New Siglent SPD4000X series power supply

[mawyatt]

Hi @mawyatt, Unfortunately V4.1.2.8R1 did not solve the issue on my SPD4323X.  Does anyone else have the SPD4323X, and do they have the same issue with power glitch when mains power is turned off, at channels 2 & 3?

Thanks

Maybe Rob/Scott can do this Power Off test. If this doesn't show up on his new PS with latest firmware, then either you have older/different hardware (PCB) or a defective PS. Either way consider returning this for a replacement, or refund if this is common SPD4323X misbehavior which is totally unacceptable IMO.

There was a new thread that this type of PS Output Voltage Glitch misbehavior causing damage to board testing and the OP was looking for PS replacements.

https://www.eevblog.com/forum/testgear/quad-output-bench-power-supply/ 

If one thinks about this type PS misbehavior it's somewhat unique! In general use one can't destroy a circuit with a DSO, AWG or DMM without doing something really stupid (like using a DMM in current mode while sensing the PCB VCC voltage, or turning an AWG On to 20V while connecting to the raw test circuit which isn't powered and has no built-in protection (like signal probing/tracing in R&D development). These, and many more, are user screwups, not instrument induced screwups. We've all been there, done that, it's our own fault, not the test equipment

With the PS Turn ON/OFF Output Glitch, this is totally different. First off the PS supplies the circuit under test and often in development/test directly bypassing the regulators. All the DUT active circuitry is powered from the PS and susceptible, in many cases uniquely so without any protection, as this powered input may be on the "other side" of any over voltage protection (as in troubleshooting). Here's where an unexpected Power ON/OFF Output Glitch can create havoc with one's attempts at troubleshooting, testing or just general use. Note, this is not due to a user screwup but entirely due to the PS misbehavior and should not be considered acceptable behavior under any condition IMO    

Best

[TheDefpom]

Rob dropped off my new SPD4306X yesterday 

I starting trying it out today and recording the review video for it.

I did not see any issues with unwanted output on any channel during use of the hard power switch... on or off, sort of.

I can confirm the spike it gets when doing the hard power switch is from radiated noise at power on inrush, possibly from switch arcing I don't know for sure, I got the exact same noise both with and without having the scope connected to the power supply terminals, I show that in the footage I recorded for the review.

I found a couple of GUI bugs which I have also fed back to Rob, for him to feedback to Siglent, relatively minor quirks, but things I think should be improved, again I will show those in the review video.

Fan noise gets moderately high when loading it with 12A for a few minutes, using parallel mode, you will see all this in the review video too.

I haven't tried the web interface or remote control yet, I need to get the unit setup in place on my bench first, to replace my Korad KA3305D (which is very slightly larger).

I will likely write a device definition for using this supply with Test Controller, I'm not sure when that will be though as my free time is extremely limited.

Was also nice to see that the unit has user calibration, just like Siglent did for the SDM3065X due to my feedback and videos, great to see that they realise the importance of that feature now so they included it without being asked this time, looks to be very easy to do too.

[Hexley]

Rob dropped off my new SPD4306X yesterday 

I starting trying it out today and recording the review video for it.

Scott, here is a request for your review video: let us see the reaction of the current readout when a pulsed load is applied at a few Hertz. Does the readout follow the instantaneous current, or does it show an average?

The reason for asking is that it would be an interesting point of comparison with the competition. One of the early reviews of the popular Instek GPP-4323, for example, noted "The meter readout is sampled, but there is no filtering. Depending on the current draw waveform you might get a very wrong value (i.e. it can pick the ON or OFF in a PWM load and display that instead of the expected average)." https://www.electrobob.com/gpp-4323-power-supply-review/

Whether one wants averaged or non-averaged readout depends on the use case, of course.

It would be interesting to know which approach Siglent chose.

Thanks.

[TheDefpom]

Rob dropped off my new SPD4306X yesterday 

I starting trying it out today and recording the review video for it.

Scott, here is a request for your review video: let us see the reaction of the current readout when a pulsed load is applied at a few Hertz. Does the readout follow the instantaneous current, or does it show an average?

The reason for asking is that it would be an interesting point of comparison with the competition. One of the early reviews of the popular Instek GPP-4323, for example, noted "The meter readout is sampled, but there is no filtering. Depending on the current draw waveform you might get a very wrong value (i.e. it can pick the ON or OFF in a PWM load and display that instead of the expected average)." https://www.electrobob.com/gpp-4323-power-supply-review/

Whether one wants averaged or non-averaged readout depends on the use case, of course.

It would be interesting to know which approach Siglent chose.

Thanks.

I just tested that function (I won't do it in the video, it is already gong to be very long), it does not filter, it only shows the current at the moment it samples, I had it switching between 0A and 2A at various speeds at a 50% duty cycle at 100mS up to 500mS and the display either said 0A or 2A depending upon the current at the moment it sampled.

[sparky2024]

Scott,

Can you please try to replicate the mains switch-off problem that I am seeing?

Switch unit on, power-up either channel 2 or 3, say 12v.  Soft power off, observe 0v.  Then switch off the unit via the mains switch.  Do you observe any power glitch from that channel at that time?

I’m thinking this may be specific to the SPD4323X or just my unit, since everyone who has responded has one of the other models.

Thanks to all for your time, including Tautech who has also very kindly responded on PM.

Best regards
Sean

[TheDefpom]

Scott,

Can you please try to replicate the mains switch-off problem that I am seeing?

Switch unit on, power-up either channel 2 or 3, say 12v.  Soft power off, observe 0v.  Then switch off the unit via the mains switch.  Do you observe any power glitch from that channel at that time?

I’m thinking this may be specific to the SPD4323X or just my unit, since everyone who has responded has one of the other models.

Thanks to all for your time, including Tautech who has also very kindly responded on PM.

Best regards
Sean

As I mention above, no issues with that, I also show it in the footage I shot.

[TheDefpom]

I found an interesting thing.. all of the actual voltage, current and power responses over SCPI are up to 6 decimal places...

See this yourself, send it these and see what you get back!
MEAS:VOLT? CH1
MEAS:CURR? CH1
MEAS:POWER? CH1

I am working on the Test Controller definition right now, I have it working already but I'm just tweaking things to tidy it up before I publish it :-)

[Furna]

I found an interesting thing.. all of the actual voltage, current and power responses over SCPI are up to 6 decimal places...

See this yourself, send it these and see what you get back!
MEAS:VOLT? CH1
MEAS:CURR? CH1
MEAS:POWER? CH1

I am working on the Test Controller definition right now, I have it working already but I'm just tweaking things to tidy it up before I publish it :-)

Thanks Defpom, I didn't think to start playing with SCPI.

Confirmed on SPD4121x too; it is in the User Manual/Programming guide as well at pag. 72

_{Escape character is '^]'.
MEAS:VOLT? CH1
3.003907
MEAS:CURR? CH1
0.019987
MEAS:POWER? CH1
0.060029
telnet> close
Connection closed.}

That is really interesting.

Meanwhile I noticed that upgrading the firmware the LAN config was reset; not a big issue for me since I use DHCP but I had to go back in the LAn config and re-enable DHCP.

Thank you a lot for your effort on the Test Controller definition and can't wait for the video!

[TheDefpom]

Before I can publish the Test Controller definition I need a bit of info about the other units.

Can people please confirm the absolute maximum settings for voltage and current on each unit, the data sheet gives general setting only but they can go over that slightly, the quickest way is to select the first digit and spin the encoder clockwise, it will max itself out.

For instance my SPD4306X does the following
Ch1: 15.15V/1.515A
Ch2: 30.3V/6.06A
Ch3: 30.3V/6.06A
Ch4: 15.15V/1.01A

(these are seperate as the data sheet shows these may NOT actually be doubled on some units)
Ch2 Series: 60.6V/6.06A
Ch2 Parallel: 30.3V/12.12A

Please list in the same way, once I have this information I can publish then test controller definition.

[tautech]

See P4
https://int.siglent.com/u_file/download/24_08_14/SPD4000X_DataSheet_EN01B.pdf

[TheDefpom]

See P4
https://int.siglent.com/u_file/download/24_08_14/SPD4000X_DataSheet_EN01B.pdf

I already looked at that and it is not actually correct, which is why I need to hear from others what the 4121 and 4323 maximums are, they do very slightly more than it says, and I want to allow the definitions to use it all.

[KungFuJosh]

Scott's correct; even the SPD3303X datasheet specs are slightly conservative compared to what the device will do/show.

[tautech]

See P4
https://int.siglent.com/u_file/download/24_08_14/SPD4000X_DataSheet_EN01B.pdf

I already looked at that and it is not actually correct, which is why I need to hear from others what the 4121 and 4323 maximums are, they do very slightly more than it says, and I want to allow the definitions to use it all.

Which could be a wasted exercise if there are minor variations between units.
What size sample might you consider sufficient to make assumptions on the max output level across all of the 4 outputs and 3 models.

IMO you would be better to use the rated max datasheet output so to be sure all models can meet the programmed output.

Specifications
Unless otherwise noted, all specifications are guaranteed within the temperature range of 25°C±5°C with warm-up time of 30 minutes.

Q
Have you confirmed output higher than rated can be provided using the command set P51 ?
https://int.siglent.com/u_file/download/24_08_14/SPD4000X_UserManual_EN01B.pdf

[TheDefpom]

What I listed is the settings that the unit allow you to go up to, so from my list, Ch1 could be set to do 15.15V and 1.515A, as set on screen, etc.

I'm not talking about a measured output voltage on the terminals, but the maximum setting that can be made on screen and via SCPI.

[Furna]

[...]
Can people please confirm the absolute maximum settings for voltage and current on each unit, the data sheet gives general setting only but they can go over that slightly, the quickest way is to select the first digit and spin the encoder clockwise, it will max itself out.
[...]
Please list in the same way, once I have this information I can publish then test controller definition.

SPD4121X: values set using the encoder

Ch1: 15.15V/1.515A
Ch2: 12.12V/10.1A
Ch3: 12.12V/10.1A
Ch4: 15.15V/1.515A

Ch2 Series: 24.24V/10.1A
Ch2 Parallel: 12.12V/20.2A

[KungFuJosh]

Looks like it's a 1% value increase over any stated number. 15 is 15.15, 10 is 10.1, 12 is 12.12, etc.

[Furna]

[...]
I'm not talking about a measured output voltage on the terminals, but the maximum setting that can be made on screen and via SCPI.

... and I have the same values if I set via SCPI i.e.

:SOURce:VOLTage:SET CH1,MAX
:SOURce:CURRent:SET CH1,MAX

Results in
Ch1: 15.15V/1.515A

[TheDefpom]

[...]
Can people please confirm the absolute maximum settings for voltage and current on each unit, the data sheet gives general setting only but they can go over that slightly, the quickest way is to select the first digit and spin the encoder clockwise, it will max itself out.
[...]
Please list in the same way, once I have this information I can publish then test controller definition.

SPD4121X: values set using the encoder

Ch1: 15.15V/1.515A
Ch2: 12.12V/10.1A
Ch3: 12.12V/10.1A
Ch4: 15.15V/1.515A

Ch2 Series: 24.24V/10.1A
Ch2 Parallel: 12.12V/20.2A

Thats great, and numbers I thought it would be too, have added to the definition.

The definition is very nearly done, I have a couple of bugs I am trying to work out where it is not populating a couple of values due to the selector for series/parallel modes, it seems they are not filled in due to being disabled when it loads, I might have to do a dummy value somewhere or something, or ask HKJ about how to get it working, i'm probably missing something obvious.

[TheDefpom]

Attached is the Test Controller definition, I will probably tweak it more later, possibly to add the list feature etc. but for now this is probably good enough, I will be posting this on the thread by HKJ as well for inclusion in future releases.

I noticed in the manual it mentions an X-E and X-C variant... I have ignored those for now as they are not mentioned in the data sheet.

[tautech]

Attached is the Test Controller definition, I will probably tweak it more later, possibly to add the list feature etc. but for now this is probably good enough, I will be posting this on the thread by HKJ as well for inclusion in future releases.

I noticed in the manual it mentions an X-E and X-C variant... I have ignored those for now as they are not mentioned in the data sheet.

Only applicable to SPD3000 models.
In the west we only have SPD3303X and X-E.

[TheDefpom]

Attached is the Test Controller definition, I will probably tweak it more later, possibly to add the list feature etc. but for now this is probably good enough, I will be posting this on the thread by HKJ as well for inclusion in future releases.

I noticed in the manual it mentions an X-E and X-C variant... I have ignored those for now as they are not mentioned in the data sheet.

Only applicable to SPD3000 models.
In the west we only have SPD3303X and X-E.

Might want to tell Siglent to fix the user manual then, page 17 list 3 variants for each model.

[TheDefpom]

cough...

Review Part 1:

[TheDefpom]

SDM4306X Review Part 2, the teardownoning.... also look at the web server function along with the Test Controller definition I wrote:

[Furna]

cough...

Review Part 1:

I have firmware version  4.1.2.8R1

40':30'' 10.000V bug for CH1 and CH4 is not present in my SPD4121X

[Furna]

SDM4306X Review Part 2, the teardownoning.... also look at the web server function along with the Test Controller definition I wrote:

I have firmware version  4.1.2.8R1 on SPD4121X

14':30'' On my PSU in the web interface Description and Hostname are correct. Lan Settings are correctly populated and Modify LAN Settings works properly.
I have shorter delays when changing Vset and Iset. Also Volt and Current values are shown with shorter delays.
Wireshark (network protocol analyzer) demostrates all communication go through TCP80.
Also, you didn't realize that "Download" in the List settings, actually uploads the list from the browser to the PSU. Confusing I know but it seems chinese people are confusing the concept quite often.
You have to re-"Downalod" the list for each chnage you do i.e. when enabling "continuos" cycling.
When Continuos cycling is running, you have to press Play again to stop it.

For your issues I would try a different browser (it might solve the "delays" and Lan settings not popualating/working) and re-flashing the firmware (it might solve the Description and Hostname issue.)

Definitely the Web Interface need improvements.

Thank you for the device definitions in TC!