
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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