simultaneous and synchronized operations -凯发k8网页登录

acquire and generate analog data simultaneously, synchronize acquisition and generation

use shared scan clocks and start triggers to synchronize operations within devices and between multiple devices.

functions

	add clock connection to device interface
	remove clock from device interface
	add trigger connection to device interface
	remove trigger from device interface

topics

synchronization considerations

synchronize operations with shared start triggers and shared scan clocks.
simultaneously start all devices in the dataacquisition.
synchronize operations on all connected devices in the dataacquisition.

external clocks, shared clocks, and shared start triggers

use a falling edge digital trigger to initiate analog data acquisition.
share the clock of the analog subsystem on your device for the digital acquisition.
acquire digital data using an external clock
acquire digital data in the foreground using an external scan clock.
acquire digital data using a counter output channel to generate clock pulses.
synchronize multiple devices in a dataacquisition using a shared clock and trigger.
synchronize digital signal analyzer product family devices for accurate audio frequency measurements.

compactdaq synchronization

acquire and generate data at the same time.
use compactdaq chassis pfi terminal with external clock.
use the external trigger and clock functionality on a compactdaq chassis without pfi terminals.
synchronize multiple compactdaq chassis.

featured examples

synchronize ni pci devices using rtsi

acquire synchronized data from two pci devices. a sine wave is connected to channel 0 of ni pci-6251 and to channel 0 of ni pcie-6363. synchronized operation is verified by demonstrating zero phase lag between the acquired signals.

start a multi-trigger acquisition on an external event

set up and start a multi-trigger acquisition on an external event. in this instance, the device is configured to start acquiring data on a rising edge signal.

acquire data from two devices at different rates

acquire data from two different daq devices running at different sampling rates. the example uses two national instruments compactdaq analog input modules (9201 and 9211) that have different acquisition rate limits. the 9211 module is used for temperature measurements and acquires at a slower rate (10 hz) than the 9201 module, which is used to measure voltage (100 hz). since all channels in a data acquisition object must acquire at the same rate, to acquire from two modules at multiple rates you need to use two data acquisition objects. to make both daq devices start simultaneously, you can use a hardware digital triggering configuration.