Well, bandwidth measurements kind of the hardest, as it needs good understanding how the measurement setup affects the shown results, but don't panic, there are several great articles about the art.
This is one of the best, for you, mostly the beginning of the artilce and the appendices are the most interesting as it deals with oscilloscope behaviour and proper probing techniques.
As for oscilloscopes: one of the most popular (analog) high bandwidth oscilloscope family is the Tektronix 2465 no suffix/A/B with bandwidth respectively 300/350/400MHz, these are very generously specified as all of these easily outperforming the advertised bandwidth specs, has digital readout feature and two full featured channel, and two additional channel with limited input (voltage) range. These are great scopes, and not extremely expensive, but as a high performance units their age (~30yo) is slowly starting to show its signs. Capacitors needs to be replaced allover the place, and more specifically (depending on revision) these scopes also contain a DALLAS chip to retain calibration constants, once the battery depletes the constants are lost. So backing up the DALLAS chip content is essential. While recalibration is also possible, it requires a very specific toolset to perform, and it is not very easy nor cheap to come by, but there is a huge fan base of this family of scopes so the community power can help a lot, but it is definitely a hassle.
Tektronix 2445 was a lower spec (150MHz) sibling of this family but it is also a very great instrument, often performing well over 200MHz:
SeeA vintage classic is the Tektronix 485 (350MHz), while old (~40 yo.), but it is built like a tank.
With digital: they had their TDS5xx/6xx series, they are similar vintage to the 2465, so they equally suffer from bad caps, and calibration is only externally possible
Hewlett-Packard is an other great oscilloscope manufacturer, their fully analog scopes topped at 275MHz bandwidth, 172x model series, myself have a HP 1720A model. With digital scopes they have a wide selection: HP 54542 or HP54641/2 are good example, the nice thing about the HP digital scopes is that they can self calibrate, that is you just have to connect a single coax cable from the back to the front and run the self cal routine, very convenient.
There were other manufacturers for high bandwidth analog scopes like Philips and Iwatsu, but these are rare (along with spare parts and knowledge about them).
In contrast you can buy a brand new Rigol DS1054z oscilloscope for under 500 EUR, that is a 4 ch 50MHz digital oscilloscope (which can be easily software hacked to 100MHz bandwidth), this would not be suitable for bandwidth measurements, but for everything else yes.
A brand new Peaktech 1275 (2 ch, 300MHz) scope is about 1500 EUR, a Rohde&Schwartz RTC 1k 302 (2 ch, 300MHz) digital oscilloscope is about ~2100EUR
Well it seems I have come to the right place or at least person for oscilloscope info. This info is more than I expected. Thanks.
