EEVblog Electronics Community Forum

Products => Test Equipment => Topic started by: Free_WiFi on September 29, 2019, 12:18:19 am

Title: Super Ultra stable Aneng 8008
Post by: Free_WiFi on September 29, 2019, 12:18:19 am
Just replace the electrolytic caps on the filter for the digital ADC with 6 ceramic smd caps 96nf each + 1 tantalum 630uf
Title: Re: Super Ultra stable Aneng 8008
Post by: Free_WiFi on September 29, 2019, 12:30:23 am
The only 1 problem with this multimeter is the mechanical switcher :(
Basically when i'm going to set the Ohm range i need to not miss the perfect spot for the switcher,because the multimeter will play with random numbers ...
So basically at this point i still need to check the switcher and see what's going on there.
Title: Re: Super Ultra stable Aneng 8008
Post by: Free_WiFi on September 29, 2019, 01:01:34 am
SMART TWEEZERS LCR Meter Model ST5S VS Aneng 8008 with replaced caps on ADC
Title: Re: Super Ultra stable Aneng 8008
Post by: trobbins on September 29, 2019, 06:16:04 am
I'm unsure what you are improving, as you haven't identified a problem or defined it. 

Why is this thread called 'super ultra' - when there is no benchmark or reference test of stability?  Do you mean it is just has a stable display?

Are you just applying extra filtering to the battery dc supply to the chip?  If you want to do that appropriately then you need to apply the filtering as close to the chip as possible.

(https://www.dalmura.com.au/static/Aneng%208009%20bypass%20addition.jpg)
Title: Re: Super Ultra stable Aneng 8008
Post by: CDaniel on September 29, 2019, 07:02:23 am
I don't want to be mean , but at the end of the day is just a very cheap chinese multimeter , whatever you do ... better then others cheap multimeters but that's about it .
Title: Re: Super Ultra stable Aneng 8008
Post by: trobbins on September 29, 2019, 07:50:01 am
Well it is a very accurate meter for some types of testing and far exceeds the accuracy I often need, and I would typically round down the digits if I was to record certain measurements.  And it is very convenient when I can connect 2 or 3 meters to equipment to know what is going on as things change, and that can reduce the risk of continuously having to swap probe positions to confirm status or make changing measurements.  And it's effectively 'free' - so at the end of the day it is a meter and a very convenient meter to have a few on hand at the bench.
Title: Re: Super Ultra stable Aneng 8008
Post by: Free_WiFi on September 29, 2019, 09:23:28 am
I have made this topic,because a lot of users which own's this dmm have the same common problem regarding the slowness and random reading on the Ohm range.
So basically there is noting of wrong if i call my topic Super ultra stable aneng especially when i've fixed it's childish sickness from factory.
 :-+
Title: Re: Super Ultra stable Aneng 8008
Post by: Fungus on September 29, 2019, 10:19:29 am
This was done ages ago:

https://hackaday.com/2017/11/24/a-few-caps-for-a-faster-multimeter/

There's a whole thread about modding these meters on here somewhere but I can't find it.  :(

Good to keep the idea alive though, never forget!
Title: Re: Super Ultra stable Aneng 8008
Post by: Free_WiFi on September 29, 2019, 10:37:41 am
This was done ages ago:

https://hackaday.com/2017/11/24/a-few-caps-for-a-faster-multimeter/

There's a whole thread about modding these meters on here somewhere but I can't find it.  :(

Good to keep the idea alive though, never forget!

Yes! i'm perfectly aware of that,but in any case after my so called "RESEARCHes" i found that ceramics or tantalum caps are the the best for this kind of task and this is because the electrolytic caps tend to jam the measurments.
This effect is caused due charge/discharge after you turn on or off this particular model of DMM.
Title: Re: Super Ultra stable Aneng 8008
Post by: trobbins on September 29, 2019, 12:07:25 pm
electrolytic caps tend to jam the measurments.
Is this what you and others have observed?  What is the actual observation?
I've never had anything abnormal happen with just an electrolytic as filter.
Title: Re: Super Ultra stable Aneng 8008
Post by: Free_WiFi on September 29, 2019, 12:17:42 pm
Is this what you and others have observed?  What is the actual observation?
I've never had anything abnormal happen.
Maybe because my electrolitycal caps are bad or whatsoever,btw my multimeter with electrolytical caps do bouncing measurements and can't never settle to some point
Title: Re: Super Ultra stable Aneng 8008
Post by: GigaJoe on September 29, 2019, 04:26:13 pm
the next step would be replace 4M oscillator
my stable with 12 ( if i remember right) , caps measure you need to divide :) and beeper sound too thin ... ; but it really fast now

i have another one it works with 24M ( was 4M), super fast,  i use it to probe resistors ....  an auto range count down in a blink ...

upd:  TO-92 are Vref,  next to are small cap shunt, that not enough,    so 1-10uf tant.  would be much better ....
Title: Re: Super Ultra stable Aneng 8008
Post by: 001 on October 12, 2019, 09:20:32 am
sorry for necroposting
but no new posts about anangs
why?

is it became common gear now or nobodys use it?
Title: Re: Super Ultra stable Aneng 8008
Post by: Gyro on October 12, 2019, 11:06:14 am
Because there's nothing else to say about it?
Title: Re: Super Ultra stable Aneng 8008
Post by: 001 on October 12, 2019, 11:20:47 am
Because there's nothing else to say about it?

is it bad or good?
Title: Re: Super Ultra stable Aneng 8008
Post by: ThickPhilM on October 12, 2019, 11:40:18 am
Good for electronics hobbyists who never go above 24vdc or so, bad for anything more serious.
Title: Re: Super Ultra stable Aneng 8008
Post by: tooki on October 12, 2019, 10:54:47 pm
sorry for necroposting
but no new posts about anangs
why?

is it became common gear now or nobodys use it?

It’s not necroposting to reply to a thread that is just 2 weeks old!!! That’s barely a nap!

The unrelated question, however, is a faux pas.
Title: Re: Super Ultra stable Aneng 8008
Post by: blueskull on October 12, 2019, 11:16:43 pm
Good for electronics hobbyists who never go above 24vdc or so, bad for anything more serious.

Even CAT II 300V should be good enough for 99% residential applications.
The demand for a higher CAT, higher voltage meter is greatly overhyped.

FYI, your common household electronics are rated CAT II, 300V (2.5kV transient identified by IEC60950-1).
If you don't expect a power brick to explode without a reason, you don't expect this thing to explode.

The only difference is, if this thing explodes, it explodes in your hand. But on the other hand, it's only connected to mains briefly, not 24/7.
I would totally be confident to poke 220V with a CAT II 300V meter.

It's way more dangerous to use a metal smartphone/computer while being charged from a CAT II 300V rated charger, which is what I do all the time.

I also call the creed to HRC fuses bullshit. The only time an HRC use is needed is when you accidentally poked your current input to high voltage WHILE THERE IS A TRANSIENT.
Just imagine the possibility. How much a chance there is for you to catch that elusive 8/20us transient providing you will anyway withdraw the test leads if you short an AC mains?

Shorting the AC alone without a transient is not that dangerous, at least not for single phase (<=240V) residential voltage after AFCI/GFCI panel.
Unless you live in a Scandinavian country, chances you get 3P ~400V (which can get you serious arc burning) to your house is pretty low.

There are truly bad meters like those 830B, which will catch on fire just from selecting wrong mode, even if input is within its rated voltage.
But other than that, I don't consider any meter dangerous if used with only residential (after breaker) applications -- as long as it reads a voltage when the input is hot.
Title: Re: Super Ultra stable Aneng 8008
Post by: maginnovision on October 13, 2019, 01:55:37 am
I don't even think these are that dangerous because they usually fail on me as soon as they're near mains voltages. How long are you going to play with mains when your meter is busted?
Title: Re: Super Ultra stable Aneng 8008
Post by: trobbins on October 13, 2019, 08:55:34 am
I go well above 24Vdc with my Aneng AN8009 for valve amp benchwork. I don't use it for mains side measurements.  There are a myriad diy applications where it is an excellent general purpose multimeter. 

The comment that it is only useful below 24Vdc is naive.
Title: Re: Super Ultra stable Aneng 8008
Post by: Gandalf_Sr on October 13, 2019, 09:54:41 am
I own the Aneng 8008 and I've added better MLCC capacitors and noticed that does seem to improve the stability/settling. I also calibrated it against my 34461A and bought a set of gold-plated leads for it that cost almost as much as the meter.

It's accurate and the display is VERY easy to read.  I use it a lot to track voltages on small 3.3V or 5V embedded projects.
Title: Re: Super Ultra stable Aneng 8008
Post by: ThickPhilM on October 13, 2019, 03:05:53 pm
I go well above 24Vdc with my Aneng AN8009 for valve amp benchwork. I don't use it for mains side measurements.  There are a myriad diy applications where it is an excellent general purpose multimeter. 

The comment that it is only useful below 24Vdc is naive.


You're deliberately misquoting me, but w/e

If you want to trust your bodily integrity to a sub-par piece of equipment, that's your choice. It isn't mine.

@blueskull, about HRC fuses, if you think you only need those for safely measuring things on your domestic line supply or higher, you should be aware that ELV DC arcing is as dangerous, and is likely to have lower impedance where it's likely to occur.

FYI I have a couple of Chinesium meters, and they are damn useful, a UNI-T UT139C and a Mastech MS2108A, the latter of which has an unparalleled (for the money) 40ADC current clamp range, which is accurate to +/-1 lsd compared with a 1% tolerance shunt.

The UT139 does at least have HRC fuses, but I'd still rather use one of my better quality meters to measure something that has the potential to harm me.

In a little over 40 years of sticking various probes in dubious places, I've only killed 1 meter (UT61), and that was when I dropped some pliers on it and broke the LCD  |O
(though I have blown quite a few fuses)
Title: Re: Super Ultra stable Aneng 8008
Post by: 001 on October 13, 2019, 03:48:01 pm

-
Ok
What You can say about UT139C vs UT61E?
Title: Re: Super Ultra stable Aneng 8008
Post by: tggzzz on October 13, 2019, 04:02:41 pm
sorry for necroposting
but no new posts about anangs
why?

is it became common gear now or nobodys use it?

It’s not necroposting to reply to a thread that is just 2 weeks old!!! That’s barely a nap!

The unrelated question, however, is a faux pas.

It is just 001 being 001. Have a look at the threads he's started :(

It makes me wish for a sub-threaded interface where I could ignore anything 001 posts, plus all replies to his posts - but still see anything other (most) other people post.
Title: Re: Super Ultra stable Aneng 8008
Post by: Fungus on October 13, 2019, 04:17:46 pm
It is just 001 being 001. Have a look at the threads he's started :(

Yep.


-
Ok
What You can say about UT139C vs UT61E?

 :scared:
Title: Re: Super Ultra stable Aneng 8008
Post by: ThickPhilM on October 13, 2019, 05:05:35 pm
Ok
What You can say about UT139C vs UT61E?


Well, its model number is more than twice as big, so I'm guessing it's more than twice as good  ^-^
Title: Re: Super Ultra stable Aneng 8008
Post by: blueskull on October 13, 2019, 05:40:50 pm
about HRC fuses, if you think you only need those for safely measuring things on your domestic line supply or higher, you should be aware that ELV DC arcing is as dangerous, and is likely to have lower impedance where it's likely to occur.

Those 1808 SMT fuses might fail under a direct 60V short, but that arc won't be much longer, meaning your hand should be able to withdraw the probes easily far away from arc's maximum length.
For those cheap meters, I really can't care if it survives an arc flash, what I care most is if the operator survives.

When I say arc burning, I mean those super hot, super long arcs that can heat air to explosion and burn the operator. I just can't see 60V doing such damage.
Of course, I've never shorted 60V. The highest voltage (with unlimited current, such as a battery) I've ever shorted is 24V (floating at ~28V), and it's really not a big deal other than a brief flash. Couldn't even feel the heat.

FYI, my way of keeping meters from blowing up is not to measure current at all. My daily driver (a pocket "credit card" meter) doesn't even have a current jack.
Whenever possible, when I design a test setup, I have current sensors built in, so I only have to probe voltage, not current.
I do have meters that are safe and can measure current, but I usually find measuring voltage safer.
Title: Re: Super Ultra stable Aneng 8008
Post by: MiroS on October 14, 2019, 09:58:06 am
The most stable Aneng 8008 is dead one or one in recycle trash. You cannot make it  safe.
Title: Re: Super Ultra stable Aneng 8008
Post by: trobbins on October 14, 2019, 10:22:58 am
What a woeful and worthless comment - no technical content, no actual observations.
Title: Re: Super Ultra stable Aneng 8008
Post by: 001 on October 14, 2019, 10:49:04 am
What a woeful and worthless comment - no technical content, no actual observations.

Yea
It is typical Myros comment
He hate all asian gear
Title: Re: Super Ultra stable Aneng 8008
Post by: ThickPhilM on October 14, 2019, 05:27:46 pm

Those 1808 SMT fuses might fail under a direct 60V short, but that arc won't be much longer, meaning your hand should be able to withdraw the probes easily far away from arc's maximum length.
For those cheap meters, I really can't care if it survives an arc flash, what I care most is if the operator survives.

When I say arc burning, I mean those super hot, super long arcs that can heat air to explosion and burn the operator. I just can't see 60V doing such damage.
Of course, I've never shorted 60V. The highest voltage (with unlimited current, such as a battery) I've ever shorted is 24V (floating at ~28V), and it's really not a big deal other than a brief flash. Couldn't even feel the heat.

FYI, my way of keeping meters from blowing up is not to measure current at all. My daily driver (a pocket "credit card" meter) doesn't even have a current jack.
Whenever possible, when I design a test setup, I have current sensors built in, so I only have to probe voltage, not current.
I do have meters that are safe and can measure current, but I usually find measuring voltage safer.


Yeah, I was thinking more along the lines of a nominal 48VDC system, like they used to use in big telecoms switches.
The float voltage in those was around 54V or so, and you'd be amazed at the potential energy. I saw some clips a while back on various short testing they did, it was pretty impressive, and incredibly destructive   :-DD
I'll see if I can dig them out and link them in.

Some of the UPSs I've worked on have batteries with over 400VDC and a nominal Wh rating of around 400000 or so. Needless to say, I was super careful when working on those   :-/O
Title: Re: Super Ultra stable Aneng 8008
Post by: blueskull on October 14, 2019, 05:39:05 pm
400v DC arc is certainly not fun. I've heard stories, such as light emitting inductors.
Title: Re: Super Ultra stable Aneng 8008
Post by: ThickPhilM on October 14, 2019, 06:02:21 pm
Here we go, hope you find it as interesting as I did!

54V DC Battery Short Circuit (https://www.youtube.com/watch?v=DpQeDcEpEn0)
Title: Re: Super Ultra stable Aneng 8008
Post by: Gandalf_Sr on October 14, 2019, 06:07:46 pm
Many moons ago, I worked at an old Strowger telephone exchange in the UK which had a BIG room full of single-cell lead-acid batteries, each about 3 x 3 x 4 feet wired to give 50V with big copper bus bars about 2 x 1 inches feeding through a hole in the wall.  One day someone dropped a large wrench which landed across the bus bars and created a large flash and bang; we ran across the room to see what had happened and there were 2 ends of the wrench welded to the bus bars with the center part drooped on either side and blown out like a fuse.  The exchange kept running although I expect there was a click on people's phone conversations.

I would not use my AN8008 for 400 volt work, the CAT info printed on the case is pure fiction IMHO.
Title: Re: Super Ultra stable Aneng 8008
Post by: Gandalf_Sr on October 14, 2019, 06:12:22 pm
Here we go, hope you find it as interesting as I did!

54V DC Battery Short Circuit (https://www.youtube.com/watch?v=DpQeDcEpEn0)

Not exactly non-destructive testing eh?
Title: Re: Super Ultra stable Aneng 8008
Post by: rsjsouza on October 14, 2019, 06:33:44 pm
Here we go, hope you find it as interesting as I did!

54V DC Battery Short Circuit (https://www.youtube.com/watch?v=DpQeDcEpEn0)

Pretty interesting clip. Thanks for sharing. At 4 minute mark, the gassing is a deadly spectacle.

The first time I saw impressive low voltage but high energy circuits was during the ultracapacitor frenzy - a video from Afrotechmods was quite interesting to watch.

https://youtu.be/EoWMF3VkI6U (https://youtu.be/EoWMF3VkI6U)

That shows one thing: for professional environments use professional tools. For hobby uses regular tools are ok, unless one ventures into professional territory. Making the distinction is key.


Title: Re: Super Ultra stable Aneng 8008
Post by: Fungus on October 14, 2019, 07:14:25 pm
Just make triple-sure the cable is in the volts socket and the switch is set to measure voltage and you'll be fine...  :)
Title: Re: Super Ultra stable Aneng 8008
Post by: 001 on October 15, 2019, 11:45:38 am
Just make triple-sure the cable is in the volts socket and the switch is set to measure voltage

interesting idea  :-+