Indeed are not expensive. I found a 2watt 2pk for $20, vswr to 1GHz looked good by some who had posted pics of their testing, but I will test them too before use. I'll test w/ and w/o a 1meg terminator on end of the feed thru.

@nsaspook, as a side note, did you happen to grab a -3db on your 814? I seen some vids where it's near 180MHz, but would be nice to see if you get the same.

Nope, it's not on my list of things to do.

 

After careful consideration of my scope needs, an 804 has been shipped to me.

 

My DHO804 has been ordered as well, thanks for the review @nsaspook

 

Looks like we have a winner here with the DHO800 series.

Some of the other budget scope suppliers need to step-up.

Siglent SDS800X HD in a budget format?

 

Siglent SDS800X HD in a budget format?
View attachment 309219

Coming Q1 '24 as are SDS1000X HD and SDS3000X HD, all new 12 bit DSO's to complement the existing SDS2000X HD and SDS7000A for a 12 bit range covering all needs and budgets to 4 GHz.

 

The new products are in full swing. Owon has a 4-in-1 14bit scope that also allows you to run python code to test stuff.
My guess is, they all now run Android, because most things are done in software, so I think the "cpu" & ram specs will become front-center. Aka, mini PC's (androids) in a half-sized lunchbox.


https://www.eevblog.com/forum/testgear/siglent-sds800x-hd-12-bit-dsos-coming/

 

I have the OWON bench multimeter. It sits at my desk at work. I like it quite a bit.

 

Just received my newest DHO804 toy! It's perfect! I will be unlocking 100 MHz and 50Mpt

 

Just received my newest DHO804 toy! It's perfect! I will be unlocking 100 MHz and 50Mpt

View attachment 309736

What firmware did it come with?

Also, when you look at the flats of the internal 1kHz, do they look noisy?

 

Firmware version: 00.01.01
the internal 1kHz is very clean.

I believe there were issues with power supply noise in the first units. This one came with the LITEON external power supply. I especially like the FFT. The fan noise isn't too bad but on the higher pitched whiney side.

 

Mine came direct from a china seller, it has the newer 1.01.02 firmware, but from what info I can get on it, a newer rev due to some newer hardware inside the unit which needed a slightly different firmware dated Nov 2023.

The tiny little fan has to have enough rpm's to move any air. I will fix that using an external 90x90 Noctua "silent" fan, along with a vesa mount. I need to 3d print an adapter so it all fits together cleanly.

 

I’m curious to see what the hardware change might be. The official firmware is still 00.01.01 on their website. The Noctua external noctua fan might be the best solution.
This scope will sit at my desk next to my bench dmm at work for quick measurements so I don’t have to get up to go to the lab to fire up the tek or the teledyne.
If I hadn’t just recently purchased an MSO5074 (which is great) I would have gone for the DHO900.

 

The firmware 00.01.02 is in several threads on eevblog site. Some mention the newer built items got some new hardware due to supply chain issues of original design, so basically same functionality using similar but different chips here and there, warranting a slight change in firmware. A user there had suggested the code to calibrate was different. The download piece appears to be non general release because the .02 is for specific newere DHO's, so to avoid the masses downloading the latest and having issue, rigol keeps .02 off of general downloads.

As for the tiny fan cooling the unit, it's a interesting but perhaps not ideal setup. The tiny fan sits in center of that heatsink and is lower than the adjacent fins, this means the fan inlet is picking up already warm air. I am thinking about slowing the tiny fan to very low noise level w/o turning it off completely, and then allow a 90mm "silent" to blow air into the unit, perhaps just using the tiny fan power wire to control gate of igbt or fet to switch on 90mm fan, which gets power from the usb-c psu provided, I will use a C splitter, etc.

As for the 1kHz noise I mention, I meant just in display trace, why do the tops look jittery, why not just a very flat line on the order of the rise and fall lines?

 

That's a good question, I would guess that's quantization and other artifacts. My MSO5000 just draws a fat trace (due to the 10 bit sampling)... the DHO has a much skinnier trace and doesn't bother me. I'm sure it's some very tiny value that's fluctuating.

 

Firmware version: 00.01.01
the internal 1kHz is very clean.

I believe there were issues with power supply noise in the first units. This one came with the LITEON external power supply. I especially like the FFT. The fan noise isn't too bad but on the higher pitched whiney side.

View attachment 309786

Can you post pic of your FFT settings.

 

There are a few areas to check - to make it work with what you're looking at
X
Freq
Scale
Color grade
Peak Search

Hint: Increase the memory depth and time base

 

There are a few areas to check - to make it work with what you're looking at
X
Freq
Scale
Color grade
Peak Search

Hint: Increase the memory depth and time base

The FFT flat-top function does not work right, at least not right out of the box. Apparently this is an issue for the 804 users. the v01.02 formware notes do not mention anything fixed in FFT functions.

When I run hamming on the unit's 1kHz I get a large peak around 200Hz.

 

Share a screenshot. If you change the time base, there is a setting that appear to accentuate even harmonics. It’s buggy for sure but still useful.

 

To fix the FFT issue you need to edit a file and make changes to some coefficients for the flattop window math. There's nothing in the gui that can fix it.

You can also make an edit to vendor.bin file to turn the 804 into a 914, less the digi stuff.

With the 01.02 firmware the dc offset issue seems to have been resolved. I run the 804 as a 914 with the 250MHz bandwidth option.

 

It decodes the FM80 oddball 9 bit serial correctly (the SDS 1202X-E doesn't have a 9 bit decode option) but has no CANBUS decode, yet (I hope).
View attachment 303653
View attachment 303652

Upgraded the firmware (1.3.26 -> 1.3.27) on the SDS 1202X-E and now it won't decode continuous, plain vanilla, 8-n-1 serial frames without 2 stop bits on a slow 4800bps data stream. A little search
found this nugget from their Technical Support & Service.

WTF !!! It's not a bug, it's a feature, meme reply. Time for a firmware downgrade to get it working again.