Precision ion vacuum gage with logarithmic response
Abstract
A new ion vacuum gage controller has been developed of use with Bayard-Alpert gage tubes. The instrument employs a logarithmic-gain electrometer to cover up to 12 decades of pressure without the gain range changing. Instrument error and repeatability is + or - 1% of the pressure reading over a 9-decade pressure range with an ideal Bayard-Alpert gage tube. The instrument also offers selectable autoranging of fixed emission-current control. Furthermore, protection circuits and a computer interface are provided.
- Publication:
-
NASA STI/Recon Technical Report N
- Pub Date:
- June 1985
- Bibcode:
- 1985STIN...8612588D
- Keywords:
-
- Bayard-Alpert Ionization Gages;
- Control Equipment;
- Design Analysis;
- Electrometers;
- Engineering Drawings;
- Ionization Gages;
- Precision;
- Vacuum Gages;
- Fabrication;
- Installing;
- Responses;
- Running;
- Instrumentation and Photography