#### yeepox_m

##### Newbie level 4

can anyone help me please.

im trying to measure inductor & capcitor values at rf up to around 150 mhz (up to srf). im using a 50ohm output rf sig gen capable of covering these frequencies.im also using a cro with sufficient bandwidth.

can anyone devise a test circuit for inductors and caps separately. ive been trying to use either a resonant peek parallel LC or series LC resonant dip circuit. although this works, you can only determine L with known C or vice versa.

The results are awful at high frequency.

e.g.

resonant dip for C=22pf & L=1uH should be 33.9mhz, when measured its 32.7mhz. its quite good.

resonant dip for C=4.7pf & L=1uH should be 73.4mhz, when measured its 58.6mhz. its not good.

any help devising a test cct please, thanks

rick