CAPINTEC, INC. CAPTUS
®
3000
MANUAL CALIBRATION
MCA mode can also be displayed from the Autocalibration screen (CHAPTER 5: QUALITY
ASSURANCE). If Autocalibration is not successful click the
button or press
Alt+M on the Auto Calibration screen. The MCA mode screen for Manual Calibration will
appear as illustrated in Figure 13-18.
Figure 13-18
To perform calibration, use the Cesium 137 rod source to provide two peaks of known
energy. To acquire and clear spectra, click the
and buttons.
Set the Gain and Zero Offset at low values. Gradually increase the Gain until the 662 keV
peak is near channel 331. Adjust the Zero Offset so that the 32 keV peak is visible. Several
iterations of Gain and Zero Offset adjustments may be required. If the Gain and Zero Offset
adjustments are unable to position the peaks correctly, adjust the High Voltage. Repeat this
energy calibration procedure until the peaks are positioned as required.
Click the
button to store the calibrated settings for all modules of the CAPTUS
®
3000 system. Settings will be saved for the selected detector only.
Note: Once calibration settings are saved in the MCA for Manual Calibration Screen,
these will serve as a baseline for Autocalibration, which can be reattempted if it failed
initially. These settings will only serve as a baseline for Autocalibration. They will not
apply to other program modules.
November 13 MCA 13-17
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