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February 2005 [Test & Measurement] Refinements Revitalize Variable Delay Lines Delay lines in the PDL Series from Colby Instruments (Bellevue, WA) brought precision delays to analog and digital testing from DC to 18 GHz almost two decades ago. Although capable of accurately adjusting delay lengths as long as 625 ps, this first generation of instruments was at times difficult to program and operate. Fortunately, the 2005 version of the PDL series is easier to use, with increased precision and range, a Windows-based user interface, TCP/IP Ethernet capability, and an... February 2005 [Test & Measurement] Perfecting The Programmable Delay Mechanical variable delays may appear simple, but their basic design has traditionally had inherent limitations that rendered them useful only for infrequent changes in delay made either manually with a screwdriver, micrometer, or by a slow-speed motor. Several mechanical delay-line configurations have been patented, and while each varies delay differently, the principle is the same: The electrical length of a conductor or cable is varied mechanically by moving the conductor... |
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