User Manual

USB PT-104 Data Logger Programmer's Guide 7

2.6

UsbPt104GetValue

PICO_STATUS UsbPt104GetValue (

short handle,

USBPT104_CHANNELS channel,

long * value,

short filtered

)

Once you open the driver and define some channels, the driver begins to take

continuous readings from the PT-104. When you call this routine, it immediately sets

data to the most recent reading for the specified channel.

The scaling of measurements is as follows:

Range

Scaling

Temperature

value × 1/1000 °C

Voltage (0 to 2.5 V)

value × 10 nV

Voltage (0 to 115 mV)

value × 1 nV

Resistance

value × 1 m

Arguments:

handle, identifies the device from which to get data

channel, the number of the channel to read, from 1 to 4 in

differential mode or 1 to 8 in single-ended mode

value, output: an array where the sample values will be stored

filtered, if set to TRUE, the driver returns a low-pass filtered value

of the temperature. The time constant of the filter depends on the

value of filter_factor for this channel, and on how many channels

are active

Returns:

defined in picoStatus.h