To get the bandwidth, the probe should use as little metal as possible and make maximum use of air as the dielectric to minimize its capacitance. These were the guiding design principles behind the B1695 coaxial probe from Rika Denshi America, Attleboro, Mass. (www.testprobe.com). It uses a patented center section to anchor all the other parts, strengthening it without adding much metal and leaving plenty of open space for air.
Double-ended coaxial probe with bandwidth to burn
Technicians testing interfaces want probes with little resistance, ample plunger travel, independent ground shielding and, most of all, high bandwidth.