For a number of years, I used Tek 2000 series scopes for making RF measurements in transmitters and receivers. I used scopes that had bandwidths of 60 to 100 Mhz, along with good Tek probes. The signal levels ranged from a few mv to 100 watts. I could measure the frequency response of the scope by attaching the probe to the output of my HP 8648 signal generator. The response was always predictable - very flat up to the -3 db falloff point of the scope.
I now have a LeCroy WaveAce 224 scope that is supposed to have bandwidth of 200 Mhz. If I attach the 300 Mhz LeCroy probe to my HP signal generator, the frequency response curve is all over the board - mostly flat up to about 30 Mhz, then lots of peaks and valleys up to 200 Mhz. Signals at 300 Mhz are readable, but are about 10 db down in level.
So I am wondering if my frequency response problem with my LeCroy is typical for DSO scopes or if my LeCroy is not working right. I would like to get a lower cost Siglent scope to test - that should tell me if I am seeing something normal or abnormal.
My gut feeling tells me that I should have stayed with the Tek scopes for doing RF work.
Regards
Clint
W7KEC