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參數資料
| 型號： | PCDAC12-4 |
| 英文描述： | PC(ISA)BUS I/O CARD |
| 中文描述： | 電腦（ISA）總線的I / O卡 |
| 文件頁數： | 10/16頁 |
| 文件大小： | 266K |
| 代理商： | PCDAC12-4 |
2192-09063-000-000
J260 PCDAC 12-4
Page 10
Calibration
PCDAC12-4 is accurately calibrated before leaving the factory, however re-calibration will be
required from time to time. There are six trimmers on the board which are intended for fine
adjustments only.
To calibrate the board, the test program, e.g. PCDAC124.bas or demda124.C., should be used
and measurements made with a 5digit DVM (or better).
VR5, VR6 Reference Trim
Set one of LK1 to LK4 to the desired range.
Monitor the voltage at the link ref. analogue 0V.
Adjust the corresponding trimmer to give exactly 5V or 10V
VR1, VR2, VR3, VR4 Channel Trim
These trimmers adjust individual channels, VR1 for DAC0, VR2 for DAC1 etc. The effect at the
output is to adjust full-scale on a uni-polar channel, and to adjust the zero point for a bi-polar
channel.
Uni-Polar Channel
Set the jumpers for the required uni-polar range.
Monitor the output voltage ref. analogue 0V.
Use the program to set the DAC to half-scale (0800h)
Adjust the corresponding trimmer to give 2.50V (5V range) or 5.00V (10V range).
Bi-Polar Channel
Set the jumpers for the required bi-polar range.
Monitor the output voltage ref. analogue 0V.
Use the program to set the DAC to half-scale (0800h)
Adjust the corresponding trimmer to give 0.00V.
VR5
VR6
10V reference adjust
5V reference adjust
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