Over what range can Precision Acoustics calibrate hydrophones?
In order to calibrate hydrophones Precision Acoustics must have reference hydrophones that are calibrated over the same range. Precision Acoustics has suitable reference hydrophones calibrated at NPL in London which allows us to calibrate over the range 1-20MHz in 1MHz increments. For calibrations outside this range we can arange calibrations at PTB, Germany or NPL, London. See our calibrations price list for available options.
How large are the uncertainties in the calibration results?
NPL uncertianities typically are 7-12% depending on the frequency of the calibration. Precision Acoustics uncertainties are higher, as our references are secondary hydrophones which have been calibrated at NPL and we have to include the NPL uncertainties within our results.