Specifications

Description of the Single Sided Spur AM Detector
Calibration Method
A second RF signal generator and a directional coupler are required to
inject the calibration spur. The calibration spur should be adjusted to
approximately —40 dBc at an offset frequency that can be accurately
measured with the RF analyzer.
NOTE
The HP 3048A expects the DUT to be set to the same
power level as the calibration source prior to beginning the
measurement.
It is important to insure that the level of the calibration
spur is greater than any other spurious signals present in
the frequency spectrum.
When the Connect Diagram appears, the Calibr Process softkey will
provide access to the the Determination of Phase Detector Constant
display where the calibration spur values can be entered.
When the system measures the calibration spur, the analyzer does a
peak search over a frequency span of two times the entered spur offset
frequency. Once the spur has been located, the level of the spur is
measured and used to calculate the Detector Constant. (The HP 3048A
will inform you when to remove the calibration spur.)
Calibr Process: AM Noise 2-99