Keithley KPCI-3110, Руководство пользователя

Страница: 60 / 158

2-36 Functional Description KPCI-3110 and KPCI-3116 User’s Manual
Synchronizing A/D and D/A subsystems
You can synchronize the operation of the A/D and D/A subsystems providing that they are not
performing single value operations. Refer to
page 2-7 and page 2-19 for more information on
single value operations.
You can synchronize the A/D and D/A subsystems in two ways: by applying the same external
trigger or by applying the same external clock. This section describes these two methods.
Synchronizing the triggers
You can synchronize the triggers of the A/D and D/A subsystems as follows:
•
External digital (TTL) trigger — Using software, specify the trigger source for the A/D
and D/A subsystems as the external digital (TTL) trigger and specify start type as digital trig-
ger. Then, wire an external digital TTL trigger to both the A/D subsystem and the D/A sub-
system. When armed, both subsystems are triggered simultaneously when the external
digital event occurs.
Synchronizing the clocks
You can synchronize the clocks of the A/D and D/A subsystems as follows:
• External Sample Clocks — Using software, specify the clock source as the external A/D
sample clock for the A/D subsystem and as the external D/A output clock for the D/A sub-
system. When started, both subsystems are clocked simultaneously.