ORTEC
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EASY-MCA™ Digital Gamma-Ray Spectrometer User’s Manual
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SET_ROI start_chan,number_of_chans
Sets the ROI flags for the specified channels. This command can be used multiple times to
set ROI flags without affecting previously set flags. ROI flags specify channels within a
device that are considered for ROI integral and ROI peak presets.
SET_ROI_MDA start,numchans, [PeakNumber]
Sets the region to use to compute the gross counts in the MDA calculation. PeakNumber is
an optional parameter (assumed 0 if not present) that specifies which of up to 20 (0–19)
MDA Presets to change.
SET_ROI_UNCERTAINTY start, chans
Sets the region to be used for the uncertainty preset calculation. See also SHOW_ROI_
UNCERTAINTY.
SET_SEGMENT
Not used in the EASY-MCA; included for backward compatibility.
SET_TRUE ticks
Sets the true-time counter to the specified number of ticks. The number represents true time
in units of 20 ms (50 ticks/sec). Normally this value is set by the EASY-MCA during data
acquisition. See also CLEAR_COUNTERS and SHOW_TRUE.
SET_TRUE_PRESET ticks
Sets the true-time preset to the specified number of ticks (20 ms/tick). During data acquisi-
tion when the true-time counter reaches the preset number of ticks, the preset is complete
and the acquisition is stopped. Setting a true-time preset to 0 ticks disables the preset. See
also CLEAR_PRESETS and SHOW_TRUE_PRESET.
SET_ULD value
This sets the upper level discriminator to value, in channels.
SET_UNCERTAINTY_PRESET percent
Sets the uncertainty preset to the specified value in percent. Percent is a floating point value
from 0–99.9999. See also SHOW_UNCERTAINTY_PRESET.
SET_WINDOW [start, length]
Sets the window of interest to the specified start channel and number of channels. The chan-
nels of spectral data in the window of interest are affected by commands such as CLEAR,
SET_DATA, and WRITE. If neither start nor length is provided, the window is set to the
maximum size allowed by the conversion gain specified. The window of interest is always
set to the maximum size after a SET_DEVICE command or a SET_SEGMENT command.
