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Lab Power Supply Turn ON and OFF Characteristics
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tautech:

--- Quote from: mawyatt on October 07, 2024, 09:23:37 pm ---
--- Quote from: Furna on October 07, 2024, 04:57:00 pm ---
--- Quote from: mawyatt on October 07, 2024, 02:57:02 pm ---With the new Siglent SPD4000 series we find it interesting that the results from CH1 and CH2 are different wrt to the conditions discussed here as shown by Furna. We don't see this with the older SPD3303X as both channels behave the same as expected!! Also, haven't seen any post that indicate other supplies have different behavior with 2 main channels with same specs as one would "expect" the detailed design and implementation of the channels would be identical. 

Would be interesting to find out why, as this is quite puzzling?

Best

--- End quote ---

For whom is not following the Siglent SPD4000 series thread, my measurements of Siglent SPD4121X are available at
https://www.eevblog.com/forum/testgear/new-siglent-spd4000x-series-power-supply/msg5667709/#msg5667709
https://www.eevblog.com/forum/testgear/new-siglent-spd4000x-series-power-supply/msg5667823/#msg5667823

Siglent SPD4000 series has 4 channels that are inerhently different ...
SPD4121X in particular has
CH1-CH4 15V 1.5A are independent
CH2-CH3 12V 10A can be setup in series/parallel and both also have 4wire sense

--- End quote ---

That's unusual that CH1 and CH4 are the same and CH2 and CH3 are the same but different from CH1 and CH4, this explains the difference since CH1 (15V 1.5A) is not the same specification as CH2 (12V 10A) and thus one might expect a different response from such!!

Best,

--- End quote ---
All three SDP4000X models have quite different ratings.
Ch 1&4 are equal and likewise Ch 2&3 but different for each model.
Check out P4
https://int.siglent.com/u_file/download/24_08_14/SPD4000X_DataSheet_EN01B.pdf
mawyatt:

--- Quote from: tautech on October 07, 2024, 10:03:06 pm ---
--- Quote from: mawyatt on October 07, 2024, 09:23:37 pm ---
--- Quote from: Furna on October 07, 2024, 04:57:00 pm ---
--- Quote from: mawyatt on October 07, 2024, 02:57:02 pm ---With the new Siglent SPD4000 series we find it interesting that the results from CH1 and CH2 are different wrt to the conditions discussed here as shown by Furna. We don't see this with the older SPD3303X as both channels behave the same as expected!! Also, haven't seen any post that indicate other supplies have different behavior with 2 main channels with same specs as one would "expect" the detailed design and implementation of the channels would be identical. 

Would be interesting to find out why, as this is quite puzzling?

Best

--- End quote ---

For whom is not following the Siglent SPD4000 series thread, my measurements of Siglent SPD4121X are available at
https://www.eevblog.com/forum/testgear/new-siglent-spd4000x-series-power-supply/msg5667709/#msg5667709
https://www.eevblog.com/forum/testgear/new-siglent-spd4000x-series-power-supply/msg5667823/#msg5667823

Siglent SPD4000 series has 4 channels that are inerhently different ...
SPD4121X in particular has
CH1-CH4 15V 1.5A are independent
CH2-CH3 12V 10A can be setup in series/parallel and both also have 4wire sense

--- End quote ---

That's unusual that CH1 and CH4 are the same and CH2 and CH3 are the same but different from CH1 and CH4, this explains the difference since CH1 (15V 1.5A) is not the same specification as CH2 (12V 10A) and thus one might expect a different response from such!!

Best,

--- End quote ---
All three SDP4000X models have quite different ratings.
Ch 1&4 are equal and likewise Ch 2&3 but different for each model.
Check out P4
https://int.siglent.com/u_file/download/24_08_14/SPD4000X_DataSheet_EN01B.pdf

--- End quote ---

See edited notes after your post.

If a supply has equal dual pairs of channels they should always be arranged in a 1,2 and 3,4 fashion, not in 1,4 and 2,3 arrangement IMO. These should be displayed in a 1,2 on top and 3,4 on bottom so one can easily compare like channels.
 
Best,
thm_w:
Rigol DP832 was shown above, as I mentioned in the other thread, it does have some small overshoot to 15-20mA so its relevant if you are current limited sub 10mA, which is very low.

Rigol DP932 Channel 1 - no overshoot:





R&S NGMO high speed power supply - Overshoots to 8V:

tautech:

--- Quote from: mawyatt on October 07, 2024, 10:19:13 pm ---
--- Quote from: tautech on October 07, 2024, 10:03:06 pm ---
--- Quote from: mawyatt on October 07, 2024, 09:23:37 pm ---
--- Quote from: Furna on October 07, 2024, 04:57:00 pm ---
--- Quote from: mawyatt on October 07, 2024, 02:57:02 pm ---With the new Siglent SPD4000 series we find it interesting that the results from CH1 and CH2 are different wrt to the conditions discussed here as shown by Furna. We don't see this with the older SPD3303X as both channels behave the same as expected!! Also, haven't seen any post that indicate other supplies have different behavior with 2 main channels with same specs as one would "expect" the detailed design and implementation of the channels would be identical. 

Would be interesting to find out why, as this is quite puzzling?

Best

--- End quote ---

For whom is not following the Siglent SPD4000 series thread, my measurements of Siglent SPD4121X are available at
https://www.eevblog.com/forum/testgear/new-siglent-spd4000x-series-power-supply/msg5667709/#msg5667709
https://www.eevblog.com/forum/testgear/new-siglent-spd4000x-series-power-supply/msg5667823/#msg5667823

Siglent SPD4000 series has 4 channels that are inerhently different ...
SPD4121X in particular has
CH1-CH4 15V 1.5A are independent
CH2-CH3 12V 10A can be setup in series/parallel and both also have 4wire sense

--- End quote ---

That's unusual that CH1 and CH4 are the same and CH2 and CH3 are the same but different from CH1 and CH4, this explains the difference since CH1 (15V 1.5A) is not the same specification as CH2 (12V 10A) and thus one might expect a different response from such!!

Now looking at the Siglent page for the SPD4121X shown, this arrangement looks OK with terminals for CH1 logically on left then the channels proceed to right as 2 thru 4 (not like GPP 4323 where Instek placed CH4 on left, then 2 thru 4 towards right  :o

The display shows 1 to 2 top and 3 to 4 below left to right which makes sense, however because of the arrangement the similar channels are diagonal not left to right as one would expect!!

Imagine using a typical analog supply arrangement of +-15V (or +-12V), then the important display parameters (V and I) are diagonal not left to right for the active channels. So glancing at the active channels in this common use case requires determining the parameters on diagonals rather than side by side!!

This makes no sense IMO, would like to hear the logic behind this arrangement from Siglent designers!!!

https://siglentna.com/power-supplies/spd4000x-series-programmable-linear-dc-power-supply/

Best,

--- End quote ---
All three SDP4000X models have quite different ratings.
Ch 1&4 are equal and likewise Ch 2&3 but different for each model.
Check out P4
https://int.siglent.com/u_file/download/24_08_14/SPD4000X_DataSheet_EN01B.pdf

--- End quote ---

See edited notes after your post.

If a supply has equal dual pairs of channels they should always be arranged in a 1,2 and 3,4 fashion, not in 1,4 and 2,3 arrangement IMO. These should be displayed in a 1,2 on top and 3,4 on bottom so one can easily compare like channels.
 
Best,

--- End quote ---
Added.

While I don't speak for them, what they have done does make some sense to me.

You've used a split rail + argument to support your POV yet in Ch 2-3 Series mode one can pull 0V from the center connection for dual tracking supply needs without any need for external cabling and only 2&3 support Series and Parallel modes and Sense.

As Ch 1&4 don't provide Series or Parallel modes or Sense it's not logical they need be grouped together even for split rail use as they can't be Series'd for dual tracking supply use.

This does however bring additional thoughts forward, should Ch 1&4 have instead been paired and given Series and Parallel capability some major changes to the design and UI would be needed, otherwise how would one know which channels were being Paralleled or Series'd ?

@Furna
What is the display indication when Ch 2&3 are used in Series and Parallel modes ?
mawyatt:

--- Quote ---While I don't speak for them, what they have done does make some sense to me.

You've used a split rail + argument to support your POV yet in Ch 2-3 Series mode one can pull 0V from the center connection for dual tracking supply needs without any need for external cabling and only 2&3 support Series and Parallel modes and Sense.

As Ch 1&4 don't provide Series or Parallel modes or Sense it's not logical they need be grouped together even for split rail use as they can't be Series'd for dual tracking supply use.

This does however bring additional thoughts forward, should Ch 1&4 have instead been paired and given Series and Parallel capability some major changes to the design and UI would be needed, otherwise how would one know which channels were being Paralleled or Series'd ?

@Furna
What is the display indication when Ch 2&3 are used in Series and Parallel modes ?

--- End quote ---

The SPD3303X and GPP4323 both allow creating a Dual Voltage Tracking Supply utilizing the Series Mode on CH1 and CH2 without any "extra" cabling also, altho the SPD3303X doesn't read the current thru/from CH2 properly (serious flaw IMO). Example drawing a different current from CH2 while in the Series Mode doesn't show in the CH2 current display. Apparently this is just displayed as a replica of the CH1 current  :P

The GPP4323 reads this condition properly and displays the correct current drawn from both CH1 and CH2 while in Series Mode, whether thru or from both channels or some current "tapped" off from CH1 or CH2.

This dialog has allowed us to discover a potential issue with the SPD3303X that we didn't know, as we don't recall ever seeing this discussed before. Maybe others can do this test in addition to the ON/OFF characteristics?

If you or Furna have the time please check the SPD4000X in Series Mode and see if CH2 and CH3 display the correct current drawn respectively. Just place a resistor across either CH2 or CH3 and see if it registers properly on the respective channel display, then attach across the full series span of CH2 and CH3, this should show twice the current and displayed in both channels as flowing thru both.

Anyway, good discussions :-+

Best
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