GBS Elektronik MCA 166 - Manual (Page 31)

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Channel 1
Enter lower channel number (in manual mode only) and the corresponding energy.
Channel 2
Enter upper channel number (in manual mode only) and the corresponding energy.
Do visual calibration (not in manual mode)
Switches to a graphic screen to do the energy calibration. In cursor mode it is asked for
two cursor positions, in centroid mode it is asked for two calibration peak ROIs.
Input Coefficients (manual mode only)
Enter the slope in keV/channel and the offset in keV. “Actual Calibration” shows the actual
used calibration coefficients.
3.3.4 Help
You can get a short help screen by moving the cursor to the menu item you want more
information about and pressing F1. The help menu gives also information about the used
software version (command: about). The Help menu is context sensitive. To get help on a
certain function - press F1 - and a context sensitive message will pop up. If the Help text
exceeds the length of the screen, use the arrow keys to scroll. Use ESC to leave a Help
screen and return to the menu. The Help menu also includes a MCA Diagnostics screen.
3.3.4.1 Diagnostics
Shows useful information about the attached Mini MCA (serial number, hardware version,
firmware version, voltages and currents). Also displayed is the actual MCA Battery voltage
and current. A blinking current value means overload or low battery voltage. All battery
currents used for the preamplifier supply voltages and for high voltage are shown.
Remember: The currents are battery currents and not the actual currents at +/- 12V and
+/- 24V or high voltage currents.
To get an idea of the actual currents, a converter efficiency of about 80% can be
assumed. The following formula will help:
I I
U
U
aus Batt
Batt
aus
= 0 8 . * *
If now, for example a current off 120 mA is shown for the +24V, and the actual battery
voltage is 7.5 V, then the current at the +24V output is approximately:
I mA
V
V
mA
aus
= = 0 8 120
7 5
24
30 . * *
.
3.4 The DOS program MCS for time dependent measurements (Multi
Channel Scaler)
Overview:
This program supports semi-automated measurements of time distributions with any
radiation detector (HPGe, NaI, CdTe, CdZnTe and neutron counters), as e.g. used for
CANDU canister verification. In the most convenient mode of operation only the F4