Owner's manual

30 Function Block and Operation Theory

4.3.4 Sampling Rate Control

By specifying different scan interval counter (32-bit) value, differ-

ent sam-pling rate can be achieved. The following formula deter-

mines the ADC sampling rate. Sampling Rate = TIMEBASE/Scan-

Intrv Where ScanIntrv is scan interval counter, value can be 4, 5,

6, 7, .... 2

32-1

Figure 4-5: Configuring Different Sampling Rate of PXI-2022.

4.3.5 Timebase Exporting

The PXI-2020/2022 can export timebase to one of the PXI trigger

bus line 0. By software programming, you can pick up a trigger line

to transmit timebase clock. This feature is very useful when syn-

chronize to multiple measurement modules.

TIMEBASE

DATA

Acquisition

In Progress

Trigger

Acquisition starts right after this clock edge

ScanIntrv = 1

D10

D2 D3 D4 D5 D6

D2 D3 D4

ScanIntrv = 2

ScanIntrv = 3