Gx3748DigitizerReadTriggerTimestamp

Purpose

Reads the trigger time stamp from the acquired group’s data.

Syntax

Gx3748DigitizerReadTriggerTimestamp (nHandle, nDigitizerGroup, pdTriggerTimestamp, pnStatus)

Parameters

Comments

The function reads the trigger time stamp from the acquired group’s data. The digitizer needs to be in Halt state before calling this function.

The Gx3748 has 3 input groups (0-2) each with 16 channels (48 total input channels). The digitizer has 3 independent inputs, all 3 has the same programmable sample period. Sample period can be set by calling Gx3748DigitizerSetSamplesPeriod() API. Each of the 3 digitizer inputs can record up 87,300 samples, the number of samples to acquired are set by calling Gx3748DigitizerSetSamplesCount() API. Each of the digitizer inputs can have a programmable trigger mode, trigger mode can be set by calling the Gx3748DigitizerSetTriggerMode() API. The user can set programmatically the trigger threshold for each of the digitizer inputs by calling the Gx3748DigitizerSetTriggerThreshold() API. Acquisition progress and total number of samples acquired of each of the digitizers inputs can monitor at any time by calling the Gx3748DigitizerGetSamplesCounter() API. Each of the digitizer inputs can armed or disarmed by calling the Gx3748DigitizerArm() API.

The user can halt the acquisition at any time by calling the Gx3748DigitizerHalt() API.

Once acquisition is done, to verify use Gx3748DigitizerGetGroupStatus() and  Gx3748DigitizerGetStatus() APIs, the user can read back the acquired data by calling Gx3748DigitizerReadWaveform() API. The acquired data also record the time when the trigger was detected, user can get the time stamp by calling the Gx3748DigitizerReadTriggerTimestamp() API.

Each of the digitizer inputs has a dedicated group of input channels:

• Digitizer Group 0: user can select programmatically the source to be one of Group 0 channels 0-15 by calling Gx3748DigitizerSetSource() API.

• Digitizer Group 1: user can select programmatically the source to be one of Group 1 channels 0-15 by calling Gx3748DigitizerSetSource() API.

• Digitizer Group 2: user can select programmatically the source to be one of Group 2 channels 0-15 by calling Gx3748DigitizerSetSource() API.

Example

The following reads group 0 trigger time stamp from the acquired group’s data state (see Gx3748DigitizerReadWaveform() API for complete example code):

SHORT nHandle, nStatus;

DOUBLE dTriggerTimestamp;

Gx3748DigitizerReadTriggerTimestamp (nHandle, GX3748_DIGITIZER_GROUP0, &dTriggerTimestamp, &nStatus);

See Also

Gx3748DigitizerArm, Gx3748DigitizerGetGroupStatus, Gx3748DigitizerGetStatus, Gx3748DigitizerHalt, Gx3748DigitizerReadSampleCount, Gx3748DigitizerReadWaveform, Gx3748DigitizerReset, Gx3748DigitizerSetSamplesCount, Gx3748DigitizerSetSamplesPeriod, Gx3748DigitizerSetSource, Gx3748DigitizerSetTriggerMode, Gx3748DigitizerSetTriggerThreshold, Gx3748DigitizerSoftwareTrigger, GxFpgaGetErrorString