The Model 325B Picoprobe sets new® standards in microwave probing performance. Benefiting from coaxial techniques, which have inherent low loss and low dispersion characteristics, the Model 325B Picoprobe achieves an insertion loss of less than 3.0 db and a return loss of greater than 15 db over its frequency range (see accompanying data).
With its individually spring loaded, Beryllium-Copper tips, the Model 325B Picoprobe provides reliable contacts, even when probing nonplanar structures. This reliable low resistance contact is one of the keys to providing highly repeatable measurements. The Model 325B Picoprobe also allows direct viewing of the probe tips for accurate positioning. Any pitch (tip spacing) from 25 to 90 microns is recommended. The probe can be configured with Ground-Signal-Ground (G,S,G), Ground-Signal (G,S), or Signal-Ground (S,G) tip footprints. We recommend a G,S,G footprint for best performance.
Typical uncalibrated performance of a Model 325B-GSG-80-BT while touching a 50 ohm load on our CS-15 calibration substrate
Typical insertion loss of a Model 325B-GSG-80-BT
The Model 325B Picoprobe bias T provides a direct low resistance DC path for supplying up to 250 mA to a device under test. The bias T also has special circuits which add loss at frequencies below the waveguide cut off frequency.
The probes also have a 3 hole mounting adaptor which will fit standard microwave probe stations.