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Lab Power Supply Turn ON and OFF Characteristics

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David Hess:
Here are the waveforms for a Tektronix PS503A power supply set for 8 volts and 80 milliamps.  This power supply has 50 microfarads of output capacitance.  The output control switch operates by controlling the reference.  Neither the voltage or current control loops are clamped.

The current waveform had some variation so I recorded multiple examples with my DSO set to accumulate them.  The peak excursion with current limiting was 1 volt higher than the nominal 4 volt output into 50 ohms.  I have no idea why this variation exists.

radar_macgyver:
Startup for the Agilent U8001A again, this time with 8V and 40mA settings. The only 'odd' thing I see is the fast rise to ~250 mV before the much slower rise to the final 2V. The behavior is similar on other current limit settings and in constant voltage mode.

Aldo22:
Fnirsi DPS-150

Nice behavior when switching on and off with the button, but full 8V at the beginning if you just plug in the cable.

BennoG:

--- Quote from: Aldo22 on October 17, 2024, 01:11:34 pm ---Fnirsi DPS-150
Nice behavior when switching on and off with the button, but full 8V at the beginning if you just plug in the cable.

--- End quote ---

The hard cable connection is expected because the PSU has some capacitors that needs to be discharged before current limiting can start.

Benno

Aldo22:

--- Quote from: BennoG on October 17, 2024, 02:08:15 pm ---The hard cable connection is expected because the PSU has some capacitors that needs to be discharged before current limiting can start.

--- End quote ---

Thank you.
I don't know how other "better" PSUs behave.
Anyway, you should keep in mind that you are probably not absolutely safe from overcurrent if the connection is interrupted for a short time.

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