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

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#61 21772698 06 Dec 2025 08:14

reneeww reneeww

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Post #61
21772698 06 Dec 2025 08:14

4est wrote:
Hence also the question, as before, whether, for replacement of the original battery, to look for an 18650 LiHV cell, but without PCM, e.g. SANYO UR18650ZTA or LG ICR18650 E1, or a recycled - polaptop LG ABC28650, or a "normal" quality 18650 with a final charge voltage of 4.2 V, but with PCM? The vision of constantly overcharging the battery scares me.

After all, you have given yourself the answer

4est wrote:
Somehow I feel strange if I were to rely on a BMS with a sub-standard battery.

Since you don't want to rely on embedded circuitry in the cell then only LiHV. Also, you have an approach to this as if you had equipment for several thousand pln and not for 200.Which ever option you choose will be fine
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#62 21772701 06 Dec 2025 08:26

4est 4est

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Post #62
21772701 06 Dec 2025 08:26

reneeww wrote:

After all, you gave yourself an answer

This was a question on my part, and if it was vague, I'll put it another way: is it safe to use an 18650 cell adapted to a final voltage of 4.35 volts in this case?

reneeww wrote:

Since you don't want to rely on embedded circuitry in the cell then only LiHV. Also, you have an approach to this as if you had equipment for several thousand pln rather than 200. Which ever option you choose will be fine

It's a desire to avoid a mistake that could end up in a fire, for example. Here, I guess, the prospect of the value of the equipment - a few hundred zlotys or a few thousand zlotys - doesn't really matter?
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#63 21772977 06 Dec 2025 15:04

tzok tzok

VIP Meritorious for electroda.pl

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Post #63
21772977 06 Dec 2025 15:04

18650 cells are generally safe, firstly, the one built in has electronic BMS protection (which itself introduces some voltage drop there), secondly, every cell of this type has mechanical protection, thirdly, the charging current in the last phase is small enough that I don't see any danger here, apart from shortening the life of this cell.
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#64 21773014 06 Dec 2025 15:45

4est 4est

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Post #64
21773014 06 Dec 2025 15:45

After inserting an LG ABC28650 cell, sourced from a disassembled laptop battery, into the meter, the charging LED on the meter goes off when the battery reaches 4.35 volts, so as intended with the fitted circuit.
The meter charges with a 5 V DC charger and a maximum current of 850 mA, so I hope that such a set-up guarantees peace of mind and at the same time I won't be milking the cell.
#65 21773228 06 Dec 2025 20:00

E8600 E8600

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Post #65
21773228 06 Dec 2025 20:00

tzok wrote:
The 18650 cells are generally safe

I would be wary of those shipped from China in the cheapest equipment, as they vary in CID. I had a case where a cell broke like a steel pipe breaks at the seam, and the CID did not work. The cell was from a Chinese copy of a Makita battery, and had cracked while lying in a stockpile of other cells, fortunately without fireworks. My guess is that it burst out of embarrassment because it had a measured capacity of 0.5 Ah (such junk cells are in batteries added gratis to tools).
As for the multimeter, apparently the designers envisaged putting a more modern higher capacity cell in there to make the equipment last longer, but the accountants had to save on something. I would also make sure that the multimeter does not discharge the cell below the safe threshold without the additional BMS, because maybe there is a bug on the board and the additional BMS fixed it.
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#66 21773264 06 Dec 2025 20:34

tzok tzok

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Post #66
21773264 06 Dec 2025 20:34

I think it is rather chicano to extract a few extra minutes of operation and to compensate for the voltage drop on the BMS.
#67 21773536 07 Dec 2025 09:41

4est 4est

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Post #67
21773536 07 Dec 2025 09:41

E8600 wrote:

I would still make sure that the multimeter does not discharge the cell below the safe threshold without this additional BMS because maybe there is a bug on the board and this additional BMS fixed it.

That's an accurate point. I've put in a LiHV without a PCM to "match" the built-in charge controller, but indeed it's not clear whether the same controller will take care of the discharge level of the internal battery 🤔
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Topic summary

The ZOYI ZT702S, BSIDE ZT702S, and ANENG AOS02 are budget-friendly handheld oscilloscopes combined with multimeters, priced under PLN 300, targeting hobbyists. They feature a 10,000-count multimeter with 4 full digits, a real-time sampling oscilloscope at 48 MSa/s, 64 kB memory, and an analog bandwidth of approximately 5-6 MHz despite a nominal 10 MHz rating. The devices use an AT32F403 microcontroller with a 10-bit ADC and a well-designed analog front-end. Firmware updates have improved functionality, including remembering oscilloscope settings and fixing menu navigation issues. However, limitations remain in waveform stability above 1-2 MHz, especially for non-sinusoidal signals, likely due to acquisition algorithm constraints and lack of averaging. The x1 probe mode shows spikes and calibration challenges, but x10 mode is stable and accurate. The temperature probe included has low accuracy (~1°C resolution). Firmware updates are available from ZOTEK, the OEM manufacturer behind these brands, with shared firmware across ZOYI and ANENG models. The ZT703S is a higher-end two-channel version with a built-in generator, offering improved performance and is recommended over the ZT702S/AOS02 for users needing more features, though it costs more (~PLN 350-400). Users report some firmware bugs, limited trigger functionality at longer time bases, and navigation issues in memory buffer viewing. Overall, these devices provide good value for basic oscilloscope and multimeter functions but have inherent limitations typical of low-cost instruments.
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FAQ

TL;DR: 48 MSa/s real-time sampling makes the ZT702S/AOS02 “[Heaven and earth]” compared with earlier combo scopes [Elektroda, slavo666, post #20656953] Firmware v1.03.58 adds useful fixes [Elektroda, tzok, post #20813843] Why it matters: you get scope-level visibility and a 10 k-count DMM for ≈ PLN 260.

Quick Facts

• 48 MSa/s single-shot sample rate, 64 kB buffer [Elektroda, tzok, post #20656563]
• Analog bandwidth: Spec 10 MHz, usable ≈ 5 MHz [Elektroda, slavo666, post #20656825]
• Multimeter: 10 000 counts, ±1 LSD on DCV [Elektroda, tzok, post #20660379]
• Time base: 100 ns–20 s/div; roll from 250 ms/div [Elektroda, tzok, post #20660379]
• Street price: PLN 258–300 (AOS02), PLN 350–400 (ZT703S) [Elektroda, tzok, #20660379; #21141649]

What core specifications define the ZT702S/ANENG AOS02?

It combines a 48 MSa/s 10-bit ADC, 64 kB memory, nominal 10 MHz bandwidth, 100 ns–20 s/div sweep, and a 10 k-count DMM with ±1 LSD DC accuracy [Elektroda, tzok, #20656563; #20660379].

How much bandwidth can I trust?

Signals look reliable to ≈ 2–5 MHz. Above 5–6 MHz sine waves distort and square waves curl like “spaghetti” [Elektroda, slavo666, post #20656825] The 10 MHz figure is marketing, not measurement grade.

Is the multimeter section accurate?

Yes. Checked against a voltage standard, DC error stayed within ±1 least-significant digit, and resistance readings matched known standards [Elektroda, tzok, post #20660379] AC bandwidth is limited to 1 kHz, unlike the 150 kHz MT8206 [Elektroda, tzok, post #20660379]

Will the instrument remember my last settings?

Firmware ≥ 1.03.51 stores oscilloscope settings; ≥ 1.03.55 also recalls MODE; the DMM range still resets on power-up [Elektroda, tzok, #20660379; Mastertech, #20831346].

How do I update firmware safely?

Download the .bin from zotektools.com [Elektroda, tzok, post #20813843]
Power off, connect USB; the meter mounts as a drive.
Copy the file; eject. On reboot it flashes, then auto-deletes the file. Incomplete copies abort the upgrade, so risk is low [Elektroda, tzok, post #20831424]

Is ZOYI firmware compatible with ANENG units?

Yes. Hardware is identical; AOS02 and ZT702S share the same firmware package [Elektroda, ozgas, post #21107992]

What bugs were fixed after launch?

v1.03.55 added setting retention; v1.03.58 reordered ammeter options; later 1.4.x for ZT703S cured autorange freezes and <250 ns jitter [Elektroda, tzok, #20813843; Atreyu, #21247564].

Why do high-frequency square waves jitter?

The 48 MSa/s rate leaves few samples per cycle above 1 MHz, and averaging is missing, causing screen-to-screen discrepancies [Elektroda, slavo666, post #20656953] Reducing time base or using the built-in averaging applet minimizes the effect.

What generator capabilities does the two-channel ZT703S include?

In application mode it outputs 50 Hz–344 kHz sine, 50 Hz–500 kHz square, and 2.5 Vpp fixed amplitude (2 Vpp above 995 Hz) [Elektroda, Atreyu, post #21220569] An on-device applet limits range to 10 Hz–5 kHz with 1 or 2.5 Vpp.

ZT703S vs. Owon HDS242—worth the extra cost?

ZT703S costs ≈ PLN 350 and offers 2 channels plus generator; HDS242 is ≈ PLN 470 and adds deeper memory and 40 MHz bandwidth. For hobby use and intuitive menus, several owners chose ZT703S [Elektroda, tzok, post #21141649]

My display goes dark after 2 minutes—can I change that?

Yes. Enter the System menu and set BL Time to a longer interval or OFF. This stops the backlight timeout [Elektroda, Atreyu, post #21342070]

Why does x1 probe mode show spikes while x10 is clean?

x1 mode lacks compensation networks. With the supplied probe, spikes are normal and usually harmless; most users stay in x10 [Elektroda, tzok, post #20737266] Ensure the probe ground lead is clipped near the test point.

Does the instrument log cyclic measurements?

No. The scope can store a captured buffer, but it does not timestamp or plot successive DMM readings. For trend logging you need external software or a separate datalogging DMM [Elektroda, electro, post #20737656]

Edge case: when does triggering fail?

NORMAL trigger loses 50–300 ms pulses at 100 ms/div and slower; two pulses often disappear in long-base captures [Elektroda, electro, post #20737656] Firmware updates may reduce but not eliminate this.

3-step How-To: fix 0 V trigger offset

Enter Self-Cal (Utility → Cal). 2. Short the probe tip to ground. 3. Run calibration; trigger can now reach 0 V, although a −3 % offset remains [Elektroda, tzok, post #20660379]