?

@asdfhun

6 жыл бұрын

Don't forget the most annoying feature of this meter, the 15 sec timer of the backlight, wich starts to count when you press the light button and nothing makes to reset that timer. You press a button or switch metering mode in the 14th sec? It doesn't care, 1 sec and the light is off, how stupid is that? Also, the distance between the two tiny plastic feet on the back is less than the two buttons on the top, so every time you press a button it wants to tumble upside down.

@joesmith-je3tq

6 жыл бұрын

dA, meaning if you are willing to overlook all the problems I have pointed out making these videos and depending on what you consider to be "fine", then sure, I could see someone calling it an excellent product.

@bbreeuwer4577

6 жыл бұрын

joe smith Well, the way I see it, is it's basically a CAT I/CAT II meter, with a very decent resolution. It has some quirks, but you can work around these things. For low voltage electronics fine, for heavy electrical work a no-go.

This is a good meter for a starting electrician for its price.

@joesmith-je3tq

Жыл бұрын

I don't know of any electrician or company that would employ them using an uncertified product. Sounds like in your country that's not the case.

No