
Chapter 6
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External D/A Output Clock
The external D/A output clock is useful when you want to pace analog output operations at
rates not available with the internal D/A output clock, if you want to pace at uneven intervals,
or if you want to start pacing when an external event occurs.
Connect an external D/A output clock to screw terminal 74 on the DT740 screw terminal
panel, screw terminal 46 on the STP268 screw terminal panel (attached to connector J1), or
screw terminal 44 on the STP268-EC screw terminal panel. Conversions start on the falling
edge of the external D/A output clock signal.
Using software, specify the clock source as external. For DT3010 Series boards, the clock
frequency is always equal to the frequency of the external D/A output clock input signal that
you connect to the board through the screw terminal panel.
Trigger Sources
A trigger is an event that occurs based on a specified set of conditions. DT3010 Series boards
support the following trigger sources for analog output operations:
• Software trigger
• External digital (TTL) trigger
• Analog threshold trigger
This subsection describes these trigger sources in more detail.
Software Trigger
A software trigger event occurs when you start the analog output operation (the computer
issues a write to the board to begin conversions). Specify the software trigger source in
software.
External Digital (TTL) Trigger
For analog output operations, an external digital trigger event occurs when the DT3010 Series
board detects either a rising or falling edge on the External D/A TTL Trigger input signal
connected to screw terminal 75 on the DT740 screw terminal panel, screw terminal 45 on the
STP268 screw terminal panel (attached to connector J1), or screw terminal 10 on the
STP268-EC screw terminal panel. The trigger signal is TTL-compatible.
Using software, specify the trigger source as either an external, positive digital (TTL) trigger
for a rising-edge digital trigger (OL_TRG_EXTERN for DataAcq SDK users) or an external,
negative digital (TTL) trigger for a falling-edge digital trigger (OL_TRG_EXTRA for DataAcq
SDK users).
Содержание Data Translation DT3010 Series
Страница 2: ...DT3010 Series UM 16866 V User s Manual Title Page ...
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Страница 15: ...About this Manual 14 ...
Страница 16: ...15 1 Overview Features 16 Supported Software 18 Accessories 19 Getting Started Procedure 21 ...
Страница 23: ...Chapter 1 22 ...
Страница 24: ...Part 1 Getting Started ...
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Страница 37: ...Chapter 2 36 ...
Страница 49: ...Chapter 3 48 ...
Страница 91: ...Chapter 4 90 ...
Страница 102: ...Part 2 Using Your Board ...
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Страница 147: ...Chapter 6 146 ...
Страница 159: ...Chapter 7 158 ...
Страница 160: ...159 8 Calibration Calibrating the Analog Input Subsystem 161 Calibrating the Analog Output Subsystem 169 ...
Страница 176: ...175 9 Troubleshooting General Checklist 176 Technical Support 178 If Your Board Needs Factory Service 179 ...
Страница 181: ...Chapter 9 180 ...
Страница 193: ...Appendix A 192 ...
Страница 213: ...Appendix B 212 ...
Страница 231: ...Index 230 ...