9nC/g nom. • 400g wt • 150°C Max. Temp.
Highest sensitivity multiple shear plate vibration transducer, intended for micro g level measurement. Virtual immunity to strain input side effects provides guarantee of low frequency measurement integrity. System noise level of 10-2pC is equivalent to 1µg. With bandwidth restricted to 2kHz, 1 octave below resonance, noise floor should be significantly below this. Noise level vs. upper corner frequency for the CA/04/N charge amplifier, A/800 source and nominal l0Mtr. cable is shown in Fig.1. Bear in mind that charge amplifier noise increases as a function of input capacitance - noise assessment should be made with the charge amplifier input correctly terminated. The transducer adds mass at its point of attachment to a structure, thus imposes a transparency constraint above which data corruption will be excessive.
The single degree of freedom example, ω = √S/M+M†where Mt represents the transducer mass, reduces ω by 3% for a transducer adding 10% to the structure mass. Application area of the A/800 is thus limited in scope to low level vibration surveys in the civil engineering and heavy engineering domain.