Agilent Technologies Network Analyzer 8510-58 Uživatelský manuál

Agilent Specifying Calibration Standards for the Agilent 8510 Network AnalyzerProduct Note 8510-5B

10It is not possible to remove fringing capacitance,but the resultant phase shift can be modeled as afunction of frequency using C0through C3(C0+Cl f

11NoteIn some cases (when the phase response is linearwith respect to frequency) the response of an opencan be modeled as an equivalent “incremental”l

The inductance as a function of frequency can bemodeled by specifying the coefficients of a third-order polynomial (L0+ L1 f + L2 f2+ L3 f3),with u

13The convention for definition of offset delay inwaveguide requires entry of the delay assuming nodispersion. For waveguide transmission line, theAgi

14µr= relative permeability constant of the medium(equal to 1.0 in air)εr= relative permittivity constant of the medium(equal to 1.000649 in air)D = i

15Therefore, for the WR-62 waveguide standard defi-nition table, offset loss of zero ohm/sec is enteredfor all four standards.Lower/minimum frequencyL

16Upper/maximum frequencyThis specifies the maximum frequency at whichthe standard is valid. In broadband applications, aset of banded standards may b

17NoteMathematical operations on measurements (anddisplayed data) after calibration are not correctedfor dispersion.Enter WAVEGUIDE into the standard

18S11A,B,C and S22A,B,CS11A, B,C and S22A,B,C correspond to the S11andS22reflection calibrations for port 1 and port 2respectively. These three classe

19TRL ThruTRL Thru corresponds to the measurement of theS-parameters of a zero-length or short thru connec-tion between port 1 and port 2. The Thru, R

233345577 8 9 9 911 12 12 12 14 14 15 16 16 17 17 17 18 18 18 18 19 19 19 19 19 20 20 20 21 21 22 22 22 23 23 26 29IntroductionMeasurement errors Meas

20Each adapter is specified as a single delay/thrustandard and up to seven standards numbers canbe specified into the adapter class.Standard Class lab

21Again, cal kit labels should be chosen to bestdescribe the calibration devices. The “B.1” defaultsuffix corresponds to the kit’s mechanical revision

22User modified cal kits and Agilent 8510 specificationsAs noted previously, the resultant accuracy of the8510 when used with any calibration kit is d

23Appendix ACalibration kit entry procedureCalibration kit specifications can be entered intothe Agilent 8510 using the 8510 disk drive, a diskdrive c

24Front panel procedure: (P-band waveguide example)1. Prior to modifying or generating a cal kit, storeone or both of the cal kits in the 8510’s non-v

254. Change the class label for S11A: LABEL CLASS,S11A, ERASE TITLE.5. Enter the label of PSHORT 1 by using the knob,the SELECT soft key and the SPACE

26Appendix BDimensional considerations in coaxial connectorsThis appendix describes dimensional considera-tions and required conventions used in deter

27Female type-NMale type-N7 mm Coaxial connectorType-N coaxial connector interfaceThe location of the “calibration plane” in Type-N standards is the o

28

29Appendix CCal coefficients modelOffset devices like offset shorts and offset opens canbe modeled by the following signal flow graph :Figure 1 Signal

3IntroductionThis product note covers measurement calibrationrequirements for the Agilent 8510B/C networkanalyzer. All of the capabilities described i

30Their first order approximations, R is small and G=0, are:Equation 3Since Equation 4For coaxial devices

31then:Equation 5Equation 6If the Offset delay=0, then the coefficient of reflection,Γ = ΓL.

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4The array coefficients are computed by measuringa set of “known” devices connected at a fixed pointand solving as the vector difference between themo

5Standard definitionStandard definition is the process of mathematical-ly modeling the electrical characteristics (delay,attenuation and impedance) of

6Table 1. Standard definitions tableTable 2. Standard class assignments

7Modification procedureCalibration kit modification provides the capabilityto adapt to measurement calibrations in other con-nector types or to genera

8Define standardsA glossary of standard definition parameters usedwith the Agilent 8510 is included in this section.Each parameter is described and ap

9Each standard is described using the StandardDefinition Table in accordance with the 1- or 2-port model. The Standard Definition table for awaveguide