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SPD3303X-E another question regarding binding posts.
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daisizhou:
I found it wasn't a calibration issue.
Please see the picture below. When it is not turned on, I set the output to 24V, and the display is also 24.00V. Turn on the ON switch, the screen displays 24.02V, sometimes 24.01V, or repeatedly jumps between 24.00-24.02
I don't know what caused it, could it be that the internal relay is damaged?
tautech:

--- Quote from: daisizhou on August 10, 2022, 10:05:01 pm ---I found it wasn't a calibration issue.
Please see the picture below. When it is not turned on, I set the output to 24V, and the display is also 24.00V. Turn on the ON switch, the screen displays 24.02V, sometimes 24.01V, or repeatedly jumps between 24.00-24.02
I don't know what caused it, could it be that the internal relay is damaged?

--- End quote ---
Can't find a Service manual for these older models however like the X-E PSU's these only offer a 10mA/mV resolution too. My guess it's working just fine.
We do get asked for these older models occasionally but don't stock them and instead favor the SPD3303X-E as they can be hacked if needed to the 1mA/mV resolution X model.
tautech:

--- Quote from: Electroplated on August 10, 2022, 09:43:01 pm ---Theres also the SDS1202X-E, its a 2 channel, seems like a nice scope, I need to think about a 2 or 4 channel as I have got by fine with just 2, well except for way back when TTL was common, back then I designed a 4 / 8 channel analyser that converted a dual trace crt into pretty handy tool but it had its limitations, there was a 16 channel version but it was clunky and bandwidth was pretty limited to a few Mhz tops IIRC.

Though going with the one you suggested, the 4 channel would give me more options and I would to have pink and green traces instead of the yellow and blue, just for a change !

--- End quote ---
Be aware although the 4ch X-E's followed on from the 2ch SDS1202X-E the 4ch versions while sharing the same feature set also offer a pile more functionality and and the features are somewhat better polished.
It is somewhat disappointing Siglent haven't tidied some of this mismatch of what looks like the same X-E family so one might expect a similar feature set but in reality they're miles apart.  :palm:

To get much the same feature set as the 4ch X-E's one must cough up more dosh for the SDS2000X-E that more closely matches the capabilities of the 4ch X-E's.
rf-loop:

--- Quote from: daisizhou on August 10, 2022, 10:05:01 pm ---I found it wasn't a calibration issue.
Please see the picture below. When it is not turned on, I set the output to 24V, and the display is also 24.00V. Turn on the ON switch, the screen displays 24.02V, sometimes 24.01V, or repeatedly jumps between 24.00-24.02
I don't know what caused it, could it be that the internal relay is damaged?

--- End quote ---

First image V values are Set values.
Second image V values are Read back values when it is running.

If you change setup values in run state it start first display Set values but after short time it start again display Read back values. (if I remember right this old D model)

10-20mV is imho just like normal in these models. Its resolution is 10mV  not accuracy!  10mV @ 10V is 0.1%

Calibration. There is not physically tunable adjustments at all inside. (except if you change components)
Calibration is fully software based. You need suitable instruments and calibration software /script from Siglent. (I don't recommend even trying.)
In service manual there is table you can also check if it meet designed accuracy limits.

Note also that read back measurement point is inside unit. In high current situations there still can be voltage drop between this mesurement point and output terminal point. And aven more after wires to load.
These models do not have sense lines for compensate this voltage drop.

Electroplated:
Well I am in now in serious trouble trying to repair my old Siglent scope.

I broke all resistance and bust my wallet on a SDS1104X-E, that's as far as I could go for now.

Also, if my wife can spend 350 quid fixing a dent in the car that she didn't want me to see then, I can spend on a scope that I certainly do want to see  ;D

If there are no updates on that returned power supply then you can assume that an additional feature has been added to our garden, a small hill, with me under it and a scope as a head stone.

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