| 摘要 |
The invention relates to dealing with an effect of ambient conditions on operation of an installation in response to a physical action. By way of example, when the installation is a measuring installation, master circuitry (12) is used in measuring a physical action. Control circuitry (32) matching the master circuitry is isolated from the physical action. The master and control circuitry, in close physical relationship, are similarly subjected to ambient conditions. An actual output and an expected output f the control circuitry are compared and a discrepancy is detected. The output of the master circuitry (12) is modified in accordance with said discrepancy, for example to compensate for the effect of the ambient conditions, or to cancel recorded n of an erroneous measurement.
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