An attenuator is a device that allows reduction of known signal level by a predetermined factor. This change of signal level is often expressed in decibel(dB). An attenuator provides certain amount of isolation between instruments, thus reducing measurement interaction. This can be done by attenuating the unwanted reflected signal due to imperfect matching. In addition to that, it can be used for impedance matching of sources and loads.
Two Types of Mechanical Attenuator1. Programmable Step Attenuator
Programmable Step Attenuator mostly designed together with the driving circuit and driving methodologies. The driving circuit can be either PCB board that consist of electronic components such as IC, resistor, capacitor etc. to provide current interrupt, and also Y-contact board that consist of mechanical part called Y-Contact to provide the needed current interrrupt.
2. Manual Step Attenuator
The only different between manual and programmable attenuator is the driving method. The attenuation change in a programmable attenuator is driven by the DC section (PCBA) while for attenuation change in a manual attenuator can be achieved by turning the cam assembly through the Turning Knob.
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