New handheld scope+DMM, Fnirsi 2C53T, 2ch, 50MHz/250MSps (Aug 2024) - Page 1
Forum section: electronics / testgear

author: tunk
author_rank: Super Contributor
timestamp: August 22, 2024, 04:57:18 pm
content: Kudos to EEVblog member Vad-B who first found this.I've taken the liberty to copy the content of his post in the 2C23T thread:https://www.eevblog.com/forum/testgear/new-handheld-scopemultimeter-fnirsi-2c23t-2ch-10mhz50msps-(november-2023)/msg5614517/#msg5614517FeatureFNIRSI-2C23TFNIRSI-2C53TSample Rate (Oscilloscope)50MS/s250MS/sAnalog Bandwidth10MHz50MHzStorage Depth32kb1k pointsVertical Sensitivity20mV/div-10V/div (X1)10mV/div-10V/div (X1)Time Base Range50ns-10s10ns-20sDisplay ModeYT/ScrollYT/Scroll/XYWaveform AnalysisNone8 basic operations + FFTCursor MeasurementNoneAvailableMultimeter Digits4 digits (10,000 points)4.5 digits (20,000 points)DC Voltage Measurement9.999V~999.9V1.9999V~1000VAC Voltage Measurement9.999V~750.0V1.9999V~750.0VDC Current Measurement9999uA~9.999A19.999mA~9.999AAC Current Measurement9999uA~9.999A19.999mA~9.999AResistance Measurement999.9Ω~99.99MΩ199.99Ω~19.999MΩSignal Generator Frequency1Hz-2MHz0-50kHzSignal Types (Generator)713

author: Platis
author_rank: Newbie
timestamp: August 28, 2024, 11:00:50 pm
content: Specs-wise its looks like anFNIRSI 2C53Pin the shell of an 2C23T! Very nice indeed!Is there someone here who have bought one yet?Not available at the moment on aliexpress, but 7 sold.On the 2C53PStorage Depth is up to 64kBGenerator Freq up to 10MHz sine and 5MHz on the rest of the waveformsProbably the same spec on 2C53T

author: tutochkin
author_rank: Contributor
timestamp: September 06, 2024, 05:24:09 pm
content: Good day. I apologize in advance - I do not speak English (communication through a translator), so there may be misunderstandings. I am the owner of this device (2c53t). I also have 2c23t and ZOYI ZT-703S. Therefore, I can compare them.In general, the problems of the 23rd were partially removed, partially left, and new ones were added. The problem of increasing the set signal remained (when measuring the oscillogram, pressing pause, then changing the time does not lead to a change in the diagram on the screen.). This remained.The problem of triggering on single signals is more likely solved than not. The front is not always in the center of the screen, but I did not notice any non-triggering during observations.but the generator will cause problems now. If at a voltage of 0.1V the 53rd shows itself better than the 23rd, then later everything is the other way around. I think everything is visible in the photo. Yes, now the maximum frequency on the sine wave is 50 kHz. They added new signal forms, but why are forms of such quality needed?Lissajous and mathematics are of course interesting, but... but at least they work, unlike FFT. I couldn't understand the spectrum... Maybe I haven't figured out the device yet.https://youtu.be/1E0RQBMMkVQ?si=zoathklqYMns4IsP

author: tutochkin
author_rank: Contributor
timestamp: September 30, 2024, 06:09:00 pm
content: It is very interesting, has the release of 2C53T been canceled? Somehow there is no new information or reviews about him...

author: hertz.smog07
author_rank: Newbie
timestamp: October 22, 2024, 05:36:49 am
content: They were simply sold out. They had a new batch just last week and I bought one from Taobao.

author: tutochkin
author_rank: Contributor
timestamp: October 24, 2024, 07:03:50 am
content: https://www.fnirsi.com/products/2c53t

author: Platis
author_rank: Newbie
timestamp: November 02, 2024, 06:29:08 pm
content: Very nice indeed!Better in every aspect except the bandwidth of the function generator.Little strange that it is much worse than the old model, 50kHz vs 2MHz?X-Y, FFT and mathfuctions is a big plus for me.

author: ee00
author_rank: Newbie
timestamp: November 23, 2024, 04:24:46 am
content: Looks nice, works OK until it HANGS in the "Awaiting Auto Measurement" in the oscilloscope mode.There is absolutely no way to get it out from this...You have to wait until the battery will drain out.Garbage...Unfortunately I cannot return it.

author: ee00
author_rank: Newbie
timestamp: November 23, 2024, 04:35:12 am
content: i found the reset hole - it is near the USB port on the right side of the device.The leg of the 0.25W resistor works just fine here.I also found that disassembling this multimeter is rather too compicated - the rubber around the edge looks like non-removable on purpose and I decided not to try to get it out since it was about to break completely. So - your best friend is this reset hole near the USB port.It looks that (unfortunately) it will be used pretty often...

author: tutochkin
author_rank: Contributor
timestamp: November 30, 2024, 03:24:09 pm
content: I can't confirm the hangup. The device has been in active operation for more than two months, it has never been observed to freeze.

author: jbtronics
author_rank: Contributor
timestamp: November 30, 2024, 10:13:46 pm
content: I have opened my 2C53T. I have not found any images of the interior yet, so here are some.You need to apply some force to pry open the latches, but disassembling is not that difficult. The rubber is basically just inserted between the upper and lower plastic half and will come out easily, if you open the device.Unfortunately, most chips numbers are etched away. Many parts of the board look pretty similar to the 2C32T, however.The 2C53T has twice the serial flash (128MBit instead of 64Mbit) and a different FPGA (GW1N-UV2)

author: LucSVK
author_rank: Contributor
timestamp: December 08, 2024, 06:13:05 pm
content: Hello guys, so which one would you recommend? This one Fnirsi 2C53T or Zoyi ZT703S? Or something else?For example tutochkin claims he owns both, maybe he could recommend from his own experiences?Thanks a lot.Lukas

author: tutochkin
author_rank: Contributor
timestamp: December 09, 2024, 06:30:29 pm
content: QuoteBoth devices have disadvantages, and the disadvantages are different, even if they belong to the same group. For example, there is a problem with synchronization (trigger). The 703rd failed to stabilize the signal several times in AUTO mode, and the 59th, on the contrary, did not give out problems with AUTO, but it did not always catch a single signal.The 703 has many updates, but they are not always useful. Some of the problems are removed, but some remain and some new ones are added. Which will have to be found and taken into account. 59, on the contrary, has no updates (in the experience of 29, updates sometimes made the device faulty).The battery (operating time) of the 703 is better (longer). They take the same time to charge.To the question "Which one to choose from these two", I will answer "the one that is cheaper". Because in any case, you will have to get used to it and take into account the specifics, but at least you will not spend so much.The signal generator for both devices is just a name. But it is convenient to use it at 53.I use 53 more often (almost always). But that's just my opinion.https://youtu.be/1E0RQBMMkVQhttps://youtu.be/LcKuXdneQoM

author: Rainwater
author_rank: Regular Contributor
timestamp: February 07, 2025, 11:45:34 pm
content: Been playin with mine for a few days, and unfortunately, i got nothing good to say about it.Amazon has rejected my review twice and the manufacturer has not responded to any emails.Im about to return it.Software version 1.0.6Just playing with the vertical position will lock the gui.It happens only a few times when hooking the ch1 probe tip to the dds positive.But if you clip the grounds together.(Probe ground to dds ground) It is matter of seconds before I lose ch1 trace.And shortly afterwards the scope locks up and i have to perform a small button restart.Dont know why or how but im saving up for a real scope, even if it is 4 times the price

author: tutochkin
author_rank: Contributor
timestamp: February 08, 2025, 11:18:31 am
content: Interestingly, the firmware on the website is 1.0.4.https://www.fnirsi.com/pages/manuals-firmwareshttps://www.mediafire.com/file/124kejdy7wo5s19/APP_2C53T_V1.0.3_240814.bin/file

author: Rainwater
author_rank: Regular Contributor
timestamp: February 08, 2025, 12:33:37 pm
content: So the manufacturer got back to me on the no trace issue and it looks like it has fixed the restart issue to.(fingers crossed). The unit needed recalibration and firmware downgrade.But the dds doesnt respond to low frequencies well.Below 20hz produces inaccurate frequencies, some values work, some produce higher frequencies.This short clip demonstrates the issue.https://youtu.be/Dlr0zjP4cno?t=270Quoteall i could find was 1.0.3. The link you provided is for that version aswell

author: tutochkin
author_rank: Contributor
timestamp: February 08, 2025, 04:11:51 pm
content: Sorry, I made a mistake.It's just that you have written "Software version 1.0.6", but there is no such thing on the website, and this surprised me.

author: tutochkin
author_rank: Contributor
timestamp: May 08, 2025, 11:25:45 am
content: 2C53T Firmware V1.0.7 (latest).binhttps://cdn.shopify.com/s/files/1/0694/8310/2426/files/APP_2C53T_V1.0.7_241205.bin?v=1744111377What changed and corrected do not write unfortunately

author: CJSouthern
author_rank: Newbie
timestamp: October 03, 2025, 02:40:24 am
content: Quote from: ee00 on November 23, 2024, 04:24:46 amI struck this too. It goes into this mode if one long-presses the auto button. This mode auto-calibrates the device - and needs to have both probes disconnected to be able to ascertain baseline measurements.It knows if the probes aren't disconnected (probably due to the level of signal it's sensing) and thus waits (and waits and waits) for them to be disconnected - at which point it then continues with the autocalibration (which takes about a minute).So the 2 best solutions are probably:1. Avoid long-pressing the auto button and2. If one does long-press the auto button and enters the calibration routine then just disconnect the probes and wait a minute for it to complete.Not necessarily a great design IMHO, but it is what it is. Hope this helps someone.