Product-Note_AN105A_-2400_and-HP_-8757

A Giga-tronics Product note AN-GT105AGiga-tronicsUsing the Giga-tronics 2500B 2400C Series Microwave Signal Generators withthe HP/Agilent 8757D Scalar Network AnalyzerScalar Network AnalyzersScalar analysis of microwave devices such as filters,attenuators,switches and amplifiers is apopular cost effective measurement method for device characterization.As a result,a significantnumber of scalar network analyzers are still being used extensively throughout the world.Many ofthese scalar network analyzers dating back to the 1980's,such as the HP/Agilent 8757D ScalarNetwork Analyzer,are still in use today.1=D①9⊙888Swept Frequency SynthesizerTwo common frequency synthesizers that were designed to work with the 8757D are the HP 8340and HP 8350 Series Synthesizers.The 8757D would automatically communicate with these twosynthesizers via its private IEEE 488 bus.However,these frequency synthesizers are obsolete andare no longer supported.Because of the unique IEEE 488 communications protocol used by the 8757D,replacementmicrowave synthesizers must be designed to communicate like the HP 8340 or HP 8350synthesizers,which requires that the swept source to remain in "Local mode".This enables theuser to set sweep parameters of the scalar analyzer/frequency sweeper system locally by manuallyusing sweeper's front panel controls and not by sending remote commands from a computer.When parameters such as start frequency or power level are changed,the sweeper notifies thescalar analyzer that a change has been made.The scalar analyzer queries the sweeper forchanges and updates its display to the new instrument settings.AN-GT105A-Operation of the Giga-tronics 2400B 2400C series Microwave Signal Generators with the HP 8757 Scalar Network Analyzer2009 Giga-tronics Incor porated.All Rights Reserved.