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VTB USER GUIDE

11.11 Functions for Analog Outputs on NGQ

Functions for NGQ Analog Outputs

Hardware NGQ

NG_DAC – Analog Outputs NGQ

This function allows to update the analog outputs of each channel equipped in the NGQ

This expansions have 2 digital to analog converter at 12 bit, with a range of +/-10V. Therefore a value of +2047

corresponds to 10V in output, a value of -2047 corresponds to -10V.

The selection of the channel is made by an index from 0 to 1.

WARNING: For enable the analog outputs on NGQ, is necessary set the following property

ENCODER ENABLE=true on NGQ INIT Object

Syntax

NG_DAC(Char Chan, Long Val)

Parameters

Chan Number of channel (from 0 to 1)

val Value of the output

Example

Used variables:

val LONG

channel CHAR

channel = 0

val = 1024

ng_dac(channel, val) ' write 1024 (~5V) to analog channel 0

ng_dac(1,512) ‘ write 512 (~2,5V ) to analog channel 1

NG_DAC_CAL - CALIBRATION OF THE ANALOG OUTPUT OFFSET NGQ

This function allows to calibrate the OFFSET of the analog outputs. Usually it can be occur that the analog output has a

little value of voltage (OFFSET) in the order of mV also if zero has been set. With ng_dac_cal we can null this voltage

setting a value opposite to the offset one. Remind that for each unit the output value will be about 4mV.

Syntax

NG_DAC_CAL(Char Ch,Long Offset)

Parameters

Chan Number of channel (from 0 to 1)

Offset OFFSET value

WARNING: THE OFFSET VALUE ISN'T SAVED AND IT MUST BE SET AT EACH TURN-ON.

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