to add parallel resistors instead of replacing resistors to get the 200MHz resistor values. Problem is where can you purchase these resistor values in 0.1% and 1%?
bad idea, this will increase the caapacitance.
Do you know what physical size the SMD resistors are.
mouser is haveing alle of them,
22.1R 0.1% or 22R 1% in 0603
280R 0.1% in 0603
10R 0.1% in 0603
82R 1% or 82.5R 0.1% in 0603
33R x 4 1% array in 1206
what equipment do you need to calibrate the oscilloscope when the above resistors have been changed. What is the procedure. Would the normal oscilloscope push button calibration do the job? I don't know much about what the calibration is other than you only have the power cable connected to calibrate.
the one you don't have (400MHz analog or DSO to compare results, 1kHz to 250MHz square/sinus generator, good set of RG316 cables, active and passive probes) but at least a 1kHz and 10kHz signal generator with stable amplitude, true rms dmm to measure the amplitude
and some luck.
The compensation can be changed by the cap value (red marked), the measured amplitude must match the real signal amplitude (square and sinus),
you will of course have to wait at leat 30mins before the DSO would be warm enough and after each step (1 and 10kHz signal) do self-calibration
and compare results again.
Still, i do not recommend to play with compensation without knowledge about and good equipment. For sure you might have luck
and no compensation will be necessary, but i would not bet on that.