ZOYI ZT702S/ANENG AOS02: Real User Reviews on Performance & Features?

I watched a few videos on YT and it looks like we finally have a decent oscilloscope for a hobbyist for less than PLN 300. It is available under several brands: ZOYI ZT702S, BSIDE ZT702S, and ANENG AOS02 (and probably a few others). I wonder if any of the electrod enthusiasts have already had it in their hands? On paper it looks at least decent - a 10000 counts multimeter, i.e. 4 full digits, and an oscilloscope with a normal oscilloscope probe and sampling rate of 48 MSa/s (real-time!), 64 kB memory and a bandwidth of 10 MHz (actually 5 MHz). Regular DSO, without any frills, with decent refresh rate. If this is true, then all toy oscilloscopes lose their meaning. It is worth noting that the oscilloscope is implemented without the use of ASICs, on the quite popular AT32F403 microcontroller and a 10-bit ADC converter, and also has a decently designed analog front-end.

https://www.aliexpress.com/item/1005005661605508.html

https://www.eevblog.com/forum/testgear/new-zo...scopes-zt-70xs-up-to-50mhz250msps-(nov-2022)/



Tell us what you think about it?

There is also (at least in plans) a cheaper ZT701S variant (3 MHz@24 MSa/s) without a BNC input, and a more expensive two-channel ZT703S (2x 50 MHz@250 MSa/s).

Quite a nice piece of equipment for the money. I tested it for a few minutes. Does not remember settings after turning off. It is very difficult to attach another probe or coax, there is not enough space and without pliers there is no chance. The periodic waveform on the oscilloscope shakes too much on the screen. The analog band may be 10MHz, but above 5-6, even with a sine wave, miracles start to happen. The course curls up like spaghetti. Nice screen, the image is clearly visible, wide angles. It even has some memory for the signal and saves nice pictures.
It`s useful. I`ll be doing comprehensive tests soon, maybe I`ll add something.

With a sampling rate of 48 MSa/s and operation only with real-time sampling (RTS), one cannot expect to be able to reproduce waveforms with a frequency higher than 5MHz, but this is the case with many, even "serious", oscilloscopes.

My copy is on its way to me... when I find some time, I will share my impressions. I hope they are better than in the case of Mustoola MT8206 and at the same time I hope that it will be a worthy replacement for the old Velleman HPS40.

tzok wrote:

I hope they are better than in the case of Mustoola MT8206

Heaven and earth.

Quote:

With a sampling rate of 48 MSa/s and operation only with real-time sampling (RTS), one cannot expect to be able to reproduce waveforms with a frequency higher than 5MHz, but this is the case with many, even "serious", oscilloscopes.

However, in my opinion there is something missing in the acquisition algorithm. The stability of the non-sinusoidal waveform above 1MHz is not great. You may get the false impression that the signal is distorted, there are quite large discrepancies between the samples transmitted to the screen. Some averaging is missing (maybe not enough memory to process the waveform?).






I updated the software (very easy) and now it remembers the oscilloscope settings after turning it off. That`s all for now. If I have time, I`ll take a look at it soon.

My copy arrived today. I chose ANENG AOS02 because it was the cheapest and for the price of the basic set of PLN 258.97 I got the PRO version with additional test leads (theoretically it was a more expensive option). The order arrived within 10 days. I have software version 1.03.51.

I checked the multimeter with a voltage standard and it is perfect, the error is +/- 1 of the least significant digit. Resistance measurement, also "on point" with my "standard" resistors. The multimeter`s measurement bandwidth is typical of 1 kHz (here the MT8206 with a bandwidth of up to 150 kHz simply "rocked"). The software version reminds you to use the correct measurement terminals each time you switch from voltage measurement to current measurement.

The oscilloscope remembers the settings, but the multimeter does not, and the operating mode (oscilloscope/multimeter) is not remembered either.

Indeed, waveforms above 2 MHz "float" a bit, but an oscilloscope up to 5 MHz is quite useful and you can easily recognize the shape of the waveform. 10 MHz with sampling 48 MSa/s is, of course, fiction. The interface is responsive and quite intuitive to use. The chart is refreshed very quickly, nothing "cuts off". Unfortunately, the sensitivity of the input track is poor - with the x10 probe, the minimum sensitivity is 200 mV/div. (old Velleman HPS40 had 50 mV/div), maximum only 100 V/div. There`s nothing crazy about the time base either - from 100 ns/div to 20 s/div (roll mode from 250 ms/div). In practice, this means that you can conveniently observe waveforms with a frequency of up to 2 MHz and an amplitude of at least 1 V. The trigger level is scaled proportionally to the sensitivity and it cannot be set to 0 V (for the highest sensitivity it is 10 mV in 20 mV steps) . After performing the calibration procedure, it can be set to 0, but there is approximately -3% offset relative to the indicated trigger level, i.e. for a sensitivity of 1 V/div. (10V visible on the screen), when setting the trigger level to e.g. 0V, in reality it will be set to -300 mV.

Here you can see the shift of the trigger point (set to 0V):


By the way - after saving the screen, the waveform disappeared from the screen even though the oscilloscope remained in RUN mode. For it to appear, the acquisition had to be stopped and resumed.

There you go, oscilloscopes for everyone! And that`s very good, at this price there is no point in playing DSOxxx

Hello. My copy arrived on Saturday and I have a small problem with it. When I calibrate the probe on the x10 divider, the waveform is perfect, but as soon as I switch to 1:1, strong spikes appear and I can't do anything with them. System calibration did not help, software update did not help and with the 1:1 setting it does not respond to turning the control. Is this also the case in your copies? I've already checked the connections, but nothing helped. Could this be due to a poor probe? Thank you in advance for any help.

Out of habit with a normal oscilloscope, I never use the x1 mode and for me it might not be there. This mode has no compensation and this is a general rule. I checked and such pins are also visible, I don`t know if it interferes with anything...

Here is a comparison of the same probe with Aneng, on Aneng and on a real oscilloscope:



Just an auxiliary question - have you connected the ground cable of the probe?

Yes of course. The first thing I thought was that there was poor contact and I moved the ground cable on the probe itself and the crocodile clip on the built-in generator ground. I don't have much experience with oscilloscope equipment, so it didn't even occur to me that this could be a normal thing. As soon as I return to work, I will ask more experienced colleagues who use better equipment (PicoScope) and check the operation on another probe.

I bought such an oscilloscope as additional support for controlling pulses with a fairly long duration of 50-300ms, so that I could have it in one compact device together with a meter. I was a bit surprised, the "NORMAL" trigger only works up to a base of 100ms and there are problems here, it loses impulses, triggers on one impulse in turn. The situation gets worse the further the trigger point is moved from the default center of the screen to the left. For a base of 50ms and below, everything works fine.
Another difficulty is the problematic navigation of the memory buffer, recording signals with a long base allows after stopping the recording "STOP" to reduce the base and view the buffer with the "MOVE" function, but because the "memory map" on the screen is not recalculated for a given base (something changes there only in ranges below 250us, but this probably represents a limitation of the sample capacity) and when moving sideways there are no signs of movement, so navigation is quite inconvenient, but you can see something there.

The above problems are rather software-related, so you can count on them being removed in newer versions, provided that the manufacturer puts in the effort.



Correct 5 50/50ms pulses


Two pulses lost


Two pulses lost. Trigger on the second pulse


Buffer with a base of 1 s/div filled with pulses, the map shows the whole thing (on the right you can see some remnants of previous waveforms)


The same buffer in a close-up of one of the series of impulses, we cannot see on the map where we are in the buffer

>>20656953
How to update the Aneng AOS02 firmware?

Same as ZOYI but I don`t think there are any updates, ANENGi have already come out with newer firmware.

Does ANENG have an official website, I looked but I can't find it

There is no, but ANENG is just a brand, the manufacturer of the meter is ZOTEK and you can order a batch from them under any brand (name). Apart from the sticker on the case, there is no mention of ANENG anywhere, the box is "generic".

A firmware update (v1.03.58) has been released, correcting the non-intuitive arrangement of ammeter options in the multimeter menu.
The update is available for download at: https://zotektools.com/firmware-update/
You can also update devices under the Aneng brand.

My copy of AOS02 just arrived today. Works.
I have firmware v1.03.55 and I would like to save the original version before updating.
Is there a way to do this? The folder shown on YT is empty for me.

@Mastertech
This will probably not be possible, such update folders are unidirectional, after the update the device deletes the file, otherwise it would want to update.

Pity. Now there is no logo when turning on, there is the inscription Digital Osciloscope.
If I upgrade, will I have the ZOYA logo?

There is no logo

I don`t think I`ll take the risk of upgrading. Everything works OK, in the version I have, it already remembers the MODE in which it was last used, there are no problems with saving the waveform, it is correctly detected as a USB memory and does not hang after exiting F2 from the PC connection. I like it, keep it up.
Today I took out my old DSO138 for photos and I was amazed at how similar the screens displayed are and how similar the operation is.

You don`t have to be afraid of updates. The logo will not change. If the file is not fully loaded into Flash memory, the update will not be performed (it is not done "live" via USB).

The temperature measurement with the probe included in the set is accurate to 1°C, which is very poor.
But the x1/x10 probe switch in the Menu is broken, it does not respond to the change at all. And changing the position of the switch in the probe itself on the test signal gives a change of x3/x10. In the x10 position, the amplitude of the 1kHz rectangle is 3.00V, so the problem is in the x1 position, which is practically not used, so no one has probably checked it. I`m waiting for Hantek, he will come with probes and I will check these dividers carefully.

A resolution of 1°C when measured with a K probe is simply... realistic. You can display the result with 3 decimal places, but why?

The oscilloscope probe switch works correctly for me:
- probe at x10 and x10 set in the menu: Vpp of the calibration signal = 3.08V (1V/div):

- probe on x1 and x1 set in the menu: Vpp of the calibration signal = 3.27V (1V/div):

I calibrated again and I see that everything is OK.

Mastertech wrote:

I don't think I'll take the risk of upgrading.

I bought the Aneng and immediately upgraded from .55 to .58. You can do it with confidence, the initial "Digital Oscilloscope" text does not change to another one, there are no problems. Maybe you won't do it, but I leave this information for posterity

Complete success with Hantek purchased in the manufacturer`s store motivated me to further experiments.
PLN 200 is not a fortune, it`s a pity you can`t make a copy like you can with an oscilloscope.


Added: and after the procedure, the current firmware version is 58,
I don`t know what it adds or improves, I just have such a rush to update everything.

Have any of you tested cyclic measurement?
What is the range for setting the time between measurements?
Are measurement results saved in memory? Is a graph with the measurement results drawn?

Regards. Kamil

Subsequent software corrections mean that the oscilloscope reproduces waveforms better and better. Unfortunately, there is still a lot of work ahead for ZOYI...

>>20844049
Cyclic measurement with an oscilloscope is a method of measuring the period, frequency, and amplitude of a signal. It involves measuring the duration of one complete signal cycle.

What did you mean when you asked about cyclic measurement?

ozgas wrote:

Subsequent software corrections mean that the oscilloscope reproduces waveforms better and better. Unfortunately, there is still a lot of work ahead for ZOYI...

It`s similar for me with DC coupling. However, after reducing the gain to 2V/div. indicates correctly. With AC coupling, measurements are correct regardless of the selected gain.