
Chapter 6
74
Figure 20: Continuously Paced Scan Mode
Triggered Scan Mode
DT3000 Series boards support two triggered scan modes: software retriggered and externally
retriggered. These modes are described in the following subsections.
Software-Retriggered Scan Mode
Use software-retriggered scan mode if you want to accurately control both the period between
conversions of individual channels in a scan and the period between each scan. Specify any
supported trigger source as the initial trigger. The retrigger source is the retrigger clock on the
board.
When it detects an initial trigger, the board scans the channel list once, then waits for a
software retrigger to occur. When the board detects a software retrigger, the board scans the
channel list once, then waits for another software retrigger to occur. The process repeats
continuously until either the allocated buffers are filled or until you stop the operation; refer
to
page 77
for more information on buffers.
The sample rate is determined by the frequency of the A/D sample clock divided by the
number of entries in the channel list; refer to
page 71
for more information on the A/D sample
clock. The conversion rate of each scan is determined by the frequency of the 16-bit A/D
Trigger Clock (with 4-bit prescaler) on the board; it uses a 10 MHz timebase.
Using software, specify the frequency of the software retrigger. The minimum retrigger
frequency is 9.54 Hz. The maximum retrigger frequency varies depending on the board type,
as shown in
Table 6
.
Table 6: Maximum Retrigger Frequency
Board
Single Channel
Retrigger Frequency
a
Multiple Channel
Retrigger Frequency
a
DT3001
330 kHz
250 kHz
DT3001-PGL
330 kHz
250 kHz
b
DT3002
330 kHz
100 kHz
Trigger occurs
Chan 0
Chan 1
Chan 2 Chan 0
Chan 1
Chan 2 Chan 0
Chan 1
Chan 2 Chan 0
Chan 1
Chan 2
A/D
Sample
Clock
Post-trigger data acquired
continuously
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Содержание DT3000 Series
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