DSCDACALPARAMS

Structure containing parameters used in D/A auto-calibration.

Structure Definition

public struct DSCDACALPARAMS
    {
        public int fixedstatus; /* INPUT/OUTPUT: reports the "fixed" status that was detected.  fixed=FALSE means programmable. */

        public int polarity;    /* INPUT/OUTPUT: Bipolar=FALSE, Unipolar=TRUE */

        public double darange;  /* INPUT:  D/A programmable value to calibrate */

        public float offset;    /* OUTPUT: Difference between target and measured vals. */

        public float gain;      /* OUTPUT: Difference between target and measured vals. */

        public float cal_point;         /* INPUT: D/A value to calibrate */

        // New for the Helios and later D/A-capable boards.
        public byte darange_calibrate;  /* The D/A range to calibrate. */

        public byte boot_darange;       /* The D/A range to boot up in. */

        [System.Runtime.InteropServices.MarshalAsAttribute(System.Runtime.InteropServices.UnmanagedType.ByValArray, SizeConst = 8, ArraySubType = System.Runtime.InteropServices.UnmanagedType.Struct)]
        public byte[] cycles;           // number of cycles the calibration took

        /*///////////////////////////
        // For DMMAT specific use: //
        ////////////////////////// */
        public int ch0pol, ch0prog, ch0ext;  /* cho0pol=true: bipolar, ch0prog=true: programmable, ch0ext=true: external; */

        public int ch1pol, ch1prog, ch1ext;

        public float reference;

    }

Structure Members

Name	Description	Applicable Boards
fixedstatus	Reports the "fixed" status that was detected. fixed=FALSE means programmable.	NA
polarity	Bipolar=FALSE, Unipolar=TRUE	NA
darange	Desired full-scale voltage for custom D/A range setting, in volts. Used only when in Programmable mode, otherwise ignored. Range is anywhere between 1.0 and 10.0 in increments of .001.	Diamond-MM-16RP-AT
offset	Error in D/A LSB counts at the mid-scale of the D/A range	Diamond-MM-16RP-AT
gain	Error in D/A LSB counts at the full-scale (high end) of the D/A range	Diamond-MM-16RP-AT
cal_point	Desired D/A point voltage for custom calibration setting, in volts. Range is anywhere in valid D/A range.	NA
darange_calibrate	The D/A range to calibrate	NA
boot_darange	The D/A range to boot up in	NA
cycles	number of cycles the calibration took	NA

The following parameters are used only on Diamond-MM-AT. This board has independent D/A settings for each analog output channel. The parameters below correspond to the jumper settings on the board.

Name	Description
ch0pol, ch1pol	Polarity setting for each D/A channel: 0 = bipolar, 1 = unipolar
ch0prog, ch1prog	Programmable setting for each D/A channel: 0 = fixed range, 1 = programmable range
ch0ext, ch1ext	ch0ext, ch1ext
reference	For internal use only.

The parameter darange_calibrate is used for Helios board only. This parameter is used to perform DA calibration verification on the mode being verified. The valid modes are specified in the DA table. The valid values for this parameter are

Value	Description
0	( 0 to 10V UNIPOLAR )
1	( 0 to 5V UNIPOLAR )
4	(+/- 2.5V BIPOLAR)
5	(+/- 5V BIPOLAR)
6	(+/- 10V BIPOLAR)