783620H / 1013 3. GETTING STARTED — A GAMMAVISION TUTORIAL
The GammaVision installation program will have already located the Detectors available to this
PC. Click the Detector pick list on the right of the toolbar and select a Detector. The spectrum displays will update to show the data in this Detector.
In the simplest mode of operation, data acquisition is started from the toolbar; simply click the Start button.
You can use the Acquire menu (Fig. 36) to check the analysis settings while data is being gathered. After acquisition stops, the analysis can proceed.
All of GammaVision’s hardware setup controls are now in one, MCB-specific dialog. Depending on your Detector, this might include controls for conversion gain, amplifier, high voltage, shaping, data acquisition presets, and more.
To access this dialog, click Acquire/MCB Properties..., or right-click the mouse anywhere in the spectrum window to open its menu and select MCB Properties.
Fig. 36. Acquire Menu.
Some of the Detector’s internal parameters can only be changed when the Detector is not acquiring data. To see if the Detector is in acquisition mode, open the Acquire menu look at the menu items. If Stop is black and Start is gray (see Fig. 36), the Detector is in acquisition mode (even if no counts are accumulating in the MCB at the moment). If this is the case, select Stop from the menu or toolbar.
3.2.9.1. Conversion Gain
If you wish to change the conversion gain, click Acquire/MCB
Properties..., select the ADC tab
(Fig. 37), then change the Conver-
sion Gain field. The ADC gain is stored in the MCB and automatically recalled from the MCB the next time you restart GammaVision. Note that in this example, we are using a
DSPEC-50, and that the Properties dialog automatically displays only data fields that are applicable to this
MCB.
Fig. 37. Setting the DSPEC-50 Conversion Gain.
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