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information shown in the upper half of the application window does not change right after

ﬂashing a new ﬁrmware.

2.6.1 Calibrating the TDC

After each update of the Ndigo250M-14 ﬁrmware the TDC has to be calibrated. The calibration

is done with the tool “TDC Calibration.exe” which is available after installing the Ndigo device

driver. After invoking the application a window as shown in Figure 2.21 will appear.

Figure 2.21: The TDC calibration tool as provided with the Ndigo device driver.

The calibration procedure is as follows:

1. Connect an external pulse signal to the Trigger input. The signal should be low active

with a frequency in the kHz range. It must not be synchronized to the clock source of the

Ndigo250M-14. The input frequency must not exceed 10 MHz. The pulse low and high

width has to be at least 10ns each.

2. Set Serial Number according to the sticker on the card if the shown value is not correct.

3. Start capturing pulse events by pressing the Start button.

4. Adjust the Input Oﬀset so that First Bin is in the range of 4 to 16. First Bin is less than

4, increment Input Oﬀset by one. If First Bin is greater than 16 decrement Input Oﬀset

by one. Repeat increment/decrement until First Bin is in the range of 4 to 16. Depending

on the ﬁrmware revision the Input Oﬀset value for a successful calibration may be in the

range of 6 to 10 or 28 to 32.

5. When the Write Calibration Data button becomes enabled press it to update the calibra-

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