Agilent Technologies HP 8642A/B Dokumentacja Pobierz pdf (Strona 94)

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101

Measuring the VCO Tuning Constant

The following procedure describes the HP 3048A process for measuring

the VCO Tuning Constant.

The HP 3048A drives the VCO's tune port to -45%, -15%, +15%,

+45%

of the defined Voltage Tuning Range and measures the fre-

quency of the beatnote at each of these settings.

The ±15% frequencies are used to derive the limits for the ±45%

frequencies. The HP 3048A requires that at ±45% of the Voltage

Tuning Range the VCO's tuning response must be within 1.5 to 6 times

the frequency of the ±15% points.

The HP 3048A verifies that the frequencies measured at ±45% of the

Voltage Tuning Range are within these computed limits.

NOTE

The VCO Tuning Constant must be monotonic and have a

slope other than zero in addition to meeting the linearity

requirements.

If the ±45% points are within the limits, the system uses the slope

between the ±15% points as the VCO Tuning Constant.

Center Frequencies not at Center Voltage

If the center frequency for the measurement (fa) is not at the specified

center voltage, then the fa and fa frequencies must be translated relative

to the center frequency offset as well as the ±45% limits.

rev.05SEP89

Instr. Params: $N w/PLL 2-25

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