Low capacitance probe (<2pf) vs 2pf typical ?

ahmedtarek — Thu, 23 Nov 2017 06:41:02 GMT

Hello everyone,

I need help with something,

I am designing an antenna for MFRC522 and i am following AN1445 see attachments,

in page 18 of 65, the application note recommends using a low capacitance probe (<2pf) in order to measure a parameter in the receiving circuit.

i found the following low capacitance probe to use it with my oscilloscope, but it is (2pf) typical

however, there is another low capacitance probe (0.3 pf), but the cost is relatively higher,

If i use the 2pf probe, will that still comply with An1445, if not, could any one suggest a better choice,

Thank in advance,

ATarek

Re: Low capacitance probe (<2pf) vs 2pf typical ?

weidong_sun — Tue, 28 Nov 2017 04:00:48 GMT

>>will that still comply with An1445, if not, could any one suggest a better choice

No, it will not.

Please use low capacitance probe that capacitance is less than 2pF !

Have a nice day!

TIC weidong