Agilent Technologies HP 8642A/B Specifiche Scaricare il pdf (Pagina 101)

100

101

NOTE

When loading a Result File for calculating Sigma vs. Tau,

the carrier frequency used for the measurement must be

entered in the Instrument Parameters display in order to

compute accurate values.

Detector/Discr. Input Frequency is the frequency of the input signal

connected to the HP 11848A's phase detector. The Detector/Discriminator

Input Frequency is used to:

• Select the appropriate Low Pass Filter (LPF) in the HP 11848A Phase

Noise Interface. For frequencies < 95 MHz, the system enables the

2 MHz LPF to eliminate feedthrough of the fundamental signal and

the additive products out of the phase detector. When the 2 MHz LPF

is enabled, the maximum offset frequency the system can measure is

2 MHz.

• Set the frequency of the Reference Source when the Reference Source

is under system control.

NOTE

When using an HP 11729C under System Control, the

HP 3048A will derive the correct Detector/Discr. Input

Frequency and enter it into the Instrument Parameter dis-

play. If the currently entered Detector/Discr. Input Fre-

quency is less than 95 MHz, and you are allowing the

HP 3048A to input the correct Detector/Discr. Input Fre-

quency by computing the value from a System Controlled

HP 11729C, then the measured offset range will be limited

to 2 MHz. To eliminate this problem, set the Detect/Discr.

Input Frequency to a frequency greater than 95 MHz.

2-32 instr. Params: $N w/o PLL

1 2 ... 96 97 98 99 100 101 102 103 104 105 106 ... 452 453

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Agilent Technologies HP 8642A/B Specifiche Pagina 101

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