20 GHz Dual TDR/Sampling Head  
 ektronix SD-24 sampling head enable the high performance features of the CSA803C ａnd 11801C Sampling Oscilloscopes
SD24
TDR/Sampling Head
Dual-channel, Differential TDR
20 GHz Bandwidth
35 ps Reflected Rise Time
 
the SD24 is a dual-channel TDR/Sampling Head. This sampling head has a rise time of 17.5 ps or less, with a typical 20 GHz equivalent bandwidth.

Each channel of the SD24 is also capable of generating a fast rising step for use in Time Domain Reflectometry （TDR）. In TDR mode, the acquisition portion of the sampling head monitors the incident step ａnd any reflected energy. The reflected rise time of the TDR step is 35 ps or less. The polarity of each channel$$$s TDR step can be selected independently of the other channel. This allows for differential or common-mode testing of two coupled lines, in addition to the independent testing of isolated lines. The SD24 can be used to characterize crosstalk by using the TDR step to drive one line while monitoring a second with the other channel