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

tzok 36804 66
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Is the ZOYI ZT702S / ANENG AOS02 actually a decent low-cost hobby oscilloscope-meter, and what are its real-world performance and feature limits?

Yes: users found it good value for the money, but its usable oscilloscope performance is closer to about 5 MHz than the advertised 10 MHz, and waveforms above roughly 2 MHz start to float or jitter [#20660379][#20656825][#20656953] The multimeter side was praised for accurate voltage and resistance readings, but its bandwidth is only about 1 kHz, far below the older MT8206’s wider bandwidth [#20660379] The screen is bright and readable, the interface is responsive and intuitive, and the scope can save screenshots/waveforms [#20656825][#20660379] Early firmware had bugs such as forgetting settings after power-off and some trigger/buffer navigation issues, though later firmware updates fixed at least the saved-settings problem and were released for Zotek/Aneng units [#20656825][#20656953][#20737656][#20813843] Overall, it is seen as a surprisingly capable compact scope-meter for hobby use, but not a replacement for a real oscilloscope for higher-frequency work [#20873965][#20660379]
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  • #31 20881728
    ozgas
    Level 12  
    Posts: 21
    Rate: 5




    Further tests for other runs.
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  • #32 20886790
    slavo666
    Level 23  
    Posts: 724
    Help: 36
    Rate: 384
    Report all errors to Zotek, there is a good chance that they will release a corrected firmware.
    zotekmultimeters(_at_)gmail.com
    or
    info(_at_)zotektools.com
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  • #33 21085557
    Zenereczek
    Level 13  
    Posts: 137
    Help: 7
    Rate: 29
    I think they've stopped making corrections, you don't see updates for a long time.
  • #34 21085570
    electro
    Level 18  
    Posts: 487
    Help: 9
    Rate: 106
    I fear that here the situation will again confirm the rule "buying cheap you pay twice"
  • #35 21107810
    Kryspin_29
    Level 12  
    Posts: 21
    Rate: 4

    Is the firmware from ZOYI compatible with ANENG? ZOYI has a good website so there is a chance of development, I have not found the ANENG website. There is also a two-channel version with a generator, has anyone dealt with it?
  • #36 21107992
    ozgas
    Level 12  
    Posts: 21
    Rate: 5

    They are one and the same software. AOS02 is the same as ZT702S
  • #37 21108365
    Kryspin_29
    Level 12  
    Posts: 21
    Rate: 4

    >>21107992 Thanks.
  • #38 21141285
    StaruchPl
    Level 11  
    Posts: 111
    Rate: 11
    I am considering buying this equipment but I see that a version of the ZT-703s has appeared. From the descriptions it looks like it should have better performance 2 channels and a generator. Have any of you already used it? Is it worth paying extra for this version?
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  • #39 21141292
    tzok
    VIP Meritorious for electroda.pl  
    Posts: 38662
    Help: 3162
    Rate: 6408
    Yes, I have both, definitely worth paying extra for the 703.
  • #40 21141298
    StaruchPl
    Level 11  
    Posts: 111
    Rate: 11
    >>21141292 Thanks for your reply - You have convinced me :)
  • #41 21141514
    slavo666
    Level 23  
    Posts: 724
    Help: 36
    Rate: 384
    StaruchPl wrote:
    I am considering buying this equipment but I see that a ZT-703s version has appeared. From the descriptions it looks like it should have better performance 2 channels and a generator. Have any of you already used it? Is it worth paying extra for this version?
    .
    The 703S is already around 400PLN. It is worth paying extra 70zł for the Owon HDS242.
    The generator in the Zoya is a pickup for water.
  • #42 21141649
    tzok
    VIP Meritorious for electroda.pl  
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    The ZT-703S costs about 350zł, the HDS242 is already 470zł.... Is it worth it - yes, but there is always a 50-100zł model that is a bit better. By the way, the ZOTEK is, in my opinion, more intuitive to use than the OWON.
  • #43 21141694
    StaruchPl
    Level 11  
    Posts: 111
    Rate: 11
    I've just browsed the internet a bit for information on both of these devices and I think I'll stick with the Zoya Zt703S For my purposes it will suffice and, as tzok writes, I find its operation more intuitive
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  • #44 21166745
    Japi
    Level 11  
    Posts: 9
    Rate: 1
    slavo666 wrote:
    The generator in the Zoya is a pic of water.


    And could you give the range of generated frequencies for each signal and the amplitude of the output signal?
  • #45 21220569
    Atreyu
    Level 23  
    Posts: 643
    Help: 55
    Rate: 368
    Japi wrote:
    slavo666 wrote:
    The generator in the Zoya is a pickup.


    And could you give the range of generated frequencies for each signal and the amplitude of the output signal?


    A few days ago a ZT703s fell into my paws. The following results for the latest 1.3.9 batch.

    1. in application mode v1.0.1 (without being able to observe on the device display):

    Sinus: 50Hz-344kHz (max)
    Rectangular: 50Hz-500kHz
    Triangle: 50Hz-100kHz
    semi-sine: 50Hz-129kHz
    double semi-sine: 50Hz-294kHz
    Sawtooth: 50Hz-100kHz

    Peak-to-peak voltage Vpp: 2.5V non-adjustable. For sine only up to 995Hz, above that it is only 2Vpp.

    2. in applet "Output" mode (with on-screen waveform observability, but limited oscilloscope time base to 100µS/div)

    Rectangle 10Hz - 5kHz, 1 or 2.5Vpp, fill 25, 50, 75 and 90%
    Sinus 10Hz-5kHz, 1 or 2.5Vpp
    Triangle 10Hz-5kHz, 1 or 2.5Vpp

    Without the generator applet active and with the output locked in the application, a 1kHz 3Vpp rectangular signal is maintained on the calibration connection.
  • #46 21247528
    ...KUBA...
    Level 25  
    Posts: 1095
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    Hey, I have a question for people who have ZT703S with firmware 1.3.8 or 1.3.9, do you have a problem in oscilloscope mode below 250ns the waveform even from the built-in generator stops being shown?
    Supposedly version 1.3.9 should solve this problem but with me after the update to this version nothing has improved.
    "1. Fixed jitter issues in waveforms under a 250ns time base."
  • #47 21247564
    Atreyu
    Level 23  
    Posts: 643
    Help: 55
    Rate: 368
    >>21247528 I admittedly have FW 1.4.2, 1.3.9 caused constant problems with the auto-range f-cation. I haven't noticed any problems with a time base of 250ns or shorter. The internal generator on limits the time base to 100µS regardless of the FW version.
  • #48 21342039
    strzyzol
    Level 16  
    Posts: 313
    Help: 6
    Rate: 82
    I have a question, I bought an ANENG AOS03, do you also have it that the display switches off after 2 minutes it is annoying, not to mention the switch off of the meter which can be set for a certain time.
  • #49 21342070
    Atreyu
    Level 23  
    Posts: 643
    Help: 55
    Rate: 368
    strzyzol wrote:
    display turns off after 2min
    .
    -> BL Time
  • #50 21343023
    strzyzol
    Level 16  
    Posts: 313
    Help: 6
    Rate: 82
    Thanks I found
  • #51 21754579
    4est
    Level 12  
    Posts: 37
    Rate: 6
    I'm guessing I can get a gold shovel for digging up the topic, but I came across a post from another forum where people are bumping up (rightly, it seems) the internal battery charging thread. The multimeter has a standard 18650 battery (4.20V), and the charging circuit installed treats it as LiHv and charges it to 4.35V. Is anyone familiar with such a subject? Has anyone who owns a ZOYI ZT703S perhaps paid attention to this when inspecting the inside of the meter?

    Greetings,
    4est.
  • #52 21756162
    tzok
    VIP Meritorious for electroda.pl  
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    The factory battery (of despicable quality anyway) has an integrated BMS....
  • #53 21756189
    4est
    Level 12  
    Posts: 37
    Rate: 6
    Somehow I feel strange if I were to rely on a BMS from a sub-standard battery.
    In this situation, the only thing left is to replace the battery with a LiHV or replace the controller that watches the charging voltage.
  • #54 21762980
    N_Jacek
    Level 11  
    Posts: 34
    I have a ZT-703S with software version 1.64. When measuring capacitance, I cannot change the range - it is auto mode; the AUTO/RANGE button changes nothing.
    When measuring resistance, auto and range change work. I cannot make measurements of order pF capacitance.

    How is it in your meters? Capacitance measurement only in auto mode?
  • #55 21763488
    tzok
    VIP Meritorious for electroda.pl  
    Posts: 38662
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    It is not possible to measure such small capacitances with this type of meter anyway. In several different automatic meters it is also not possible to manually set the range of capacitance measurement, the measurement always starts from the lowest range and successively moves to higher ranges during the measurement.
  • #56 21766343
    reneeww
    Level 12  
    Posts: 539
    Help: 7
    Rate: 79
    @tzok do you have any experience with this new firmware 1.64 ? Is it possible or again some bugs
  • #57 21767986
    tzok
    VIP Meritorious for electroda.pl  
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    I have no major reservations about it.
  • #58 21768662
    maniak0790
    Level 23  
    Posts: 715
    Help: 50
    Rate: 80
    It's nice that the manufacturer remembers the ZT-703S because the 702 has long since been forgotten and there are a mass of bugs to improve.
  • #59 21768682
    reneeww
    Level 12  
    Posts: 539
    Help: 7
    Rate: 79
    I suspect they are making new softwares because they have a vested interest in doing so i.e. they want to learn something for future products, and here the zt703s is better than the 702
  • #60 21772625
    4est
    Level 12  
    Posts: 37
    Rate: 6
    Back to the subject of the battery, a brand-new zt703s arrived for me and indeed the charging circuit, as people on the eevblog forum wrote, is ME4086B, so according to the data sheet it charges the built-in battery to 4.35V.

    https://datasheet4u.com/pdf-down/M/E/4/ME4086-Microne.pdf

    Hence the question, as before, for replacement of the original battery, should I 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.
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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.

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].

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

  1. 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]
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