AC coupling cut off frequency in Oscilloscope

[engr_joni_ee]

Hi,

I am wondering what is the cut off frequency of AC coupling in this Oscilloscope PicoScope 5444D and 5444D MSO 4-channel, 200 MHz.

 

[KlausST]

Hi,

just switch it to "AC", input a Dc voltage and watch the step response.
Measure tau (= until 63% of DC voltage)

fc = 1/(2 * pi * tau)

Klaus

 

[crutschow]

just switch it to "AC", input a Dc voltage and watch the step response.
Measure tau (= until 63% of DC voltage)

For determining the low-frequency cutoff you would measure when the step input drops to 37% of the peak value to get tau (time-constant).

 

[KlausST]

Hi,

63% rising, 37% falling .. where is the difference?

Oh yes, it´s a high pass. For sure. You are right.

Klaus

 

[FvM]

My Agilent/Keysight 6000 has 3.5 Hz high pass corner. Unfortunately Picoscope manual and datasheet don't specify.