User manual

USB DrDAQ Programmer's Guide 17

3.5.8

UsbDrDaqSetInterval

PICO_STATUS UsbDrDaqSetInterval(

short handle,

unsigned long * us_for_block,

unsigned long ideal_no_of_samples,

short * channels,

short no_of_channels

)

This function sets the sampling rate of the unit.

The fastest possible sampling interval is 1 microsecond, when the number of samples

is 8129 divided by the number of channels active and the capture mode is BM

_SINGLE. Under all other conditions, the fastest possible sampling interval is 10

microseconds.

Arguments:

handle: handle returned from UsbDrDaqOpenUnit or

UsbDrDaqOpenUnitProgress

us_for_block: target total time in which to collect

ideal_no_of_samples, in microseconds

ideal_no_of_samples: the number of samples that you want to

collect. This number is used only for timing calculations.

channels: descriptions identifying the the channels from which you

wish to capture data. USB_DRDAQ_CHANNEL_EXT1,

USB_DRDAQ_CHANNEL_EXT2, USB_DRDAQ_CHANNEL_EXT3,

USB_DRDAQ_CHANNEL_SCOPE, USB_DRDAQ_CHANNEL_PH,

USB_DRDAQ_CHANNEL_RES, USB_DRDAQ_CHANNEL_LIGHT,

USB_DRDAQ_CHANNEL_TEMP, USB_DRDAQ_CHANNEL_MIC_WAVE,

USB_DRDAQ_CHANNEL_MIC_LEVEL.

no_of_channels: the number of channels in the channels array

Returns:

PICO_OK

PICO_INVALID_HANDLE

PICO_INVALID_CHANNEL

PICO_INVALID_TIMEBASE

PICO_NOT_RESPONDING

PICO_CONFIG_FAIL

PICO_INVALID_PARAMETER

PICO_NOT_RESPONDING

PICO_TRIGGER_ERROR