Stanford Research Systems RGA100, Operating Manual And Programming Reference

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Basic Troubleshooting 9-7
SRS Residual Gas Analyzer
causing severe overpressures.
If the pressure is OK ( i.e. <10
-4
Torr), check for shorts in the ionizer assembly.
Using an ohmmeter check the conductance between the ionizer’’s connectors and
the vacuum system. (The ionizer feedthrus can be easily identified using the
drawings in the RGA Assembly Chapter).
If a short is detected, remove the probe from the vacuum system , inspect the
ionizer and fix any shorts. Note: Use the information in the RGA Maintenance
chapter to remove the repeller and/or service the ionizer.
If the short is still present after that, remove the RGA Cover Nipple and inspect
the rest of the probe for other sources of shorts (i.e. misalignments, loose screws,
etc.). If no short is detected, the Thoria coating of the filament might be
damaged.
Inspect the filament (best with a magnifying glass) and look for large sections of
Thoria coating missing. If a problem is suspected replace the filament using the
procedure in the RGA Maintenance chapter. If the filament still does not turn on,
contact SRS.
Error Code:
FL7
Type of Error: Filament ““Background Protection Mode””.
Error Message: Filament Error: No filament detected.
Error Cause:
No filament was detected after an attempt was made to establish emission current
in the ionizer. The Error and Burnt LED’’s are turned on by this error.
Troubleshooting: A probe must be connected to the ECU.
The probe must have a filament.
The filament must have at least one intact (i.e. conductive) side. Use an ohmmeter
to check continuity across the filament (The two filament feedthrus can be easily
identified using the drawings in the RGA Assembly Chapter).
The probe must be correctly connected to the ECU. Tighten the locking screws of
the box
Error Code:
PS6
Type of Error: 24VDC P/S.
Error Message: External 24V P/S error: voltage <22V.
Error Cause:
Voltage output of 24VDC Power Supply is under the acceptable 22-26V DC
range. The Power LED is turned off and the Error LED is turned on instead.
Troubleshooting:
Check the voltage output of the external power supply with a voltmeter.
Adjust the voltage to 24 V in adjustable external supplies or replace the power
supply altogether if necessary.
Contact SRS if your unit has a built-in power supply (Option 02).