Author Topic: Waveform characterization using an oscilloscope vs a DC source  (Read 1582 times)

0 Members and 1 Guest are viewing this topic.

Offline SharpEars

  • Supporter
  • ****
  • Posts: 627
  • Country: us
Waveform characterization using an oscilloscope vs a DC source
« on: October 13, 2015, 05:29:24 pm »
Some of the more expensive DC sources (e.g., Keysight 66312A, 66319B/D, 66321B/D) can perform waveform characterizations with 2048-4096 data points and voltage/current measurements and less than a 50 uS sample rate. I am wondering if there are any advantages to using them vs a cheaper DC source and a decent oscilloscope?

In other words, these sources seem to combine oscilloscope functionality with a power supply, if I understand how they work properly. However, is there some killer feature that they offer that cannot be accomplished using a cheaper source and a scope?
 

Online Marco

  • Super Contributor
  • ***
  • Posts: 4625
  • Country: nl
Re: Waveform characterization using an oscilloscope vs a DC source
« Reply #1 on: October 13, 2015, 05:54:16 pm »
They can put a current measurement shunt above a MOSFET pass element so it has no burden voltage, can't do that with your scope.
 

Offline SharpEars

  • Supporter
  • ****
  • Posts: 627
  • Country: us
Re: Waveform characterization using an oscilloscope vs a DC source
« Reply #2 on: October 13, 2015, 06:08:39 pm »
They can put a current measurement shunt above a MOSFET pass element so it has no burden voltage, can't do that with your scope.

So if I wire a low resistance current shunt in series with the device under test, which will be bypassed for purposes of voltage measurement/regulation due to the sense wires that will be connected to the device under test, I will not get the same effect?

 

Online Marco

  • Super Contributor
  • ***
  • Posts: 4625
  • Country: nl
Re: Waveform characterization using an oscilloscope vs a DC source
« Reply #3 on: October 13, 2015, 06:17:32 pm »
Yeah, if your power supply has a sense wire my argument is wrong in retrospect.
 

Offline SharpEars

  • Supporter
  • ****
  • Posts: 627
  • Country: us
Re: Waveform characterization using an oscilloscope vs a DC source
« Reply #4 on: October 13, 2015, 07:45:28 pm »
Yeah, if your power supply has a sense wire my argument is wrong in retrospect.

So it seems like these expensive mobile test sources have no advantages at all, except for perhaps very fast transient response to changing loads?

 

Online Someone

  • Super Contributor
  • ***
  • Posts: 2295
  • Country: au
Re: Waveform characterization using an oscilloscope vs a DC source
« Reply #5 on: October 13, 2015, 10:29:20 pm »
Some of the more expensive DC sources (e.g., Keysight 66312A, 66319B/D, 66321B/D) can perform waveform characterizations with 2048-4096 data points and voltage/current measurements and less than a 50 uS sample rate. I am wondering if there are any advantages to using them vs a cheaper DC source and a decent oscilloscope?

In other words, these sources seem to combine oscilloscope functionality with a power supply, if I understand how they work properly. However, is there some killer feature that they offer that cannot be accomplished using a cheaper source and a scope?
You could end up paying more for a current probe than the power supply to make the same measurement, the other value in these power supplies are their fast transient responses.
 


Share me

Digg  Facebook  SlashDot  Delicious  Technorati  Twitter  Google  Yahoo
Smf