Frequency Response Plots for DS2000 series 300Mhz firmware.
The measurements were made using a 50 ohm signal source to a "T" piece with a 50 ohm termination on the DSO.
This means that the high frequency response (~150Mhz +) will actually be slightly better than shown in the plot, due to the loading effect of the DSO channel input capacitance.
Unfortunately I do not have access to a measuring head at present, to allow me to compensate for this loading effect.
While doing these measurements I found that with Ch1 and Ch2 turned on, the displayed waveform does not change when switching between 1nS and 2nS/div. It is displayed as 2nS/div. The time/div readout changes but the only change to the displayed wave form is the trigger point.
If there is a frequency measurement active on the screen, it will read double the correct value when on the 1nS/div range.
The hardware freq counter reading remains correct .
With only one Channel turned on, all is well.
Also had a quick look at the 500Mhz firmware ver.
The frequency response is still like a DS2202. (3dB down at ~240Mhz).
The 500pS and 1nS/div behave in the same way as described above for the 300Mhz ver except it now happens with only one channel on.
Thanks for sharing the fruits of your long, busy, sleepless nights cybernet.