logo elektroda
logo elektroda
X
logo elektroda
Advanced Search
logo elektroda

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

tzok 38430 83
Best answers

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]
Generated by the language model.
ADVERTISEMENT
Treść została przetłumaczona polish » english Zobacz oryginalną wersję tematu
Report a violation of the law
Reply | New topic
  • #31 20881728
    ozgas
    Level 12  
    Posts: 21
    Rate: 5




    Further tests for other runs.
  • ADVERTISEMENT
  • #32 20886790
    slavo666
    Level 24  
    Posts: 729
    Help: 37
    Rate: 387
    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
  • ADVERTISEMENT
  • #33 21085557
    Zenereczek
    Level 13  
    Posts: 138
    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: 488
    Help: 9
    Rate: 108
    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.
  • ADVERTISEMENT
  • #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?
  • #39 21141292
    tzok
    VIP Meritorious for electroda.pl  
    Posts: 38693
    Help: 3162
    Rate: 6464
    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 24  
    Posts: 729
    Help: 37
    Rate: 387
    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  
    Posts: 38693
    Help: 3162
    Rate: 6464
    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
  • #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: 369
    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: 1096
    Help: 65
    Rate: 315
    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: 369
    >>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: 369
    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  
    Posts: 38693
    Help: 3162
    Rate: 6464
    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: 38693
    Help: 3162
    Rate: 6464
    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: 541
    Help: 7
    Rate: 79
    @tzok do you have any experience with this new firmware 1.64 ? Is it possible or again some bugs
  • ADVERTISEMENT
  • #57 21767986
    tzok
    VIP Meritorious for electroda.pl  
    Posts: 38693
    Help: 3162
    Rate: 6464
    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: 541
    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.
Reply | New topic
Report a violation of the law

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.
Generated by the language model.

FAQ

TL;DR: For hobbyists under PLN 300, the ZT702S/AOS02 is a useful 48 MSa/s combo meter/scope, but users found its practical oscilloscope limit closer to 2–5 MHz. One owner called it “quite a nice piece of equipment for the money.” This FAQ helps buyers judge whether its firmware, trigger, and probe quirks matter for bench use. [#20660379]

Why it matters: This device can replace toy DSOs for basic debugging, but its real limits show up fast with small, high-frequency, or long-duration signals.

Alternative Approx. price from thread Channels / extras Thread verdict
ZOYI ZT702S / ANENG AOS02 PLN 258.97–300 1 channel, multimeter Strong value, but firmware and display limits
ZOYI ZT703S About PLN 350–400 2 channels, generator “Definitely worth paying extra”
Owon HDS242 About PLN 470 2 channels Better on paper, but higher cost

Key insight: The thread’s consensus is simple: the ZT702S/AOS02 is good enough to keep on a hobby bench, but not good enough to trust near its headline oscilloscope specs. Firmware updates improved behavior, yet users still report trigger, x1 probe, storage, and high-frequency display issues. [#21141649]

Quick Facts

  • The most repeated real-world oscilloscope limit was not 10 MHz. Users said waveforms are comfortably usable to about 2 MHz and still recognizable up to roughly 5 MHz. [#20660379]
  • The multimeter side impressed more than the oscilloscope side. One owner checked voltage and resistance against standards and reported about ±1 least significant digit on voltage, with resistance also “on point.” [#20660379]
  • Practical scope ranges reported in use: minimum sensitivity 200 mV/div with a x10 probe, maximum 100 V/div, and time base from 100 ns/div to 20 s/div, with roll mode from 250 ms/div. [#20660379]
  • Firmware mattered early. Version 1.03.51 was seen in July 2023, and version 1.03.58 later fixed the confusing ammeter menu layout and remained installable on ANENG-branded units. [#20813843]

How well does the ZOYI ZT702S / ANENG AOS02 actually perform as a budget oscilloscope and multimeter in real-world hobby use?

It performs well as a cheap bench companion, but better as a multimeter than as a serious oscilloscope. Users praised the bright screen, fast refresh, screenshots, and roughly ±1 least significant digit voltage accuracy, while also reporting that scope work becomes less trustworthy above about 2–5 MHz. One buyer paid PLN 258.97 for an ANENG AOS02 bundle and judged it a useful replacement for toy DSOs. If you mainly debug low-frequency logic, power, or audio, it fits the job. [#20660379]

Why do waveforms on the ZT702S/AOS02 start to float, shake, or look distorted above about 2–5 MHz even though the spec mentions 10 MHz bandwidth?

They float because the hardware and acquisition method run out of margin before the headline spec. Multiple users said 48 MSa/s real-time sampling makes 10 MHz “fiction,” and one tester saw non-sinusoidal signals become unstable above 1 MHz, with sine waves degrading above 5–6 MHz. Another owner said the trace starts to “float” above 2 MHz, even though the shape remains recognizable up to about 5 MHz. In practice, the display looks less like distortion measurement and more like rough waveform indication. [#20660379]

What limitations should I expect from the ZT702S oscilloscope input sensitivity, time base, and trigger behavior when measuring small or fast signals?

Expect clear limits with weak, fast, and offset-sensitive signals. One owner reported a minimum of 200 mV/div with a x10 probe, a maximum of 100 V/div, and a time base of 100 ns/div to 20 s/div. That user concluded the scope is comfortable up to about 2 MHz and about 1 V amplitude. Trigger level also showed about a -3% offset after calibration, so a displayed 0 V trigger could behave like about -300 mV at 1 V/div sensitivity. Small signals are where the compromise shows first. [#20660379]

How do you update firmware on the ANENG AOS02 or ZOYI ZT702S, and where can the official firmware files be downloaded?

You update it through the device’s USB storage, not with a PC installer. 1. Connect the meter to a computer and open its internal drive. 2. Copy the firmware file into the firmware area. 3. Disconnect so the device can process the update. Users said ANENG-branded units can use the same ZOYI/ZOTEK firmware, and one post linked official downloads at the ZOTEK firmware update page when v1.03.58 was released. [#20813843]

Why does the x1 probe mode on the ZOYI ZT702S / ANENG AOS02 show spikes or strange amplitude behavior compared with x10 mode?

x1 mode behaves worse because it is not compensated like x10 mode. One owner said this is a general rule and that they never use x1 on a normal oscilloscope. Another user saw strong spikes in 1:1 mode during calibration, while x10 looked clean. Later testing also showed setup matters: after recalibration, another owner found the x1/x10 menu setting worked correctly again, with the calibration square wave reading about 3.27 Vpp in x1 and 3.08 Vpp in x10. [#20835929]

What is real-time sampling (RTS) in an oscilloscope, and how does it affect what the ZT702S can display accurately?

"RTS" is an oscilloscope sampling mode that captures each waveform from live, single-pass samples, without reconstructing it from repeated cycles, which makes sample rate the hard limit for accurate high-frequency display. On the ZT702S, users explicitly tied its behavior to 48 MSa/s RTS and said you should not expect faithful reproduction much above 5 MHz. That explains why the device can still show a trace near 10 MHz while no longer showing a trustworthy shape. [#20656831]

What is a LiHV 18650 cell, and why are some users worried about the ZT703S charging circuit taking the battery up to 4.35 V?

"LiHV 18650" is a lithium-ion cylindrical cell that charges to a higher final voltage, typically 4.35 V instead of 4.20 V, which increases runtime but requires a charger designed for that upper limit. Users opened the ZT703S and identified an ME4086B charger IC, then noted it charges the internal cell to 4.35 V. The concern is simple: replacing the original cell with a standard 4.20 V 18650 could overcharge it, even if the current tapers late in the cycle. [#21772625]

How accurate is the multimeter side of the ZT702S/AOS02 for voltage, resistance, temperature, and AC measurements compared with its oscilloscope mode?

The multimeter side is the stronger half of the product. One owner checked DC voltage against a standard and reported about ±1 count error, with resistance also matching reference resistors closely. AC measurement bandwidth was described as a typical 1 kHz, which is modest. Temperature measurement with the included probe was criticized for only 1°C resolution, but another user replied that 1°C is realistic for a K-type probe in this class. Overall, the meter inspires more confidence than the scope. [#20660379]

What causes the ZT702S/AOS02 NORMAL trigger to miss long pulses at slower time bases like 100 ms/div or 1 s/div, and what workarounds help?

Users traced the missed pulses to firmware behavior in NORMAL trigger mode at slow bases, not to a broken input. One tester using 50–300 ms pulses said NORMAL worked properly at 50 ms/div and below, but at 100 ms/div it started dropping pulses and could trigger on every other pulse. The same post also described awkward buffer navigation after capture. A workable approach is to capture, stop, reduce the base, and inspect the buffer with MOVE, though the memory map still stays confusing. [#20737656]

When the ZT702S internal USB storage looks full even though the firmware and picture folders are empty, how do you recover space and restore the folders?

You recover it by formatting the device’s internal storage as FAT32 from the PC side, then reconnecting it. A user with firmware 1.03.55 reported 0-byte firmware and picture folders while the whole 16 MB drive still looked full. Another owner tested the fix directly on an AOS02/702 and said the firmware and pic folders recreate themselves after USB disconnect and reconnect. A factory reset afterward can also reset file counters, and recalibration is recommended. [#21904455]

Which firmware issues were fixed in later ZT702S/AOS02 releases like v1.03.58, and what bugs still remain according to users?

Later firmware fixed some usability issues, but not the core oscilloscope compromises. Users reported that updates added scope-setting memory retention and that v1.03.58 corrected the confusing ammeter option layout. At the same time, owners still reported high-frequency waveform instability, odd x1 behavior before recalibration, storage quirks, occasional screen-refresh glitches after saving images, and missed long pulses in NORMAL trigger mode. By May 2024, one poster felt development had slowed and bug fixing had largely stopped for the 702 series. [#21085557]

How does the ZOYI ZT703S compare with the ZT702S and the Owon HDS242 for price, usability, channels, and overall value?

The ZT703S is the better instrument if you can spend more. In the thread, owners placed the ZT703S around PLN 350–400, versus about PLN 258.97–300 for the ZT702S/AOS02 and about PLN 470 for the Owon HDS242. Users said the 703 is “definitely worth paying extra” because it adds two channels and a generator, while one poster still preferred ZOTEK’s interface over Owon’s. Another user argued the HDS242 is the smarter step-up if you can stretch the budget. [#21141649]

What frequency ranges and output amplitudes does the built-in generator on the ZT703S support for sine, square, triangle, sawtooth, and related waveforms?

On firmware batch 1.3.9, users measured broad generator ranges in application mode and much smaller ones in Output mode. Application mode ranges reported were: sine 50 Hz–344 kHz, square 50 Hz–500 kHz, triangle 50 Hz–100 kHz, half-sine 50 Hz–129 kHz, double half-sine 50 Hz–294 kHz, and sawtooth 50 Hz–100 kHz. Output mode, which shows the waveform on-screen, was limited to 10 Hz–5 kHz for sine, square, and triangle. Peak-to-peak output was usually 2.5 Vpp, but sine fell to 2.0 Vpp above 995 Hz. [#21220569]

How does cyclic measurement work on these ZOYI/ANENG meters, what time interval can be set between measurements, and where are the logged results stored or graphed?

The thread does not provide a usable answer, because nobody documented the feature with settings, intervals, or storage behavior. One user asked whether cyclic measurements save results, allow interval selection, or draw a graph, but the reply only explained cyclic signal measurement in general and did not test the meter’s logging functions. So from this thread alone, there is no verified time interval, no confirmed memory logging method, and no confirmed results graph. [#20875742]

What is BMS or PCM protection in an 18650 battery, and how does it matter when replacing the original cell inside a ZT703S?

"BMS or PCM protection" is a small battery protection circuit that monitors a lithium cell for unsafe charging, discharge, or current conditions, adding a safety layer but also some voltage drop and packaging complexity. In the ZT703S discussion, users said the factory cell includes integrated protection, while replacement choices raised two risks: charging a 4.20 V cell up to 4.35 V, and not knowing whether the meter itself prevents over-discharge without that extra board. That makes protection type part of the battery decision, not just capacity. [#21773536]
Generated by the language model.
ADVERTISEMENT