Stanford Research Systems RGA100, Operating Manual And Programming Reference

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9-10 Built-in Hardware Checks
SRS Residual Gas Analyzer
Built-in Hardware Checks
Several firmware driven hardware checks are built into the RGA Head. Some checks are
automatically performed as soon as the unit is powered up (i.e. Power-on checks), and
others are activated when the emission from the ionizer is turned on (i.e. filament’’s
Background Protection Mode). Most of the checks can be triggered by query commands
(i.e. Error Reporting Commands) at any time.
This section describes the internal checks, based on the hardware components they test.
The information presented includes:
x
The type of check performed.
x
The bit of Status affected.
x
The specific Error Byte affected (See Error Byte Definitions).
x
The query command that can be used to trigger the check (see Error Reporting
Commands.)
x
The prefix of the Error Codes associated to the check.
x
Is this a Power-on check?
24V DC Power Supply
STATUS Bit affected: 6
Error Byte affected: PS_ERR
Error Reporting Command: EP?
Error Codes prefix: PS
Power-on check?: Yes
The output of the external 24 V DC Power Supply must be between 22 and 26 Volts at all
times while the RGA is in operation. Its voltage level is automatically tested when the
instrument is turned on and can be checked at any time with the query command: EP?.
The same test is performed in units with built-in power modules (Option 02) to check the
voltage output of the internal switching power supply. If a voltage out of the allowable
range is found, the POWER LED is turned off, , the red Error LED is turned on, Bit 6 of
STATUS is set, and PS_ERR is updated to indicate the specific problem.
Electrometer
STATUS Bit affected: 5
Error Byte affected: DET_ERR
Error Reporting Command: ED?
Error Codes prefix: DET