Rigol's New DHO800 Oscilloscope unbox & teardown

[Mechatrommer]

Still can't figure out howto upgrade my DHO914S into DHO924S....
Had a DHO800 upgraded to DHO924 but can't know for this extended version. Any help appreciated.

You need a vendor.bin for DHO924S.
(you can make your own using the script that's floating around)

specificity is much more helpful, here i pin locked among the most important info, not sure if its still applicable (any hack related discussion should be there fwiw)
https://www.eevblog.com/forum/testgear/hacking-the-rigol-dho800900-scope/msg5254071/#msg5254071 or the another...
https://www.eevblog.com/forum/testgear/hacking-the-rigol-dho800900-scope/msg5148330/#msg5148330

[Houseman]

Still can't figure out howto upgrade my DHO914S into DHO924S....
Had a DHO800 upgraded to DHO924 but can't know for this extended version. Any help appreciated.

You need a vendor.bin for DHO924S.
(you can make your own using the script that's floating around)

specificity is much more helpful, here i pin locked among the most important info, not sure if its still applicable (any hack related discussion should be there fwiw)
https://www.eevblog.com/forum/testgear/hacking-the-rigol-dho800900-scope/msg5254071/#msg5254071 or the another...
https://www.eevblog.com/forum/testgear/hacking-the-rigol-dho800900-scope/msg5148330/#msg5148330

Thank You so much. I had the ability to successfully upgrade my old DHO804 into 924 using ready-to-use fungus method explained here at reply #111 but when I got the 914S in my hands I was afraid that upgrading it to upper bandwidth with same method I would loose the native S feature..
By the way during upgrade and revert to original 804 I had to manually hard reset the oscope by plugging out the powercord (even with the alert on his thread) since the adb reboot option didn't work for me in either phases.. The oscope was freezed durning reboot and even after 15minutes it was still hung in the middle of nowhere.. And that was some really panic moments, expecially the first time.
And also I have lost the thread discussion update since then ( from reply 111 to 1950) wow it's a growth..
Thanks for the help and the link

[Fungus]

By the way during upgrade and revert to original 804 I had to manually hard reset the oscope by plugging out the powercord (even with the alert on his thread) since the adb reboot option didn't work for me in either phases..

Yeah, I don't think reboot syncs the file system. I've had a couple of fails with that.

You can do do "adb sync" before reboot but these days I do this:

Code: [Select]

adb shell kill -9 $(pidof com.rigol.scope)
That kills the 'scope app.

It comes back automatically after a few seconds as the new model, it's much faster than rebooting.

(nb. You need to be root, do "adb root" if you aren't already)

[shapirus]

Has someone found a bag/case for the scope that would be just right size-wise and ideally having internal compartments for the PSU and probes?

I know that there is some rigol-branded bag made specifically for this scope, but I'm looking for what's available specifically on Aliexpress -- ordering elsewhere is currently non-viable logistics-wise for me.

Here's two that I've found so far that seem to be the best:

https://www.aliexpress.com/item/33004483750.html -- bigger, has a separated compartment inside, but a little too big, could be smaller:





https://www.aliexpress.com/item/1005006312639453.html -- smaller, cheaper, no separate compartment.




If someone has found something better, please share.

[Houseman]

Has someone found a bag/case for the scope that would be just right size-wise and ideally having internal compartments for the PSU and probes?

I know that there is some rigol-branded bag made specifically for this scope, but I'm looking for what's available specifically on Aliexpress -- ordering elsewhere is currently non-viable logistics-wise for me.

Here's two that I've found so far that seem to be the best:

https://www.aliexpress.com/item/33004483750.html -- bigger, has a separated compartment inside, but a little too big, could be smaller:

(Attachment Link)



https://www.aliexpress.com/item/1005006312639453.html -- smaller, cheaper, no separate compartment.

(Attachment Link)


If someone has found something better, please share.

me too even if there is a dedicated thread for the bag here:
https://www.eevblog.com/forum/testgear/rigol-dho800900-case-options/msg5235294/#msg5235294.
Some user suggests a projector case.
I guess Aliexpress can fully comply you needs.
Regards.

[shapirus]

Yeah I didn't realize there was a separate thread, thanks for the hint.
Not much info there, though.

[Randy222]

Needing some teardown info.

Wondering where the fan wires actually terminate? Do they land on just Vcc-Gnd, or do they land on some pins of a chip?
I ask because the rigol start script makes commented reference to fan PWM KLM, but the ko is not in the GEL FW set.

Code: [Select]

# 加载 PWM Fan 驱动
# insmod /rigol/driver/pwm_fan.ko
# chmod 777 /dev/pwm_fan

I confirm, in the 1000/4000 GEL they enable PWM FAN and it includes the KLM pwm_fan.ko binary.

I suspect 800/900 does not have pwn chip used for pwm, but I don't know 100%.

I will take the 1000/4000 KLM ko and put it on my 804, adjust start script, and see what happens.

Some strings from the pwm_fan.ko

Code: [Select]

pwm-fan
license=GPL
description=PWM FAN driver
alias=platform:pwm-fan
author=Kamil Debski <k.debski@samsung.com>

[shapirus]

-3db bandwidth measurement:



(spoiler: better than advertised; measures over 300 MHz)

[norbert.kiszka]

(spoiler: better than advertised; measures over 300 MHz)

Bit surprise for me, because I was expecting way more. It has same input stages as in DHO4000. Maybe it was limited by capacitor (different value than DHO4000) or by ADC.

Or... maybe its a generator/coax fault of author of that test.

[shapirus]

Bit surprise for me, because I was expecting way more. It has same input stages as in DHO4000. Maybe it was limited by capacitor (different value than DHO4000) or by ADC.

Or... maybe its a generator/coax fault of author of that test.

Rise time measurements also indicate max bandwidth on the order of ~300 MHz.

[norbert.kiszka]

Rise time measurements also indicate max bandwidth on the order of ~300 MHz.

DHO800 and DHO900 series has 1.25 GSa/s sample rate. That means one sample per 0.8 ns. 300 MHz is equal to rise time of 1.1(6) ns (about one and half sample time). So its practically impossible to make precise measure of rise time in this scope.

[Fungus]

I measured ~280Mhz on my DHO804 with a DHO924 vendor.bin.

[shapirus]

I measured ~280Mhz on my DHO804 with a DHO924 vendor.bin.

Which method? -3db amplitude?

[Fungus]

I measured ~280Mhz on my DHO804 with a DHO924 vendor.bin.

Which method? -3db amplitude?

Pulse.

But other forum members have done -3dB and got the same results.

[Aleksandr]

Here is a link to increasing the frequency to 400 MHz; replacing inductors expands the band. https://4pda.to/forum/index.php?showtopic=1080959#entry128030525 Post №21-30.

[norbert.kiszka]

Here is a link to increasing the frequency to 400 MHz; replacing inductors expands the band. https://4pda.to/forum/index.php?showtopic=1080959#entry128030525 Post №21-30.

Google translate doesnt helps well. I see on images LC filters, so Im guessing I should change inductors to 0 ohm resistor and maybe remove capacitors.

[Aleksandr]

Here is a link to increasing the frequency to 400 MHz; replacing inductors expands the band. https://4pda.to/forum/index.php?showtopic=1080959#entry128030525 Post №21-30.

Google translate doesnt helps well. I see on images LC filters, so Im guessing I should change inductors to 0 ohm resistor and maybe remove capacitors.

It is enough to replace the blue inductors with inductors with a nominal value of 12-15 nH.

[norbert.kiszka]

It is enough to replace the blue inductors with inductors with a nominal value of 12-15 nH.

I know sample rate will be the same but higher bandwidth (frequency) will make possible to see properly square waves at higher frequency (1/10 - 1/5 of bandwidth).

[ebastler]

I know sample rate will be the same but higher bandwidth (frequency) will make possible to see properly square waves at higher frequency (1/10 - 1/5 of bandwidth).

But only in single-channel mode. As soon as you use a second (or even a third) channel, aliasing will result because the sampling rate no longer meets the Nyquist requirement.

It will also not be trivial to properly feed the signal into the scope, given that the input section offers no internal 50 Ohm termination. So to "properly see" that fast-edged square wave, and e.g. know whether any ringing you see (or don't see) is real or due to your probing technique, will be a challenge.

[Mechatrommer]

no if you have 50 ohm bandwidth limiter at the dso input

[shapirus]

It will also not be trivial to properly feed the signal into the scope, given that the input section offers no internal 50 Ohm termination. So to "properly see" that fast-edged square wave, and e.g. know whether any ringing you see (or don't see) is real or due to your probing technique, will be a challenge.

It is actually the case as it is, at the existing max ~300 MHz BW: fast edges produce significant overshoot and ringing when using a probe, potentially making the scope calculate the actual rise time incorrectly, even when the spring ground connection is used, and they disappear to leave a nice clean edge when even a simple termination via a T-connector is done (an inline feed-through terminator may be even better -- I don't yet have one to check).

[zelea2]

Has someone found a bag/case for the scope that would be just right size-wise and ideally having internal compartments for the PSU and probes?

This is what I've got for my scope for 17$ delivered to UK:
https://www.aliexpress.com/item/1005005213947242.html (select large size)
Size-wise I'd say it is a perfect fit, it has space for the power supply, mains cable + 4 probes.
The case is reasonably hard but the screen will not survive if you bang it against a hard corner or if you place a heavy object on it.
I will probably add inside a layer of foam just to cover the LCD.

[MalikovVV]

Wanbo X1 Max

[profrook]

Just quick question, anyone with root access tried to change DPI in Android on these devices?

[Randy222]

Just quick question, anyone with root access tried to change DPI in Android on these devices?

DPI of the DHO touchscreen? I think that was attempted in the hacking thread, IIRC no real gains.
I believe the driver for the touchscreen uses "max dpi" of the device (screen).