Nanometrics Dataloggers

These responses apply to all standard-gain models of Centaurs. The high-gain Centaur models are in a different section of this library. Centaur digitizer technology is also used within all-in-one instruments such as the TitanSMA, TitanEA, Meridian Compact and Meridian Posthole, and the responses of the digitizer portion of those sensor-digitizer instruments are found in their respective sections of this library.

Preamp Gains: When configuring the Centaur, the user sets the input voltage range, which translates to choosing a preamplifier gain. Input range values of 40, 20, 10, 4, 2, and 1 Vpp correspond to gains of 1, 2, 4, 10, 20, and 40 respectively.

Decimation Filter Type: The operator can configure the digitizer to use linear-phase or minimum-phase decimation filters. Responses incorporating linear-phase and minimum-phase filters are given below.

Optional IIR DC Removal Filter: The responses given here that include the final IIR DC removal filter assume the operator has configured a first-order highpass filter with a low-frequency corner of 1 mHz (0.001 Hz). For other corner frequency values of a first-order filter, the pole in the last (nonzero) stage should instead be set to that corner frequency times 2 * pi. Other filtering options may be selected by the operator, in which case it is best to use the response generation feature available from within the instrument's user interface, or request a custom response from Nanometrics technical support.

Mary Templeton 11/15/2018