Cornelius DPC 230 Specifications download pdf (Page 47)

Configuring the SPCM Main Panel 41

instrument configurations several data sets may have been recorded. In this case click on the

display window that shows the data to be analysed, and then click on ‘Send Data to SPCI-

mage’, see Fig. 65. For details of the SPCImage data analysis, please see [4] and [6].

Fig. 65: Sending data to the data analysis. Click on data set to be sent (left), click on ‘send data to SPCImage’

(middle), SPCImage opens with the data selected (right)

Trace Statistics

Clicking on the ’Trace Statistics’ button opens a window which displays information about the

data shown in the curve windows. For decay curves or other waveforms the FWHM values,

the peak counts, the total counts and the first moment of the photon distribution are displayed,

see Fig. 66, left. For an FCS window the trace statistics window displays the results of the fit,

see Fig. 66, right.

Fig. 66: Trace statistics panel. Left for a waveform window, right for FCS window

The window can be placed anywhere in the screen area. Please note that the trace statistics

window works also in the oscilloscope mode. The window is thus an efficient tool to adjust

the system for best time resolution, correct the signal transit time, and optimise the counting

efficiency or IRF stability.

Status Information

Count Rate Display

The count rate display informs about the count rates of the two

TDCs of the DPC-230. Both rates are the total rates for all active

channels of the TDCs. Important: In contrast to the bh SPC mod-

ules the TDC chips have no counters to determine the count rates

directly. The count rates have therefore to be determined by the

SPCM software from the incoming photon data stream. Because

the photon data of each TDC are buffered in FIFO there may be

some latency in the count rate display.

FIFO Status

The status of the on-board FIFO buffers are displayed in the ‘De-

vice State’ window. The filling of the buffers is shown by ‘FIFO

Usage’. A FIFO overflow is shown by the indicator on top of the

FIFO usage bars. When an overflow occurs there is a gap in the

recorded photon data stream, and the absolute time scale may be

Fig. 67: Count Rate Display

Fig. 68: FIFO status

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Cornelius DPC 230 Specifications Page 47