This page describes some of the built-in commands that can be used to change data collection and other settings.

Data Collection

Selecting Inter-scan Period

The period between scans is controlled by the algorithm, and there are 4 different controlling states. These states can be started with the commands:

> SWStat Chop Start 1 Minute Scan Interval
> SWStat Chop Start 5 Minute Scan Interval
> SWStat Chop Start 10 Minute Scan Interval
> SWStat Chop Start 30 Minute Scan Interval

Each of these begins with a scan, wait for the new online position to be calculated and set, then goes into chop mode, returning to start another scan after the appropriate interval. In all cases, a new scan can be triggered early by issuing the command:

> SWStat Time Warp

Dithering while chopping

Dithering the online position can be enabled or disabled with the commands:

> SWStat Chop Dither Enable
> SWStat Chop Dither Disable

The default currently is disabled.

Peak Detection Enable/Disable

By default, a new online position is calculated and set at the conclusion of any scan. This behavior can be enabled or disabled with the commands:

> SWStat Peak Detect Disable
> SWStat Peak Detect Enable

Mass Flow Controller (MFC) Control and Valves

January 2021: The calibration box on FILIF currently has only one valve installed (Valve 1). In theory, another valve could be easily added to FILIF and would be assigned Valve 2. Another valve control board would need to be installed (see Marco Rivero for more info).

Set Flow Setpoints

For any of the MFCs installed on FILIF (bypass: 10000 sccm full scale, zero: 5000 sccm full scale, and span: 500 sccm full scale), their setpoints can be set manually by the following command:

flow [Bypass,Span,Zero] Set [SCCM,Volts] NUM_VALUE where sccm is an integer that ranges from zero to the MFCs full-scale value. You can also set a voltage by simply typing in a decimal voltage between 0V (closed) and 5V (full scale).

Valve On/Off

With the current plumbing in the calibration box, Valve 1 must be turned on for the Zero and Span MFCs to exhibit a non-zero gas flow. The command is simply valve [1,2] [On/Off]