Products > Test Equipment
Lab Power Supply Turn ON and OFF Characteristics
Aldo22:
--- Quote from: Furna on October 06, 2024, 04:25:10 pm ---Is the multimeter connected to the circuit some how?
You do not want anything in between ... especially in series mode as a multimeter measuring A.
It is altering the circuit.
--- End quote ---
Yes, there are 400mΩ extra so I can see what I'm doing. ;)
That doesn't make much difference in this case.
mawyatt:
--- Quote from: Aldo22 on October 06, 2024, 04:18:51 pm ---Is that correct?
I asked a very similar question today about the DPS-150 so I had the test setup more or less ready.
I knew the Longwei PDS-3010G was really bad in this regard.
Here is the proof. ;)
47Ω resistor.
The DMM is there to display the 40mA (when it has settled), the LW can't display such small currents.
Osc. Acq. mode is peak, therefore somewhat bold.
--- End quote ---
Not sure how the interpret the scales on your DSO, but this doesn't look good!! Seems the supply takes ~ 6 divisions to return to the Current Limit 40mA set point. If that's 500ms/div then 3 seconds!! Even if the entire span is 500ms, then ~200ms which is quite long.
Best,
Aldo22:
--- Quote from: mawyatt on October 06, 2024, 04:35:01 pm ---Not sure how the interpret the scales on your DSO, but this doesn't look good!! Seems the supply takes ~ 6 divisions to return to the Current Limit 40mA set point. If that's 500ms/div then 3 seconds!! Even if the entire span is 500ms, then ~200ms which is quite long.
--- End quote ---
The scope does not lie.
It takes this long with 47Ω.
It is faster with a “short circuit”.
Furna:
--- Quote from: Aldo22 on October 06, 2024, 04:29:45 pm ---
--- Quote from: Furna on October 06, 2024, 04:25:10 pm ---Is the multimeter connected to the circuit some how?
You do not want anything in between ... especially in series mode as a multimeter measuring A.
It is altering the circuit.
--- End quote ---
Yes, there are 400mΩ extra so I can see what I'm doing. ;)
That doesn't make much difference in this case.
--- End quote ---
You do not know what kind of resistor the multimeter has ... you are mixing type of resistors ... resistors have inductance.
Could you please repeat the test without the DMM in series?
Aldo22:
--- Quote from: Furna on October 06, 2024, 04:49:19 pm ---Could you please repeat the test without the DMM in series?
--- End quote ---
Yes, it's a bit different.
But the overall impression of this PSU doesn't really change.
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