Stanford Research Systems RGA100, Operating Manual And Programming Reference

Page: 203 / 362

Filament Replacement 8-13
SRS Residual Gas Analyzer
15. Visually inspect the filament alignment and do any adjustments that might be
necessary. The filament should form a circle around the anode grid. Slight bends in
the filament are common, and do not compromise its performance. Severe bends
might result in electrical-shorts to the repeller and anode grid and need to be
corrected. Use gentle pressure on the filament wire to bend it back into its correct
shape if needed (Note: use a clean cotton swab for this procedure).
16. Attach the repeller to the longer filament rod using a fresh screw. Align the cage and
tighten the screw (Correct alignment is best assured when the two small holes on the
side of the repeller cage line up with the filament screws.)
17. Inspect visually the entire ionizer assembly to assure its correct alignment, and, if
satisfied, mount the probe back on the vacuum system. Check the correct rotational
orientation of the probe (i.e. same as it was before disassembly) before tightening the
flange bolts.
18. A bakeout of the probe is recommended before operating the RGA again.