SRS Labs QMS 100 Series, User Manual

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RGA Command Set 3-61
Technical Reference
non-volatile memory of the RGA, to calculate the 8 bit settings of the DAC according to the linear
equation:
DAC8 (m) = DS
.
m + DI
where m is the mass in amu, and DAC8(m) is the 8 bit setting at that mass.
The purpose of the Peak Width Tuning Procedure is to determine the values of DI and DS so
that all the peaks in an analog spectrum have the desired peak width (typically 1 amu).
The DI command is used to program the value of the DI peak tuning parameter during the Peak Width
Tuning Procedure. The value is saved in the non-volatile memory of the RGA ECU and used by the
firmware to generate DAC8(m) during measurements.
Note to Supervisors : A calibration disable jumper (JP100) available on the circuit board can be used by
a supervisor to block any attempt to modify the value of the DI parameter. Supervisors may use this
feature to prevent accidental changes in the calibration parameters by inexperienced operators. Setting
JP100 will disable peak tuning of the ECU.
Parameters:
DIparam, param: 0 - 255:
If Calibration is enabled by the jumper JP100 (See CE Command) the value
of DI in non-volatile memory is updated and the internal scan parameters used to program the DC during
scans and single mass measurements are updated accordingly.
DI* : Use this format to replace the peak tuning parameter with the original factory setting for DI. The
factory value is retrieved from memory, and used as the new parameter value to excecute the command
as above
DI? : Query. Returns over RS232 the value of DI currently stored in memory.
Error checking:
The absence of a parameter (i. e. DI) is treated as an error in the parameter.
This parameter is protected by an internal jumper (JP100) and a Protection-Violation error will result if the
jumper is in the Calibration Disable mode (See CE command).
DSparam, param: -0.8500 - +0.8500, *, ?
Description : DS Parameter adjust (Peak Width Tuning command).
JP100 Jumper protected.
Echo: Query Response.
Important:
RGA200 DS range: -1.2750 - +1.2750
RGA100 DS range: -2.5500 - +2.5500