USB Data Acquisition (DAQ) Module, with 8 digital inputs with voltage range of 3V to 32V and 8 digital output lines capable of switching up to 30V at 400 mA. Includes channel to channel isolation of up to 500 V,a 32-bit counter/timer,screew terminals. USB Low Cost Digital I/O Module with 8 isolated digital input lines with an input voltage range of ±3 V to ±32 V and 8 isolated digital output lines capable of switching up to ±30 V at 400 mA. Includes one 32-bit counter/timer.
Counter/Timer Subsystem
The counter/timer subsystem on these modules can be run by an internal or external clock source.
- Internal clock – Through software the user can specify the frequency at which to pace the counter/timer operation. This frequency can range from 4 Hz to 2.5 kHz.
- External clock – The user connects an external clock source with a maximum frequency of 6 MHz and then uses a clock divider to specify the actual frequency to pace the counter/timer operation. This is useful when the user wants to pace counter/timer operations at rates not available with the internal clock or if uneven intervals are required.
The subsystem supports four separate operating modes:
- Event counting – This mode is used to count the number of falling edges that occur. The user can count up to 4,294,967,296 events before the counter rolls over to 0 and starts counting again.
- Frequency measurement – This mode allows the user to determine the frequency of the clock input.
- Edge-to-edge measurement – This mode allows the user to measure the time interval between a specified start edge and a specified stop edge. The user can measure the pulse width, the period, and the frequency of the signal.
- Rate generation – This mode allows users to generate square waves with an output frequency from 4 Hz to 2.5 kHz
