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A piezo electric transducer has the following parameter values:
Crystal capacitance = 10–9 F
Cable capacitance = 2 × 10–10 F
Charge sensitivity = 4 × 10–6 coulomb/cm
If the oscilloscope used for read-out has an input resistance of 1 MW in parallel with C = 4 × 10–10 F, then the voltage sensitivity constant will be
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- 2500 V/cm
- 3334 V/cm
- 4000 V/cm
- 4500 V/cm
Correct Option: A
Total capacitance = Crystal capacitance + Cable capacitance + Oscilloscope capacitance
= (10 + 2 + 4) × 10–10 F
Change sensitivity = 4 × 106 C/cm
| Voltage sensitivity = | ||
| Total capacitance |
| = | = 2500 V/cm | |
| 16 × 10–10 |
