Author Topic: FNIRSI-1013D "100MHz" tablet oscilloscope  (Read 33638 times)

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Offline Fungus

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Re: FNIRSI-1013D "100MHz" tablet oscilloscope
« Reply #300 on: July 20, 2020, 02:30:13 pm »
Did anyone check if it was capable of 100Mhz?

Yes.

Or where its limit is?

More like 20-30MHz
 

Offline Fungus

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Re: FNIRSI-1013D "100MHz" tablet oscilloscope
« Reply #301 on: July 20, 2020, 02:31:07 pm »
Has anybody measured the bandwidth in 1x mode?

 

Offline rhb

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Re: FNIRSI-1013D "100MHz" tablet oscilloscope
« Reply #302 on: July 20, 2020, 03:37:10 pm »
The lack of a variable gain amplifier limits them pretty significantly.  The Rigol had to change ranges quite a few times for the plot I posted.

My DSO testing has found that all of the ones I've tested alias because the filter is before the variable gain amplifier.  While undesirable in certain circumstances, it does mean they are usable to 3-4x they -3 dB point for tasks like troubleshooting an RF system.

Have Fun!
Reg
 

Offline cliffyk

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Re: FNIRSI-1013D "100MHz" tablet oscilloscope
« Reply #303 on: July 20, 2020, 03:47:54 pm »
I was raised to believe that a man's word was his bond.
That has NEVER been true.

Perhaps not in your circles...

Bingo!

I was going to respond "Never been in a firefight, have you?". When you tell a brother you "have his back", YOU HAVE HIS GODDAMN BACK!

You'll need him to do the same for you someday...
-cliff knight-

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Offline Martin72

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Re: FNIRSI-1013D "100MHz" tablet oscilloscope
« Reply #304 on: July 20, 2020, 03:50:29 pm »
Hi,

Mine did arrived - Ordered as fnirsi, it comes a "yeapook"... ;)
First look, cute toy, responsive touchscreen...


Offline Fungus

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Re: FNIRSI-1013D "100MHz" tablet oscilloscope
« Reply #305 on: July 20, 2020, 03:56:41 pm »
I was going to respond "Never been in a firefight, have you?". When you tell a brother you "have his back", YOU HAVE HIS GODDAMN BACK!

I don't think it's a bad thing to have been raised with the phrase "Caveat Emptor" burned into the psyche.

 

Offline cliffyk

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Re: FNIRSI-1013D "100MHz" tablet oscilloscope
« Reply #306 on: July 20, 2020, 04:06:33 pm »
Has anybody measured the bandwidth in 1x mode?

Didn't read the entire thread did you?

Here're my results, a couple others checked it as well:

Here are some results of my testing bandwidth in X1 mode using alligator clips:

10kHz reference (5.04 Vpp):


1 MHz (4.99 Vpp -0.087 dB)


10 MHz (5.39 Vpp +0.58 dB)


20 MHz (4.99 Vpp -0.087 dB)


30 MHz (4.36 Vpp -1.26 dB)


34 MHz (3.47 Vpp -3.24 dB)


So, there it is -3 dB @ 33 to 34 MHz with alligator clips! Not too shabby,,,

Note that the square-wave on CH2 (X1 mode via a 50 Ω patch cable) turned to crap at > 10 MHz, which actually validates the 30+ MHz bandwidth...

-cliff knight-

paladinmicro.com
 
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Offline cliffyk

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Re: FNIRSI-1013D "100MHz" tablet oscilloscope
« Reply #307 on: July 20, 2020, 04:09:26 pm »
I was going to respond "Never been in a firefight, have you?". When you tell a brother you "have his back", YOU HAVE HIS GODDAMN BACK!

I don't think it's a bad thing to have been raised with the phrase "Caveat Emptor" burned into the psyche.

Oh, we had that one too.

if you read the entire thread you will find that I and others have been generally please with the value of the unit--nonetheless it is grossly misrepresented..
-cliff knight-

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Offline tv84

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Re: FNIRSI-1013D "100MHz" tablet oscilloscope
« Reply #308 on: July 20, 2020, 04:13:18 pm »
For example, 0xb34e() has an infinite loop following a series of function calls suggesting that it is the main loop when the DSO is running.  However, I can't figure out how to walk back up the call tree from there.

I'm certainly impressed by Ghidra.  I had not known of it before, so it's been a very valuable education.  I can see lots of uses for it, but I think I need to start by analyzing a less complex program.

As Morpheus would say: Welcome to the real world.
 

Offline cliffyk

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Re: FNIRSI-1013D "100MHz" tablet oscilloscope
« Reply #309 on: July 20, 2020, 04:22:42 pm »
Hi,

Mine did arrived - Ordered as fnirsi, it comes a "yeapook"... ;)
First look, cute toy, responsive touchscreen...

I have found the UI will get sluggish in "Normal" trigger mode in the absence of, or with a maladjusted trigger--switching to "Auto" mode frees it all up.

Check out the "Save Wave"/"View Waveform"  functions. When viewing a saved wave ("wave", not "pic") you can alter gain and time base, and scroll up/down/sideways, to view the entire capture. Measured parameters, cursors anf the FFT function (such as it is) work as well. I wish my Lecroy allowed that. 
-cliff knight-

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Offline Martin72

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Re: FNIRSI-1013D "100MHz" tablet oscilloscope
« Reply #310 on: July 20, 2020, 04:24:17 pm »
Here're my results, a couple others checked it as well:

Fed in a sinewave with 1Vrms, starting at 1Mhz. Got -3dB (0.707Vrms) at appx 37 Mhz.
Interesting :

Where at frequencies about 10Mhz or more the waveform looks stable, at 1Mhz it´s somekind of "restless" .

Offline cliffyk

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Re: FNIRSI-1013D "100MHz" tablet oscilloscope
« Reply #311 on: July 20, 2020, 04:34:21 pm »
Here're my results, a couple others checked it as well:

Fed in a sinewave with 1Vrms, starting at 1Mhz. Got -3dB (0.707Vrms) at appx 37 Mhz.
Interesting :

Where at frequencies about 10Mhz or more the waveform looks stable, at 1Mhz it´s somekind of "restless" .

Mine tracks and synchs well from the 10 kHz reference I started with, out to the 34 MHz -3dB point I found... But, that's the sort on inconsistency we have all come to expect in this stuff. If they used top notch quality components they could of course not afford the sell it for $165 delivered here in the U.S.

All in all I find I am enjoying it. Did I mention it's as cute as a bug's ear?
-cliff knight-

paladinmicro.com
 

Offline rhb

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Re: FNIRSI-1013D "100MHz" tablet oscilloscope
« Reply #312 on: July 20, 2020, 04:35:21 pm »
For example, 0xb34e() has an infinite loop following a series of function calls suggesting that it is the main loop when the DSO is running.  However, I can't figure out how to walk back up the call tree from there.

I'm certainly impressed by Ghidra.  I had not known of it before, so it's been a very valuable education.  I can see lots of uses for it, but I think I need to start by analyzing a less complex program.

As Morpheus would say: Welcome to the real world.

The real world is a rather large place.  No one lives long enough to visit all of it.

It would be very interesting to know the origins of this.  The obvious presence in the FW of features not supported by the HW suggests someone developed a base design and FW to sell to manufacturers who in turn set the price point by leaving out HW.

The lack of a variable gain amplifier to provide mV ranges is more of a barrier to my getting one than the 30 MHz BW.

Have Fun!
Reg
 

Offline rhb

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Re: FNIRSI-1013D "100MHz" tablet oscilloscope
« Reply #313 on: July 20, 2020, 04:38:28 pm »
The trigger jitter at 1 MHz may be caused by failing to interpolate the trigger point and retime the sampling  Easily fixable once we have control of the FW it's running.

Reg
 

Offline Fungus

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Re: FNIRSI-1013D "100MHz" tablet oscilloscope
« Reply #314 on: July 20, 2020, 04:40:06 pm »
It would be very interesting to know the origins of this.  The obvious presence in the FW of features not supported by the HW suggests someone developed a base design and FW to sell to manufacturers who in turn set the price point by leaving out HW.

Maybe management said "We want a 1GSample/100Mhz 'scope!" and engineering did the best they could.

The would certainly explain the discrepancy between the ADC sample rate and the analog bandwidth - they were aiming higher when they chose the ADC but it didn't work out in production.
 

Offline CDaniel

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Re: FNIRSI-1013D "100MHz" tablet oscilloscope
« Reply #315 on: July 20, 2020, 04:55:57 pm »
Be serious , this is not a company as it should be , just some guys wanting to make easy money lying  ...  ;D
 

Offline Fungus

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Re: FNIRSI-1013D "100MHz" tablet oscilloscope
« Reply #316 on: July 20, 2020, 05:03:41 pm »
Be serious , this is not a company as it should be , just some guys wanting to make easy money lying  ...  ;D

In the west we call those people "managers and salesmen".

There's laws that make it make it difficult to sell products with definite numbers on them though so they mostly stick to homeopathic, gluten-free hairloss remedies that help you sleep and tighten up your abs while you use them. ie. Nothing that can be disproved in a court of law.

(either that or investment-grade "collectables" on the shopping channel that can only go up in value in the future...)

Edit: And then there's the Batteroo brothers.
« Last Edit: July 20, 2020, 05:05:18 pm by Fungus »
 

Offline pascal_sweden

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Re: FNIRSI-1013D "100MHz" tablet oscilloscope
« Reply #317 on: July 20, 2020, 05:07:42 pm »
It would be nice if the software of this device was open sourced. Then one could actually make something useful out of it :)
« Last Edit: July 20, 2020, 05:27:36 pm by pascal_sweden »
 

Offline Martin72

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Re: FNIRSI-1013D "100MHz" tablet oscilloscope
« Reply #318 on: July 20, 2020, 05:26:47 pm »
Some further impressions...
Took the screenshot function, works perfect.
Data transmission to pc was really simple - Connect it to the pc, voilá.
Interesting : You should better disconnect your source from the channels when connect it to the pc, otherwise the waveforms changed to a negative DC voltage on the screen - Isolation problem I guess.
But after playing a bit around:
Cute, really cute toy... :D

Offline rhb

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Re: FNIRSI-1013D "100MHz" tablet oscilloscope
« Reply #319 on: July 20, 2020, 05:58:28 pm »
Be serious , this is not a company as it should be , just some guys wanting to make easy money lying  ...  ;D

The datasheet of  Keysight MSOX3104T states rise time as 0.35/BW *except* for the 1 GHz model.  For that it's 0.45/BW.

That's a $20K MSRP scope.

Reg
 

Offline cliffyk

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Re: FNIRSI-1013D "100MHz" tablet oscilloscope
« Reply #320 on: July 20, 2020, 06:21:41 pm »
Be serious , this is not a company as it should be , just some guys wanting to make easy money lying  ...  ;D

In the west we call those people "managers and salesmen".

There's laws that make it make it difficult to sell products with definite numbers on them though so they mostly stick to homeopathic, gluten-free hairloss remedies that help you sleep and tighten up your abs while you use them. ie. Nothing that can be disproved in a court of law.

(either that or investment-grade "collectables" on the shopping channel that can only go up in value in the future...)

Edit: And then there's the Batteroo brothers.

"Franklin Mint" comes to mind...
-cliff knight-

paladinmicro.com
 

Offline Fungus

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Re: FNIRSI-1013D "100MHz" tablet oscilloscope
« Reply #321 on: July 20, 2020, 07:05:44 pm »
"Franklin Mint" comes to mind...

Yeah, that's the one.

At least FNIRSI is giving you something in return for your money.
 

Offline Fungus

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Re: FNIRSI-1013D "100MHz" tablet oscilloscope
« Reply #322 on: July 20, 2020, 07:13:51 pm »
Has anybody measured the bandwidth in 1x mode?

Didn't read the entire thread did you?

Wait a minute...

That measurement was with "alligator clips". I was interested in the bandwidth with the 1x probes. The 1x probes will have some capacitance that will lower the bandwidth.

If we have to use crocodile clips to get the most from this thing then there should be a way to get better results by adding a small amount of capacitance and limiting the bandwidth to something the system can handle.

(ie. not exploding into a mess of aliasing when you go over 50MHz).


« Last Edit: July 20, 2020, 07:22:14 pm by Fungus »
 

Offline Martin72

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Re: FNIRSI-1013D "100MHz" tablet oscilloscope
« Reply #323 on: July 20, 2020, 07:53:12 pm »
Hi,

Done the meausure with the probe switching to 1x.
BW decreases to 17.8Mhz
Martin
 
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Offline tv84

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Re: FNIRSI-1013D "100MHz" tablet oscilloscope
« Reply #324 on: July 20, 2020, 08:20:23 pm »
Cute, really cute toy... :D

Have you used it with your Siglent board?
 


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