inexpensive and highly accurate, the vendor says. The devices, type designation T3SP10D (10 GHz) and T3SP15D (15 GHz), offer customers a combination of portability, reliability, and functionality at a cost-effective price point. Before the availability of Teledyne LeCroy’s 10- and 15-GHz TDRs, portable tools were either much costlier high-end TDRs, or single-ended instruments with limited functionality. The single-ended approach, which characterizes a device under test (DUT) with mathematical calculation of frequency and time-domain characteristics, is not accurate enough to meet today’s need to understand and control impedances from end to end in the channel. Furthermore, modern serial-data standards such as Ethernet and USB require measurement of impedance matching in the frequency domain using S parameters (S11), which would require the use of an unwieldy vector network analyzer.
The TDRs stimulate the DUT with true differential and common-mode signals. This unique combination enables designers of high-speed data channels, test engineers, and field technicians to locate impedance discontinuities that can adversely affect a data signal’s rise times, pulse width, timing, jitter and noise content, resulting in degradation of overall system reliability and functionality.
Using the same open short load (OSL) calibration standards as vector network analyzers, the new TDRs reach high levels of impedance plot accuracy. With a small form factor and optional internal batteries, the instruments can go anywhere in test labs or in the field to measure impedance discontinuities in applications such as ECUs, Automotive Ethernet, and cable testing, and in industries including automotive, aerospace/defense, IC manufacturing, and telecom.