What is the output impedance of the Model 215X femtowatt receiver?
The Model 215X femtowatt photoreceiver has an output impedance of 100 W and a bandwidth of 750 Hz. For this sort of low-frequency measurement, the 100-W output impedance of the 215X does not need to be matched to the input impedance of the instrument that it is connected to. In fact, the receiver was designed to be connected to an instrument (such as an oscilloscope or a voltmeter) that has a high input impedance. Typically, the input impedance of these instruments is 1 MW . You can also use the Model 215X with an instrument that has a relatively low input impedance of 50 W or 1 KW. In the case of a 50-W input impedance, the voltage that you measure will be about 1/3 of the output voltage of the 2151. The reason for this is that the 100-W output impedance of the 215X and the 50-W input impedance of your instrument form a voltage divider.< /p> < h3> With the Model 2XXX receivers, how do I estimate what the output signal strength will be? For these models, the output voltage versus input
