Rigol HDO1000 and HDO4000 12bit oscilloscopes launched in China

[thm_w]

The DC accuracy of all 4 channels is within the 2% specification. However, at low frequencies CH1 reads about 4% lower than other channels. For example, with all probes x1 connected to scope comp output, hit Default then AUTO. All 4 traces overlay perfectly. Switch to x10, hit AUTO. CH1 very obviously different, showing 4% lower amplitude than other channel traces (with probes on x10 the input channel relays have switched to the lower input range).

Do your traces overlay perfectly in that setup?

On 1x everything perfectly overlaid, then on 10x, my CH4 is the only one visibly off, by about 2% or so. Used 32x average to make it more obvious.

I found a "Performance Verification Manual", by the way -- only by chance, and only on the ManualsLib site; could not spot it on any Rigol site. Mildly interesting, I'd say: https://www.manualslib.com/manual/3029727/Rigol-Dho1000-Series.html#manual

Funny, as the calibration test sheet I posted only used some relatively basic rigol gear (DM3068, DG1000Z and DSG830), whereas this performance verification is using high end Fluke gear.

[Noy]

Sorry double post with DHO800 thread..

I'm in trouble..
Should i get a DH804 (hacked) or a DHO1074 mated to my MSO5354?
I know there is the discount for the DHO1074 currently, but still then it is nearly 1/3 more on top..

And my desk is space limited.. The size of the DHO804 is really nice / fitable ..
And i think it is enough for a MSO5k addition..? I only need / would like to have it for power supply checking / using with my current clamps..
The stuff where 12bit are nice (but do i really need it ?? )... For my main work (mostly digital stuff) i like the >350MHz BW / 8GS.

[ebastler]

Sorry double post with DHO800 thread..
I'm in trouble..

To make sure you don't get into more trouble, please don't double-post. 
Your question has already received several answers in the other thread, so let's continue the discussion there (only).

[core]

Sorry double post with DHO800 thread..

I'm in trouble..
Should i get a DH804 (hacked) or a DHO1074 mated to my MSO5354?
I know there is the discount for the DHO1074 currently, but still then it is nearly 1/3 more on top..

And my desk is space limited.. The size of the DHO804 is really nice / fitable ..
And i think it is enough for a MSO5k addition..? I only need / would like to have it for power supply checking / using with my current clamps..
The stuff where 12bit are nice (but do i really need it ?? )... For my main work (mostly digital stuff) i like the >350MHz BW / 8GS.

I have both DHO1074 and MSO5000.

What advantages would a DHO (800 or 1000) have over the MSO:

- DHO interface is better designed for touch screen, also multiple windows looks much better when you want to see multiple math functions simultaneously. See the posts above.
- the input noise is much lower, and for checking the noise of power supplies it is a much better option. Below 20mV/div can't even be compared.
- power consumption is much lower, but fan noise is comparable. The DHO1000 is even noisier than the MSO.

Otherwise the DHO does not make much difference compared to the MSO. It just complements it with the above. Same advanced features, no noticeable improvements.

The differences between DHO800 and DHO1000 are mainly related to size, available memory, sampling rate, and somewhat computing power. The software is pretty much the same. If you can afford it, the current price offer for the DHO1000 is unbeatable. Otherwise, or if you really want it to take up as little space on your desk as possible, you'll be fine with the DHO800.

You will not really need it if MSO it's already fine for you, but it's nice to have one 

[Noy]

Thanks for this answer..
Hmm i think there is no advantage above my very old Hameg HMO3524..
It has a noise of around 60-70µV RMS which is less than half of the MSO5k 150µV.. both with open channels and 1ms / 1mV
And i think near to a DHO800?
And the Hameg has 50Ohm internal with 350MHz.. So only 12bit are left as "advantage"..

PS: I don't like touch :-D i prefer single knobs for every channel that was one thing why i choose MSO5K above the Siglent..

[ebastler]

You might have enough scopes. 
Is it an option not to buy any new one right now?

[Noy]

Sure not buying another one is an option...(the preferred one of my wife ;-) )
But i got some money (tax refund and a salary increase) and i can use it for my tax report 2023 in germany (homeoffice advertising payback) and get partly a refund for it..

And i thought i could buy something which will improve my work in future (12bit vs 8 bit for switching regulator checking, current measuring on USB stuff (CP2100A has only 10A / 100A range which is a bit high for USB current stuff but it works..)..)..

But i think you are right it will not be a huge improvement maybe i should save the money for something "more usefull thing"..

[core]

Thanks for this answer..
Hmm i think there is no advantage above my very old Hameg HMO3524..
It has a noise of around 60-70µV RMS which is less than half of the MSO5k 150µV.. both with open channels and 1ms / 1mV
And i think near to a DHO800?
And the Hameg has 50Ohm internal with 350MHz.. So only 12bit are left as "advantage"..

PS: I don't like touch :-D i prefer single knobs for every channel that was one thing why i choose MSO5K above the Siglent..

If you already own an oscilloscope with less noise than the MSO, and the touch screen means nothing to you, you can save your money for something else.
12 bits versus 8 bits is not a huge difference for regular measurements. It might be if more advanced math functions were available.

[radur]

I literally just registered to say this is on a 40% sale https://rigolshop.eu/dho1074.html I got it for like 15% sale 
Hope I don't bother anyone with this message

[skander36]

I literally just registered to say this is on a 40% sale https://rigolshop.eu/dho1074.html I got it for like 15% sale 
Hope I don't bother anyone with this message

There is 40% from normal price which is 1188E. So you can buy it at 712,81E. You get other price?

[radur]

I got it in October 

[ojete]

You are too fast. I bought mine from batterfly with the 40% + another 10%, I have received it today.
With the german vat it would be 641€.

[TurboTom]

Congratulations, that was really a great deal that you got there!

[egonotto]

Hello,

my DHO1074 has Utility -> About -> Hardware: 2 and had firmware 00.02.04.
If I remember correctly, I have seen a DHO1074 with Hardware: 9 in a YouTube video.
What kind of Utility -> About -> Hardware: do you have?

Best regards
egonotto

[TurboTom]

As far as I understood, the HW 9 was on a 2-channel model (DHO1072). All the 4 channel models from the lastes bargain sales that I know of are HW 2.

[thm_w]

I have Hardware: 3. DHO1074. Date of calibration was 2022/10/15.

[Veteran68]

I have Hardware: 3. DHO1074. Date of calibration was 2022/10/15.

Interesting. My DHO1074 has Hardware: 2 with a calibration date of 2022/10/19. So 4 days after yours, but prior HW version. I wonder if calibration happens at the end of the assembly line, or if completed units are stocked away and calibrated later.

I suspect they have multiple HW revisions with slight variations based on the components they can source at a given time, so probably have multiple revisions coming through their factory/warehouses. Yours is the first I've seen/heard of as revision 3.

[core]

I accidentally compared some screenshots and noticed that the latest firmware version has significantly more noise.
I have attached the comparison between 02.04 and 02.12.

Inputs have 50 Ohm terminators.

Can anyone check if they got the same result?

[gf]

I accidentally compared some screenshots and noticed that the latest firmware version has significantly more noise.
I have attached the comparison between 02.04 and 02.12.

Presuming that the settings (and especially Averaging, HiRes) are the same, my first thought would be that the noise bandwidth could have changed (different digital? filtering, maybe implied hidden HiRes in the old version?). So I would look at the FFT and compare the noise power spectral distribution between the two versions.

[ebastler]

Can anyone check if they got the same result?

Is it possible to go back to older firmware versions, or did you just happen to have a saved screenshot which showed the old version info and its noise?

[core]

Can anyone check if they got the same result?

Is it possible to go back to older firmware versions, or did you just happen to have a saved screenshot which showed the old version info and its noise?

Now I am with old firmware and the noise is back at low level.
I will try some FFTs with 02.04 and then the same tests with 02.12.

I'll be back 

[core]

I have measured several configurations.
I've installed 02.04 -> calibration -> measurements. Same for 02.12. Now there are lower values for DC offset.

I've set 1mV/div, 1ms/div, using 1Mpts/10Mpts deep memory.
From 10Mpts up there are no difference in measurements and FFT plots.

The noise levels for measurements without filters are identical.

For 02.04, the FFT level at 20 Mhz BW is about 12dB lower than the level for full BW.
For 02.12, the difference is about 8dB.

It seems that the filter for 20 Mhz has been changed.

I'll be back with some interesting captures regarding HiRes.

[core]

I've forgot these ...

[core]

It appears that the order in which the 20MHz and Hires filters are applied it matter. It can be seen on the attached FFT plots.

The HiRes filters are identical for both FW versions, I will attach them for 02.12 only.

If HiRes is applied first, then 20MHz, the effect is clear.
But if 20MHz is applied first and then HiRes, the latter has no effect on the FFT.

Below I have attached for all combinations:
- Just Hires14
- Hires14, then 20MHz
- 20MHz, then Hires14

Same for Hires16.

For Hires14, only low freq response is changing. For HiRes16 all the freq are going down. Interesting, for me at least 

Later edit : even when the order is HiRes -> then 20MHz, then you change back HiRes to Normal, the effect persist like the HiRes is still active. So it may be a bug ...

[egonotto]

Hello,

the noise values on my device change for no apparent reason.

Best regards
egonotto