Products > Test Equipment
New Siglent SPD4000X series power supply
mawyatt:
--- Quote from: sparky2024 on November 17, 2024, 11:36:23 am ---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
--- End quote ---
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 :o
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 :P
Best
TheDefpom:
Rob dropped off my new SPD4306X yesterday :scared:
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:
--- Quote from: TheDefpom on November 24, 2024, 10:44:31 pm ---Rob dropped off my new SPD4306X yesterday :scared:
I starting trying it out today and recording the review video for it.
--- End quote ---
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:
--- Quote from: Hexley on November 24, 2024, 11:36:42 pm ---
--- Quote from: TheDefpom on November 24, 2024, 10:44:31 pm ---Rob dropped off my new SPD4306X yesterday :scared:
I starting trying it out today and recording the review video for it.
--- End quote ---
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.
--- End quote ---
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
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