Products > Test Equipment
Test equipment is a disease...
tautech:
--- Quote from: themadhippy on July 17, 2024, 02:15:25 pm ---
--- Quote from: tautech on July 17, 2024, 12:31:15 am ---Test equipment is a disease...
--- End quote ---
And your nowt but a super spreader
--- End quote ---
Much prefer enabler. :)
tautech:
--- Quote from: exe on July 17, 2024, 02:57:51 pm ---Could somebody explain the dangers of connecting power supplies in series? Apart from lethal output voltage.
Afaik, some measurement equipment mentions that isolated outputs can only float above ground up to some voltage (e.g., 240V). Can this be a problem with this setup?
--- End quote ---
Internal breakdown/flashover clearances and component ratings determine how many units can be placed in series.
Ratings such as follows give indications of how high you can push series connections:
Insulation
Case to Terminal ≥ 20 MΩ (DC 500 V)
Case to AC line ≥ 30 MΩ (DC 500 V)
Martin72:
Hi,
--- Quote ---Internal breakdown/flashover clearances and component ratings determine how many units can be placed in series.
--- End quote ---
That was not the idea behind it, the aim is to reliably separate input and output potentials.
--- Quote ---Ratings such as follows give indications of how high you can push series connections:
Insulation
Case to Terminal ≥ 20 MΩ (DC 500 V)
Case to AC line ≥ 30 MΩ (DC 500 V)
--- End quote ---
These are insulation values against the housing(GND), which has nothing to do with how far you can push the series connection.
The 500V is the test voltage.
On the one hand, it is about the sufficient insulation of active circuits against the housing (contact), and on the other hand about the leakage current that results from the EMC capacitors at the input/output against the housing.
CatalinaWOW:
In theory connecting isolated outputs from multiple supplies in series doesn't cause any issues. But in the real world there is often a sneak circuit connecting something you are powering with that series question to ground, and then the mischief happens. Some people are more careful than others. Those of us who slip up once in a while like to put an extra layer of protection to cover our occasional lapses. And thus tend to avoid this type of series connection.
tautech:
--- Quote from: Martin72 on July 17, 2024, 11:33:08 pm ---Hi,
--- Quote ---Internal breakdown/flashover clearances and component ratings determine how many units can be placed in series.
--- End quote ---
That was not the idea behind it, the aim is to reliably separate input and output potentials.
--- End quote ---
And how does the highlighted above not do that ? :popcorn:
--- Quote ---Ratings such as follows give indications of how high you can push series connections:
Insulation
Case to Terminal ≥ 20 MΩ (DC 500 V)
Case to AC line ≥ 30 MΩ (DC 500 V)
--- End quote ---
--- Quote ---These are insulation values against the housing(GND), which has nothing to do with how far you can push the series connection.
The 500V is the test voltage.
On the one hand, it is about the sufficient insulation of active circuits against the housing (contact), and on the other hand about the leakage current that results from the EMC capacitors at the input/output against the housing.
--- End quote ---
So, just the same as any other device we use and you push near it at your own risk. :scared:
If we are discuss what can be done with specific models, sure let's do that.
FYI series connections of multiple SPD3303X when in Series mode is a HQ endorsed use type.
A few years back from the HQ App engineer:
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