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Electronics => Beginners => Topic started by: nidlaX on June 27, 2017, 07:12:17 am

Title: Differential Probe Output Cable Impedance - Does it matter?
Post by: nidlaX on June 27, 2017, 07:12:17 am

Out of curiosity, does it matter what type of BNC cable is used for the output cable of a (<200 MHz) differential probe? Most manufacturers don't even specify whether they use 50 Ohm or 75 Ohm cable, but I'm guessing 50 Ohm is the standard.

Title: Re: Differential Probe Output Cable Impedance - Does it matter?
Post by: tautech on June 27, 2017, 08:01:41 am

Probably won't matter for LF stuff but they will be 50 \$\Omega\$ that matches channel input impedance when 50 \$\Omega\$ input is selected.

Title: Re: Differential Probe Output Cable Impedance - Does it matter?
Post by: capt bullshot on June 27, 2017, 08:09:56 am

I wouldn't consider 200MHz LF stuff ...
And I'd expect the cable to have 50 Ohms.

Title: Re: Differential Probe Output Cable Impedance - Does it matter?
Post by: tautech on June 27, 2017, 08:15:13 am

Quote from: capt bullshot on June 27, 2017, 08:09:56 am

I wouldn't consider 200MHz LF stuff ...

Neither do I. Maybe I should've stated a few 10's of KHz.

Quote

And I'd expect the cable to have 50 Ohms.

:-+