开云体育

Hi all,

I have a Tek 2235. Its -3dB bandwidth specification is "DC to at least
100MHz" when using the 5mV/division to 5V/division vertical scales.

For no particular reason, I decided to verify that specification. I
connected an HP8657B signal source to the CH1 input with a 36in RG59
coaxial test lead and used a BNC-tee to terminate the scope input with
50 ohms. Then I made some measurements using 0dBm at 1MHz as the
reference. Using this method, the -3dB point is about 20MHz on both CH1
and CH2. It's down about 24dB at 100MHz.

I was expecting the -3dB point to be at least 100MHz. Is my methodology
flawed? Do I have a bad scope?

Thanks.

Steve