Chapter 4
Measurements
Introduction
This chapter provides a description of the Site Master measurement functions and examples of frequency domain, distance domain, and
Measurement Functions
Site Master operation is divided into four measurement modes: frequency domain, distance domain,
Frequency domain measurements consist of Return Loss (RL), Standing Wave Ratio (SWR), and Cable Loss (CL) made over a selectable frequency range. SWR and RL char- acterize the magnitude of reflections present in a device or transmission line. CL mea- surements display the insertion loss of a transmission line over frequency.
Distance domain
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measurement. The gain or loss measurement is made over a selectable frequency range |
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and the magnitude in dB characterizes the performance of the device under test. Gain and | 4 |
loss measurement includes Tower Mount Amplifier (TMA) verification, an- | |
Power monitor measurements can be either absolute or relative to some base power level, |
and can be displayed in either dBm or Watts. To allow measurement and display of power levels above the unit's specified input, the user may attenuate the signal and enter the corresponding offset. The offset is added to the measured input power prior to dis- play. Finally, a zero adjust function is provided to allow subtraction of an inherent “noise” level prior to display.
CAUTION: The measurement system MUST be calibrated at the ambient tem- perature prior to making a measurement. You must calibrate when the setup frequency is changed. Calibrations are stored with each of the setups.
It is recommended that the appropriate calibration,