1、 Gauge Quick Use Guide Quick reference for setting extractor gauge calibration factor and troubleshooting RGAs. Motivation This aims to be a quick instruction guide on how to set the extractor gauge calibration factor in the IM 520 controller unit and the proper sequence for using an RGA along with
2、troubleshooting for when there are problems with the RGA Extractor Gauge Calibration Factor 1. Hit the Para button then hit the up arrow 2. Hit Para 4x to access “_._ CE ” screen 3. Adjust cal factor to specified value for that gauge using up/down arrows 4. Hold Para button until it flashes, then fi
3、nishes flashing (10 seconds) to store 5. Press Auto button to get back to measurement RGA Usage and Troubleshooting 1. Connect, making sure to use “com1” instead of “soft0” 2. Filament on 3. Mass scan in faraday cup (FC) mode this ensures that the Channel electron multiplier (CEM) isnt turned on whe
4、n the pressure is to high 4. If nonsense in FC mode JLab-TN-09-045 10 August 2009 Marcy Stutzman 2 a. Is the pressure below 1x10-10 Torr (good baked chamber, NEG pumps working)? The FC cant resolve this, use CEM mode b. Should the pressure be above 1x10-10 Torr? If so, things to try i. Calibrate hea
5、d (head menu, calibrate) ii. Degas the head iii. Try a different electronics unit 5. If the peaks are below 1x10-6 Torr, turn on the CEM 6. If nonsense in CEM mode a. Try average function in Utility menu turning on an average of 12 linear will average 12 runs and peaks will become distinct from nois
6、e b. If pressure is high enough (10-10 Torr or more), try adjusting CEM parameters in the Head menu. The “calibrate head” option calibrates the FC readback vs. an internal calibration, then the calibrate CEM gets the CEM output to match the FC output by adjusting CEM Bias and gain. This cant be done
7、 unless the FC can read something, and youll get errors like “cant calibrate below x-13Amps. c. Try a different electronics head even with a good FC reading, the CEM bias voltage in the electronics may be bad. d. There are ways to adjust the voltage/gain in the labview interface to the RGA Marcy can help if necessary and try to diagnose and repair electronics units or replace filaments as they wear out.
