- Omega 8 Channel Thermocouple USB Data Acquisition Module User's Guide

Technical reference

Example

The following code is a fragment of a C application demonstrating how to use

Streaming mode with the USB TC-08 driver:

//==================================================

// Setting up and running the unit in Streaming mode

//==================================================

usb_tc08_set_mains(handle, 0); // use 50Hz mains noise rejection

for (channel = 0; channel < 9; channel++)

{

// set each channel up as a type K thermocouple

// channel 0 is the cold junction and will be enabled

// by setting the third argument to anything other than ' '

usb_tc08_set_channel(handle, channel, 'K');

}

// find out how fast the unit can sample in its current setup state

minimum_interval = usb_tc08_get_minimum_interval_ms(handle);

usb_tc08_run(handle, minimum_interval); // sample as fast as possible

// not required (just illustrates that the application

// can be idle while the driver collects the readings)

Sleep(10000);

// use a two dimensional array with an array of readings for each

channel

// In a real application, this would be a nested loop to regularly poll

// the unit for readings

for (channel = 0; channel < 9; channel++)

{

no_of_readings = usb_tc08_get_temp( handle,

&reading_buffer[channel],

&times_buffer[channel],

buffer_length,

&overflows[channel],

channel,

0, // degrees Celsius units

0); // do not fill missing readings

}

// finished polling, now do something with the readings

// if overflows[channel] is high, then one of the readings

// in reading_buffer[channel] has exceeded the input range

// of the USB TC-08

// only stop the unit when we've completely finished streaming

usb_tc08_stop(handle);

Note: You should close down all other applications while you are performing any

timing-critical data logging tasks. Check that the Windows scheduler does not have

any activities planned during the logging session.