Abstract
This paper describes a study on the possible sources of systematic errors during the calibration of accelerometers at low-frequencies. This study was carried out on a primary calibration system that uses an air-bearing vibration exciter APS Dynamics 129 and applying the sine-approximation method. Tests performed and actions taken to reduce the effect on experimental results are presented.
Highlights
The warp of the linear guide can cause a tilt with variable angle of the moving table when it is linearly translated
The changes are caused by the combination of longer displacements and change of gravity effect due to different angle of the accelerometer while it moves along the linear guide
SUMMARY Small deviations from a purely straight linear motion can cause systematic errors on the calibration of dc-responsive accelerometers at lowfrequencies due to the effect of local gravity. This problem was studied at INMETRO, where differences as large as 0.85% were observed on primary calibration of accelerometers at 0.1 Hz
Summary
The warp of the linear guide can cause a tilt with variable angle of the moving table when it is linearly translated This might cause a variable effect of local gravity on dc-responsive accelerometers as for instance servo-accelerometers. For the key comparison CCAUV.V-K3 [2], INMETRO have reported results down to 0.2 Hz. Later on, some efforts were made to extend the lower limit range to 0.1 Hz but the systematic effect was high compared to the desired uncertainty for the service. Some efforts were made to extend the lower limit range to 0.1 Hz but the systematic effect was high compared to the desired uncertainty for the service This was confirmed during a measurement audit carried out during the peer review of Lavib. Some experiments were carried out to respond to these questions and the results obtained will be presented
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