
Chapter 6
114
External Digital (TTL) Trigger
For analog input operations, an external digital trigger event occurs when the DT3010 Series
board detects either a rising or falling edge on the External A/D TTL Trigger input signal
connected to screw terminal 77 on the DT740 screw terminal panel, screw terminal 49 on the
STP268 screw terminal panel (attached to connector J1), or screw terminal 14 on the
STP268-EC screw terminal panel. The trigger signal is TTL-compatible.
Using software, specify the trigger source as 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).
Note:
The DT3010-268 board provides an External A/D Trigger and Clock Enable signal.
You can use this signal to enable or disable the external digital trigger and the external A/D
sample clock. The External A/D Trigger and Clock Enable signal is pulled high on the
DT3010-268 by a 22 k
Ω
resistor.
A high signal enables both the external digital trigger and the external A/D sample clock,
while a low signal disables both the external digital trigger and the external A/D sample
clock.
Analog Threshold Trigger
For analog input operations, an analog trigger event occurs when the DT3010 Series detects a
transition from above a threshold level to below a threshold level (falling edge), or a transition
from below a threshold level to above a threshold level (rising edge). The following analog
threshold trigger sources are available:
•
External Analog Trigger input signal –
This trigger source is supported by the DataAcq
SDK; it is not supported by the DT-Open Layers Class Library.
Connect an external analog trigger signal to screw terminal 107 on the DT740 screw
terminal panel, screw terminal 39 on the STP268 screw terminal panel (attached to
connector J1), or screw terminal 15 on the STP268-EC screw terminal panel.
Using software, specify the trigger source as either a rising-edge (OL_TR1 for
DataAcq SDK users) or falling-edge analog threshold trigger (OL_TR2 for
DataAcq SDK users).
•
One of the analog input channels
after gain is applied (also called the output of the
programmable gain amplifier (PGA)
.
Using software, specify the trigger source as either a
positive threshold trigger or negative threshold trigger.
Using software, specify the analog input channel used as the analog threshold trigger as
the first channel in the channel list; refer to
for more information.
On DT3010 Series boards, the threshold level is set using a dedicated 8-bit DAC (the second
D/A subsystem). The hysteresis is fixed at 50 mV. Using software, program the threshold level
by writing a voltage value to this DAC; this value can range from –10 V to +10 V.
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 ...