

==================================
===== Calibration Procedure ======
==================================
Equipment:
        RadiSys EMC or EPC system including CPU, video adapter, monitor,
        keyboard and disk drive

        Non-metalic slotted calibration tool

        Male DB-25 connector with reference voltage connections (See Chapter
        3, Selecting Output Ranges, page ??) or other reference input.

        Digital Volt Meter (DVM) and Digital Current Meter (DCM) 
        accurate to 5 digits

        Voltage source capable of sourcing up to 10ma at 8V or greater.

        MS-DOS and DOS DEBUG utility.

Procedure:
        Note: This procedure is written assuming that the internal reference
        generators will be used (either -5V or -10V).  If an external
        reference is to be used, the calibration voltages will need to be
        calculated using:

                Vref0 = External Reverence Voltage for DAC #0
                Vref1 = External Reverence Voltage for DAC #1
                1LSB = -Vref/4096

     1. Install the EXM-21 into the RadiSys computer system and configure
        the BIOS setup screen. (See Section 2) (All DEBUG programming 
        examples will asume the EXM-21 base address is at 248h.)

        Install the Male DB-25 connector.

     2. Power up the RadiSys computer sytem and run DEBUG.

     3. Program DAC #0 and DAC #1 to 4095. In debug, type:
                -o 248 ff
                -o 249 ff
                -o 25a ff
                -o 25b ff

     4. Connect the DVM (+) lead to the DB-25 at pin 24.
        Connect the DVM (-) lead to the DB-25 at pin 2.

     5. Adjust FSAJ0 on the EXM-21 front pannel until the DVM reads
        -Vref0 - 1LSB (4.99878 for -5Vref, 9.99756 for -10Vref).
     
     6. Connect the DVM (+) lead to the DB-25 at pin 18.
        Connect the DVM (-) lead to the DB-25 at pin 2.

     7. Adjust FSAJ1 on the EXM-21 front pannel until the DVM reads
        -Vref1 - 1LSB (4.99878 for -5Vref, 9.99756 for -10Vref).

     8. Program DAC #0 and DAC #1 to 0. In debug, type:
                -o 248 0
                -o 249 0
                -o 25a 0
                -o 25b 0

     9. Connect the DCM (+) lead to the Voltage source output.
        Connect the DCM (-) lead to the DB-25 at pin 25.
        Connect the Voltage source ground to the DB-25 at pin 2.

    10. Adjust CLAJ0 on the EXM-21 front pannel until the DVM reads
        4.000 ma.
     
    11. Connect the DCM (+) lead to the Voltage source output.
        Connect the DCM (-) lead to the DB-25 at pin 19.
        Connect the Voltage source ground to the DB-25 at pin 2.

    12. Adjust CLAJ1 on the EXM-21 front pannel until the DVM reads
        4.000 ma.

    13. The EXM-21 is now calibrated.  Turn off the power to the RadiSys
        computer system and remove the EXM-21.

