Siglent SDG1032 as bad as rigol DG812?

[eTobey]

Found some issues that dissapointed me quite a bit. Never thought i would be that dissapointed, since the step from the Rigol DHO814 to the Siglent SDS814X HD was a good one.

Some issues on my list have not been fixed in 7 years (as they can be found in an old youtube video).

- Turning the knob faster, has the opposite effect of slowing down the change in the number, to almost non at all.
   - Turning it in the right speed takes still 13 seconds to get from 0 to 100.
   
- Low level of -560mV for 5.3ms when changing waveform from sine to square
- Changing values of 100´s down to zero and back up again changes the cursor to 1´s...
- Changing the frequency of one channel, disrupts signal of other channel.
- Polarity invert changes waveform to negative values, even when lowlevel is set to 0V.

[2N3055]

Found some issues that dissapointed me quite a bit. Never thought i would be that dissapointed, since the step from the Rigol DHO814 to the Siglent SDS814X HD was a good one.

Some issues on my list have not been fixed in 7 years (as they can be found in an old youtube video).

- Turning the knob faster, has the opposite effect of slowing down the change in the number, to almost non at all.
   - Turning it in the right speed takes still 13 seconds to get from 0 to 100.
   
- Low level of -560mV for 5.3ms when changing waveform from sine to square
- Changing values of 100´s down to zero and back up again changes the cursor to 1´s...
- Changing the frequency of one channel, disrupts signal of other channel.
- Polarity invert changes waveform to negative values, even when lowlevel is set to 0V.
- Maximum Amplitude output setting ALL settings lost after reboot.

 

[tautech]

ALL settings lost after reboot.

Boot to Default is the default setting.
Boot to Last saves all settings.


^^^ something we set before dispatch. 

[eTobey]

ALL settings lost after reboot.

Boot to Default is the default setting.
Boot to Last saves all settings.


^^^ something we set before dispatch. 

I set that too, but the firmwareupdate reset it. Should have checked...

[eTobey]

Lucky me, i havent hooked up my circuit yet:
Set up a square wave  from 0V to 3.3V. Set up FM mod ->  boom! -1.6V 

[EvgenyG]

Wow. One of the reasons I sold my no-name signal gen to buy an SDG1000X was that no-name gen would output -10.5v during OS boot. Found that "feature" the hard way

Please don't tell me that SDG1000X still has teething issues.

[tautech]

Wow. One of the reasons I sold my no-name signal gen to buy an SDG1000X was that no-name gen would output -10.5v during OS boot. Found that "feature" the hard way

Please don't tell me that SDG1000X still has teething issues.

Outputs are open at boot unless you configure them otherwise.

[ArdWar]

Who connect their sig gen to DUT first before powering it on anyway?

Sure I often do that with DMM or PSU or scope, but I definitely draw the line with SG and SA...

[tautech]

Who connect their sig gen to DUT first before powering it on anyway?

Simply, those that need to.
Not all instruments are used in a lab environment.

[EvgenyG]

Who connect their sig gen to DUT first before powering it on anyway?

I know right? The DUT was under test when power briefly went out. That was followed by special effects(magic smoke) as soon as arb gen turned back on with -10.5v.

[EvgenyG]

Outputs are open at boot unless you configure them otherwise.

Well, if they output same signal as at time of shutdown that is fine. If I shut it down with 200mVppk and then turn on and it has 2Vppk that would be unacceptable.

[tautech]

Outputs are open at boot unless you configure them otherwise.

Well, if they output same signal as at time of shutdown that is fine. If I shut it down with 200mVppk and then turn on and it has 2Vppk that would be unacceptable.

Well when you get yours you can test its behavior to your hearts content.

Output ON at boot is not a setting anyone would use much unless you need it as I did a few months back on a film set we equipped with instruments.
They all had to boot to their preset states at power ON which was done by wireless control at the Directors command.
As is normal with takes on a film set, not all go as planned as the humans involved are unfortunately unprogrammable. 

Whereas the instruments performed admirably. 

Documented in this post:
https://www.eevblog.com/forum/chat/movie-scopes-(and-other-tm-props)/msg5201928/#msg5201928

[EvgenyG]

This is a really cool video! Just change the last slide to Siglent logo and you have an ad for them ready

[tautech]

This is a really cool video! Just change the last slide to Siglent logo and you have an ad for them ready

Yeah it was a lot of fun and being behind the scenes a real privilege.
Only 5km down the road was a real bonus too as trudging into town takes the gloss off things.

However we were under NDA until the film went public before I could share it here.
Not our first film rodeo even for TE and the block of land we have here has hosted several film sets over the years.

Another done some years back:
https://www.eevblog.com/forum/testgear/true-analog-scopes/msg4583536/#msg4583536

[BillyO]

Who connect their sig gen to DUT first before powering it on anyway?

I know right? The DUT was under test when power briefly went out. That was followed by special effects(magic smoke) as soon as arb gen turned back on with -10.5v.

That's why I built these for all my benches:

[Aldo22]

The FY3224S even blows out +7-8V when switching it off. Even if the channel is not active. 
If I have something sensitive, I always put a 20dB attenuator in.
Attachment shows FY3224S saying goodbye (with attenuator).

[EvgenyG]

Could you please do the same measurement at power up? One of the things that must be tested on all signal gens during reviews: what happens at power up/shut down. A bad design could kill your DUT.
To SDG1000X owners, could someone please do same measurements on your unit?
The signal gen may change waveform/frequency on power down but not go higher than set amplitude/offset. Ideally it should just cut out.
On power up, I expect exactly 0 volts until I press CH1/2 on buttons.

[Aldo22]

Could you please do the same measurement at power up? One of the things that must be tested on all signal gens during reviews: what happens at power up/shut down. A bad design could kill your DUT.

The FY3234S is even worse at power up (Attached image).
But that was to be expected. However, you might not expect another voltage increase when switching off, which is why I only showed that at first.

The internal AWG of the Hantek DSO2000 is somewhat better.
It remains at 0 when switched off.
At power up, however, it's approx. -3.8V max.

[eTobey]

Could you please do the same measurement at power up? One of the things that must be tested on all signal gens during reviews: what happens at power up/shut down. A bad design could kill your DUT.
To SDG1000X owners, could someone please do same measurements on your unit?
The signal gen may change waveform/frequency on power down but not go higher than set amplitude/offset. Ideally it should just cut out.
On power up, I expect exactly 0 volts until I press CH1/2 on buttons.

Too much expectation for a >300 bucks device...

I might not even use this on my circuit and send it straight back...


Picture of SDG 1032X on turning off:

[KungFuJosh]

What is your setup on your scope and AWG that you're able to see that?

I tried with the SDG2122X connected to my SDS2504X+, and I couldn't get anything like that. I tried with the channel power button, and power cycling the AWG, and didn't get anything like that at all. Cycling the channel gave a clean waveform that simply ended/disappeared when disabled. No effect at all while power cycling the AWG. Even searching in History didn't give me anything like that.

I dunno if the 2000 series is that different than the 1000 series in this regard. 🤷

[eTobey]

What is your setup on your scope and AWG that you're able to see that?

I tried with the SDG2122X connected to my SDS2504X+, and I couldn't get anything like that. I tried with the channel power button, and power cycling the AWG, and didn't get anything like that at all. Cycling the channel gave a clean waveform that simply ended/disappeared when disabled. No effect at all while power cycling the AWG. Even searching in History didn't give me anything like that.

I dunno if the 2000 series is that different than the 1000 series in this regard. 🤷

I got squarewave set up with 0V to 3.3V or there abouts. I used 5s period, since it only seems to happen from high level on. t also only seems to happen on channel 1.

Follow this topic here:
https://www.eevblog.com/forum/chat/will-this-signal-destroy-my-uc-pin/

[eTobey]

I just tried to see, when the sinewave amplitude would decrese with rising frequency: It did increase to 4.17V amplitude, with a set up amplitude of 3.3V.
Am i missing something?

[Njk]

Just blew up the dust from my DG812 to check it once again. But found nothing new.

The signal gen may change waveform/frequency on power down but not go higher than set amplitude/offset. Ideally it should just cut out.
On power up, I expect exactly 0 volts until I press CH1/2 on buttons.

How else it can be since there is a mechanical relay that keeps the output physically disconnected unless user pressed the key to turn the channel on. Power disappears, the relay disconnects. Actually, there are a lot of relays as the entire voltage range is not continuous. According to the doc, it's broken into 10 scales, which are switched by the mechanical relays. No doubt a curious user can capture a nice trace for relay bounce event and show the screenshot. But I doubt it's something unexpected.

[thm_w]

I just tried to see, when the sinewave amplitude would decrese with rising frequency: It did increase to 4.17V amplitude, with a set up amplitude of 3.3V.
Am i missing something?

Are you sampling a 30MHz sine wave at 100ks/s?

[EvgenyG]

How else it can be since there is a mechanical relay that keeps the output physically disconnected unless user pressed the key to turn the channel on. Power disappears, the relay disconnects.

Unfortunately this is not the case with SDG1000X and the FY gens, see screenshots above.