Contec DIG-100M1002-PCI User Manual page 35

3. External Connection
The reference clock is a period signal that becomes the standard of the sampling period.
It is possible to expand the number of channels by the synchronization between external instrument or
another board with the same type by the reference clock, and measure the mixed signal by the
synchronization between other measurement instrument.
Moveover, it is also used in the case of performing sampling at a more accurate period supplied by
frequency standards etc.
Input
Connector
CLK can be selected besides the reference clock from outside.
Output
Connector
Figure 3.9. Connecting the Reference Clock
Reference
For the input / output condition of reference clock, see "Reference Clock I/O" in Chapter 6 "About
Hardware".
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Input circuit
Output circuit
CLK
PLL circuit AD converter
CLK
PLL circuit Oscillator
DIG-100M1002-PCI