Decibels, Filters and Sensors Quiz

Filter cut-off frequencies are often defined by the "Half Power" point. How many dB drop is there at the half power point?

The half power point of a filter is described by a -3dB reduction in amplitude. By what factor is the voltage reduced at the half power point?

If I have a 100 mV/g accelerometer that is putting out 200 Mv of electricity, how many g's of vibration is the sensor experiencing?

A 100 mV/g accelerometer was putting out a voltage of 100 mV. Now it is putting out 200 mV. How much of an increase is this in dB?

You are looking at a vibration FFT where the vertical scale is given in decibels. A peak has increased by 2 dB. If the initial reading was 1 g and if we are using a 100 mV/g sensor. What is the new reading in g's?

A 3 dB point is often used to define the limits of a sensor. The +3 dB point in an accelerometer is usually related to the sensors' _________

The sensitivity of an accelerometer (eg 10 mV/g) is typically defined by putting 1 g into the sensor using a shaker at _________ and measuring its response.

In its linear range, one would expect an accelerometer to not vary in amplitude by more than _____