Please turn off "Stable Volume" in the video playback setting (the first menu item after clicking the gear icon) as for some reason, this new UA-cam playback feature made the video much noisier than usual.
Actually, quite impressive for this unit. First I thought they were handling everything on the ARM and was wondering how the heck it could be so fast, but that FPGA/or PL is quite powerful to have that many LUTs in it.. wow.. thanks Kerry
Love your detail explanation during the teardown. Appreciate the opportunity to learn and improve myself from your expertise. From your other video of this unit convinced me to get this scope. Awesome 👍
I wanted to make the purchase. But had a doubt about the internals of the HDS272S. To be honest, I didn't except for the internals of a handheld oscilloscope at this price to be this good. Thanks for the awesome and detailed teardown video. Huge like from me..
Thank you for teardown. My unit bought at the very same source on 4th of September has been arrived yesterday. It has the very same board inside and very same software version like yours. So far I like it anyway.
@@KerryWongBlog This is a great meter but i got a problem with mine when in diode reading mode its ok when reading diode but if i short out the probes its switches to ohms mode crashes and in order to recover it i have to chage to voltage of current reading.
Hello, can you use the multimeter leads to input and see the sinewave from an electrical socket? I've been searching everywhere for this answer as i'm new to oscilloscopes.
No, the DMM section is completely separated from Oscilloscope section and can only measure voltage counts. You can just use the probe (in position 10x !) on the ac socket. But be aware, there are several rules to check before, as mentioned in the manual. So for example don't connect any other devices as USB charger or computers because they will have an own ground connection. Use fully isolated probes with proper voltage declaration. AC outlet measurement is very dangerous and not a job for oscilloscope noobs in my opinion.
I would suspect that the current draw varies with the back light intensity, is that function adjustable? Also can the unit be powered from the charger, so it can be used while charging, when the batteries are discharged ?
Thank you for your detailed teardown. I own the HDS242 and my unit shows a significant DC offset of 1,5V at the 5V range. This offset is drifting temperature related. When calibrated in properly warm status, everything is fine. But I can't always wait 15min to run it completely cold to warm before measurement. Is there any component to be better cooled, to get rid off this DC offset drift? For example the 8pin multi OP amp lower right under the display? Thanks in advance.
Unfortunately my HDS272 consumes more than 3mA when not active. Far away from some µA you tested. When I dont use the scope for weeks, accus are empty. I refuse to drill a hole for switch :) I don't know whether I would buy it again. The Firmware is 1.5.0, it seems that there is no update available.
Hello'. Thanks for the video. I have a question and it maybe stupid, why when you measured current consumption at the video beginning you used only one battery?
Thanks for the video. I bought the hds272s. Lately when the power button is pushed, the lcd display streaking vertical and horizontal lines. Can you assist as to the cause and how it can be rectified. Thanks.
@@daviddirac5942 Wondering if the LCD zebra strip somehow did not make good contact with the LCD or the circuit board? What do you mean when you say you don't have connections to all the inputs? Does the DMM/Osc work?
@@daviddirac5942 Well, it would be hard to do the diagnostics over comments, but it sounds like the problem goes beyond just the LCD connection as the DMM inputs and Osc inputs are separate and independent when neither works I'd assume something more serious is going on. Do you remember what was the measurements you did prior to this happening?
Where are those 2 fuses? I see the big one, guessing its the 10A, but where is the one for 200mA. I also checked manual, but the is not a single word about how to changed a fuse.
@@KerryWongBlog Thank you for the response! I only watched it on phone, too small to see it. I guess it's the yellow part, I can red an "F" printed on the circuit board. So the fuse is not replaceable without soldering, I guess. Is that some kind of normal? I don't like this somehow.
Argh, you scratched the LCD. i knew it was going to happen when you flipped it. always put some plastic film or card under LCD's when flipping over to protect the glass.
Please turn off "Stable Volume" in the video playback setting (the first menu item after clicking the gear icon) as for some reason, this new UA-cam playback feature made the video much noisier than usual.
Actually, quite impressive for this unit. First I thought they were handling everything on the ARM and was wondering how the heck it could be so fast, but that FPGA/or PL is quite powerful to have that many LUTs in it.. wow.. thanks Kerry
Love your detail explanation during the teardown. Appreciate the opportunity to learn and improve myself from your expertise. From your other video of this unit convinced me to get this scope. Awesome 👍
I wanted to make the purchase. But had a doubt about the internals of the HDS272S. To be honest, I didn't except for the internals of a handheld oscilloscope at this price to be this good.
Thanks for the awesome and detailed teardown video. Huge like from me..
Thank you for teardown.
My unit bought at the very same source on 4th of September has been arrived yesterday.
It has the very same board inside and very same software version like yours.
So far I like it anyway.
Thanks for all your time and effort, I think is an excellent equipment for a lot of applications ( specially in mobile industry)
I usually laugh those handheld scopes off as toys. It's nice to see a Chinese manufacturer making a good one that is not priced like a Fluke.
Nice Teardown ive ordered this same scopemeter and awaiting its arrival.
Great! Enjoy!
@@KerryWongBlog This is a great meter but i got a problem with mine when in diode reading mode its ok when reading diode but if i short out the probes its switches to ohms mode crashes and in order to recover it i have to chage to voltage of current reading.
@@MrFixiit Interesting. Hope the issue is limited to the DMM mode.
Awesome as always Kerry!
Thanks for taking your time to show this.
Patrick
I bought one HDS242s for use with my curve tracer only.
This is a very good option if you are in budget.
thank you for showing what's inside these. I appreciate the effort you went to. 👍
Hello, can you use the multimeter leads to input and see the sinewave from an electrical socket? I've been searching everywhere for this answer as i'm new to oscilloscopes.
No, the DMM section is completely separated from Oscilloscope section and can only measure voltage counts. You can just use the probe (in position 10x !) on the ac socket. But be aware, there are several rules to check before, as mentioned in the manual. So for example don't connect any other devices as USB charger or computers because they will have an own ground connection. Use fully isolated probes with proper voltage declaration. AC outlet measurement is very dangerous and not a job for oscilloscope noobs in my opinion.
HDS2102S was released. Any chance you'll review/tear down that model too?
I would suspect that the current draw varies with the back light intensity, is that function adjustable? Also can the unit be powered from the charger, so it can be used while charging, when the batteries are discharged ?
Thank you for your detailed teardown. I own the HDS242 and my unit shows a significant DC offset of 1,5V at the 5V range. This offset is drifting temperature related. When calibrated in properly warm status, everything is fine. But I can't always wait 15min to run it completely cold to warm before measurement.
Is there any component to be better cooled, to get rid off this DC offset drift? For example the 8pin multi OP amp lower right under the display?
Thanks in advance.
Install a fan
Unfortunately my HDS272 consumes more than 3mA when not active. Far away from some µA you tested. When I dont use the scope for weeks, accus are empty. I refuse to drill a hole for switch :) I don't know whether I would buy it again. The Firmware is 1.5.0, it seems that there is no update available.
Cheers !
385-12 is a voltage regulator not a memory chip
Hey
Have you measured the operating temperatures of the main chips of this device? Are they overheating as it happens on stationary oscilloscopes?
That's a great suggestion. I too would be curious to see if possible. thanks for suggesting. 👍
The HDS272S battery runs out too fash when on.
i am thinking of buying this HDS272S. Do the 2 18650s come with it or do you need to use your own?
nice video...im not brave enough to disassembly a new instrument nearly buyied...
Hello'. Thanks for the video. I have a question and it maybe stupid, why when you measured current consumption at the video beginning you used only one battery?
The two batteries operates in parallel and it's far easier to measure one current path than using two meters and add the results together.
Thanks for the video. I bought the hds272s. Lately when the power button is pushed, the lcd display streaking vertical and horizontal lines. Can you assist as to the cause and how it can be rectified. Thanks.
Does the streak persist when the scope is on?
@@KerryWongBlog Thanks. Yes , it persists. I have no connections to all the inputs.
@@daviddirac5942 Wondering if the LCD zebra strip somehow did not make good contact with the LCD or the circuit board? What do you mean when you say you don't have connections to all the inputs? Does the DMM/Osc work?
@@daviddirac5942 Well, it would be hard to do the diagnostics over comments, but it sounds like the problem goes beyond just the LCD connection as the DMM inputs and Osc inputs are separate and independent when neither works I'd assume something more serious is going on. Do you remember what was the measurements you did prior to this happening?
Where are those 2 fuses? I see the big one, guessing its the 10A, but where is the one for 200mA. I also checked manual, but the is not a single word about how to changed a fuse.
The fuse for the lower current range is a polyfuse, if you take a look at my teardown pictures you will see it's right next to the mA socket.
@@KerryWongBlog Thank you for the response! I only watched it on phone, too small to see it. I guess it's the yellow part, I can red an "F" printed on the circuit board. So the fuse is not replaceable without soldering, I guess. Is that some kind of normal? I don't like this somehow.
@@M_B_80 Since the fuse is resettable, it doesn't really need to be replaced.
@@KerryWongBlogYeah ... today I learned something 😁I didn`t know something like that exists. Thank you! It was my fault!
The power botton is not work why
Argh, you scratched the LCD. i knew it was going to happen when you flipped it. always put some plastic film or card under LCD's when flipping over to protect the glass.
Hello. it can write data stream to internal memory