Agilent Technologies HP 8642A/B Especificações descarregar pdf (Página 103)

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101

External Detectors

Using an External Phase Detector to measure a device with fundamental

frequency less than 5 MHz or greater than 18 GHz requires special

considerations. The HP 3048A limits the Detector/Disc. Input Frequency

range to from 5 MHz to 18 GHz. If you are measuring a device that

exceeds the limits of the Detector/Disc. Input Frequency, enter a frequency

of less than 95 MHz for a device with a frequency of less than 5 MHz to

enable the 2 MHZ LPF, or enter a frequency of greater than 95 MHz for a

device with a frequency greater than 18 GHz to remove the 2 MHZ LPF.

Also when measuring frequencies less than 5 MHz you must filter out the

fundamental feedthrough and additive product prior to the HP 11848A

Noise Input. This is necessary to prevent overloading.

2-34 Instr. Params: $N w/o PLL

rev.05SEP89

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