![]() |
DataTaker modes and inputs
|
This window lets you set up and the DataTaker's ability
to return temperatures (instead of microvoltages) from thermocouples (note
that the default setting is for copper-constantan thermocouples).
It also allows selection of differential or single-ended inputs for voltage
measurements, or use of the high-speed counter:
In this example, there are 8 channels in use. Three channels (#1, #4, and #8) use copper-constantan thermocouples. The remaining channels read voltages; four are connected as single-ended inputs and one as a differential input.
You should use the 'high-accuracy' mode unless achieving the highest possible sampling speed is critical. • Note that LabHelper automatically switches 'high-speed' mode ON if you request a sample rate faster than 10 samples/second. This does NOT affect mains frequency filtering; you have to turn that on or off manually. The 'Mains frequency' buttons are for filters that reduce electrical noise from AC power supplies; depending on country (and sometimes region), the AC frequency is either 50 or 60 Hz. *This means that as you add channels, the sampling rate decreases: for example, with 2 channels, the maximum sampling speed is about 5 samples/second in 'high-accuracy' mode.
|