digiBASE
®
PMT Base with Integrated Bias Supply, Preamplifier and Digital Multichannel Analyzer 931003E / 0620
A.3.4.5. PrepareMCB
Sub PrepareMCB(Index)
uConn21(Index).Comm “STOP”
uConn21(Index).Comm “CLEAR”
uConn21(Index).Comm “SET_MODE_LIST”
End Sub
This function sends the commands to prepare the digiBASE to collect List data. STOP stops and
acquisition in progress. CLEAR clears the data currently in the unit. SET_MODE_LIST puts the
digiBASE into List Mode.
A.3.4.6. RestoreMCB
Sub RestoreMCB(Index)
uConn21(Index).Comm “STOP”
uConn21(Index).Comm “SET_MODE_PHA”
End Sub
RestoreMCB puts the digiBASE back into normal pulse height analysis (PHA) mode. The
digiBASE must be in PHA mode for MAESTRO to function normally.
A.3.4.7. Performance
NOTE As mentioned previously, the maximum count rate the that can be attained without the
loss of data from the FIFO file is a function of the throughput capacity of USB; the
number of digiBASEs connected to the computer; and the speed, memory, and operat-
ing system that are employed for the measurement. The following performance descrip-
tion is designed to help you estimate the performance of your system.
Three digiBASEs were connected to the system. Suitable sources were placed on the detectors
such that 50 kcps were being placed in the histogram of each of the three detectors (150 kcps
total rate for all three). The program was able to read and store the data without loss of
information.
As a test of the maximum attainable rate, the rate on one of the detectors was increased to
100 kcps for a total rate of 200 kcps. The system once again did not lose information. The rate
was further increased until overflow of the FIFO began occurring. At that point, the combined
rate was 240 kcps. There was no other peripheral on the USB bus and the computer was
dedicated to running the program.
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