Measurement
The Measurement tab defines the measuring conditions and sets the total duration of the analysis. It is shared across all signals in multi-detector measurements. Using the Method – Measurement... command from the Instrument window opens the Method Setup on this tab.
Method Setup - Measurement
Displays a description of the method. When opening the method, this text appears in the Description field of the Open Method dialog.
Informational Fields
The following fields serve for recording descriptive information about the method. Their content has no influence on the actual course of the analysis.
- Column – Describes the column used.
- Mobile Phase – Describes the mobile phase used.
- Flow Rate – Indicates the mobile phase flow rate.
- Pressure – Indicates the mobile phase pressure.
- Detection – Describes the detector used.
- Temperature – Describes temperature parameters.
- Note – Optional field for entering any additional method-related information.
Enables automatic termination of the analysis once the time set in the Run Time field is reached.
Specifies how long the analysis should run, in minutes. Once the set time has elapsed, the analysis is automatically finished and the chromatogram is created. This field is only available if Enable Autostop is checked. Valid values range from 0.2 to 9999 minutes.
The Run Time must be set for all methods used in an Active sequence, as it defines the cycle duration.
Enables external synchronization of the analysis using an external start signal. Three operation modes are available:
- Start Only – A single external signal starts the analysis. Any further signals received during the run are ignored. This is the default mode used when a new method is created.
- Start – Restart – The external signal not only starts the analysis but can also restart it. The first signal starts the analysis, and the second signal stops the current run and immediately starts a new one. This allows continuous measurement. This mode is not supported by most directly controlled instruments.
- Start – Stop – Each external signal alternates the state of the analysis. The first signal starts it, the second stops it, the third starts it again, and so on.
The station can respond to two types of signal edge changes:
- Up – Triggered when the voltage changes from low (< 0.7 V) to high (> 3 V), typically corresponding to an opened contact.
- Down – Triggered when the voltage changes from high (> 3 V) to low (< 0.7 V), typically corresponding to a closed contact.