Agilent Technologies HP 8642A/B Especificaciones descargar pdf (Pagina 176)

100

101

NOTE

When measuring a Two Port device, the AM Noise con-

tribution of the Source can affect the measurement. It is

recommended that a Source with Low AM Noise be used

to ensure good results.

Phase Shifter: When the source frequency cannot be adjusted, a Phase

Shifter is required for achieving quadrature for the Residual Two Port

measurement.

DUT:

The DUT blocks allow for either one or two devices to be configured

in the measurement paths. The DUT blocks are positioned by pressing the

softkey. You must configure a device in both measurement paths

Place DUTs

when measuring devices that translate frequency or add large amounts of

phase delay. The physical connection of where the DUT is placed with

respect to the Phase Shifter is not important (unless the Two Port device

to be measured translates the frequency). In this case, the frequency range

of the Phase Shifter needs to be considered.

DUT placement is done only to help visualize the measurement config-

uration and specify a correct Connect Diagram including DUT's. DUT

placement has no affect on any facet of system operation.

Quadrature: The System allows you to specify how quadrature (90° phase

shift) will be set. Pressing the Quadr Method toggles the quadrature selection

between adjustment of the source frequency and the manual method. (If

the source is under System Control and entered in the System Control

Table, the frequency adjustment will be automatic.) The manual method

requires a phase shifter (or adjustable line stretcher) to achieve quadrature.

2-106 Source Control: $N w/o PLL

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