SRS Labs QMS 100 Series, Руководство пользователя

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3-52 RGA Command Set
SRS QMS Gas Analyzer
Important: The voltage value is not used internally by the RGA to set the bias voltage of the Electron
Multiplier, it is simply stored so it can be read and used by a host computer.
As expected, this command is only available in ECU’s with a CDEM option installed (See MO command
for details).
Parameters:
MVparam, param: 0-2490: The parameter, interpreted as a CDEM bias voltage in units of Volts, is
stored in the non-volatile memory of the ECU.
MV?: CDEM Bias voltage query.
Error checking:
The absence of a parameter (i. e. MV) is treated as an error.
No default value is available.
A bad-command communications error is reported when this command is invoked in a unit with no CDEM
option installed.
SPparam, param:0.0000 - 10.0000, ?
Description : Partial Pressure Sensitivity Factor storage and query.
Echo: Query Response
Store a value of Partial Pressure Sensitivity, expressed in units of mA/Torr, in the non-volatile memory of
the RGA ECU.
Important: The sensitivity factor is not used internally by the RGA to turn ion currents into partial
pressures, it is simply stored in memory so it can be read and used by any host computer connected to the
instrument (See HV command.)
Partial Pressure Sensitivity factors are gas specific, probe specific, and highly dependent on the ionizer and
quadrupole mass filter conditions and on aging of the probe.
Note : The parameter value loaded at the factory is the partial pressure sensitivity factor for N
2
under
default ionizer conditions.
Parameters:
SPparam, param:0.0000 - 10.0000: The parameter, interpreted as a partial pressure senstivity factor in
units of mA/Torr, is stored in non-volatile memory of the ECU. . Typical value is 0.1 under default ionizer
settings.
SP?: Partial Pressure Sensitivity factor query.
Error checking:
Parameter must be within specified range.
No default value is available.