Signal Calibration

Analyses yield data on signal reading, peak area, temperature, and time. These data are sufficient for many applications, however volume data may also be needed.

It is not necessary to perform a calibration if volume data are not needed. If volume data are needed, calibration may be performed either before or after the analysis. NOTE: This does not apply to loop calibration, ambient temperature, and atmospheric pressure.

A group of automatic calibration routines are provided in the form of specialized experiment steps. A calibration run is an analysis using one of these experiment steps. The calibration run can be performed before or after the sample analysis and can be included as a step within the analysis, or it can be performed as a separate analysis.

After the sample data and calibration data are collected, the calibration file is associated with the sample file, and the sample data are converted to volume. A single calibration run can be associated with an unlimited number of sample data files. For example — TPR yields peak area and the temperature(s) at which maximum reduction occurs. To obtain the volume of gas uptake, a calibration file must be associated with the analysis file, then reports are created in which the area data are converted to volume data.

A calibration file can be associated with a sample file by:

  • going to Options > Signal Calibration > Defaults and selecting a default calibration file for each experiment type,
  • using the default file or choose a different file in the Unit [n] > Sample Analysis window.
  • clicking Set Calibration on the Peak Editor window and select from a list of calibration files that were created after the sample file was used in an analysis.

Create a New Signal Calibration File

When selecting a Signal Type and Type of Calibration, only those options used in the original analysis are enabled on the right side of the window.

  1. Select the sample file to be used for the new signal calibration file.
  2. Select the Signal Type and Type of Calibration options to include in the new calibration file. As these selections are made, the experiments from the selected analysis file display on the right side of the window. Only those experiments applicable to the selected signal type and calibration type are enabled. Click OK.
  3. If prompted, enter the active gas concentration in the carrier gas and in the loop gas. Click OK.

Signal Calibration Fields and Buttons Table
Field or Button Description
Degree [drop‑down box] Select the power to display in the Coefficients list.
Delete Peak [button] To remove a peak from the peak table, select the peak and click Delete Peak.
Description [text box] Enter a description of the file.
Include origin [check box] Enables or disables the original in the graph.
Load Calibration Data [button] Use to enter calibration data from a selected file.
  For fields and buttons not listed in this table, see Common Fields and Buttons.

Repeat this process for each gas concentration in the calibration. For example — if gas concentrations of 10%, 20%, and 30% are used, mark the calibration peaks and create calibration files for each concentration.

Calculation used for peak volume:

For example, calculations for 1 cm3 injection, ambient temperature of 22 °C, ambient pressure of 740 mmHg:

Create a Signal Calibration Report

Select a previously defined signal calibration file from the drop-down list, then select the print destination.

Open a Signal Calibration File

Select a previously defined signal calibration file from the drop-down list. If a calibration file already exists, select the serial number from the drop-down serial number list. When a new calibration file is saved using a new serial number, the new serial number displays in the Serial Number drop-down list.

If this is the first calibration file to be saved, the Serial Number drop-down will not display until the first calibration file is saved.

List Signal Calibration Files

Displays a list view of previously defined signal calibrations for the selected serial number.

 
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