Abstract
When a modulated Bayard-Alpert gauge is used in the Redhead 1 mode three phenomena occur which may introduce errors into a pressure measurement: (i) the modulation factor may vary with gas and emission ; (ii) pressure changes may occur in the system ; (iii) the residual current may be modulated. Experimental results are presented on the magnitude of effects (i) and (ii). A new method of using a modulated Bayard-Alpert gauge is suggested which reduces the magnitude of the previously listed effects while maintaining the advantage of a high modulation factor.
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