The gravimeter's quartz system is in air-tight sealea cases, used to be considered no pressure effects.
The present experiment with 8 quartz gravimeter(2 Scientrex CG-2, 3 ZSM-3, 3 Worden)indicate that there is significant reletivity between the pressure variation and the reading of gravimeters, but the gravimeters have different regression coefficients. It is necessary to correct the pressure effect from gravity measurement result.
The authors wonder if there is a better method than calibrating gravimeters by gravity difference caused by altitude difference.