WinSystems PCM-AIO, Руководство по эксплуатации, Страница: 20 / 43

2.17
D/A CALIBRATION PROCEDURE
The D/A sec tion of the PCM- AIO can be eas ily cali brated by the use of a digi tal volt me -
ter. To cali brate the D/A chan nels use the fol low ing pro ce dure:
1. In stall the board in the sys tem and turn on the sys tem to sta bi lize for at least 5 min utes.
2. Check the volt age ref er ence out put on J6 pin 1 for 5.000V. Ad just trim pot R13 if nec es sary.
3. Se lect the volt age ref er ence out put for each chan nel by the use of J6. See sec tion 2.15.
4. For a uni po lar out put, out put an 0FFF HEX to the chan nel or chan nels that are be ing cali brated
and ad just the gain ad just ment po ten ti ome ters for FS- 1LSB as shown in the ta bles be low.
5 .For a bi po lar out put, out put an 0800 HEX to the chan nel or chan nels that are be ing cali brated and
ad just the gain ad just ment po ten ti ome ters for 0000 as shown in the ta bles be low.
VOLT AGE OUT PUT FOR UNI PO LAR AND BI PO LAR RANGES
SCALE 0 to +5V -5V to +5V
+FS-1 LSB 4.9988 4.9976
+1/2 FS 2.5000 0.0000
GAIN AD JUST MENT PO TEN TI OME TERS VER SUS CHAN NELS
CHAN NEL POT
0 R1
1 R18
Page 2-12 OPERATIONS MANUAL PCM-AIO 980723
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