The TA197 is a passive 10:1 attenuator. This means that a 10 V signal at its input will appear as a 1 V signal on the output. The TA197 allows voltages of up to 400 V to be measured. The TA197 attenuator also increases the input impedance of the oscilloscope from 1 M to 8 M and can also be used when measuring the output of high-impedance sensors such as piezo knock sensors where connecting an automotive scope can attenuate the signal or induce a fault code.
