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Appendix E. Manual Calibration
E.1 A/D Calibration
Regular and proper calibration procedures ensure the maximum
possible accuracy. It is easy to complete the A/D calibration procedure
automatically (i.e. through software calibration) by executing the A/D
calibration program
AutoCali.EXE
. Therefore, it is not necessary to
adjust the hardware settings of the MIC-3716. However, the following
calibration steps are also provided for your reference in case manual
calibration is needed:
1. Adjust the on board reference voltage. First, adjust VR1 until the
reference voltage on TP4 has r5.0000 V. Next, to write
0x0080
,
0x0180
,
0x0280
and
0x0380
sequentially to the
Calibration Command and Data register
(BASE+18) set
MIC-3716 to AI software trigger and calibration mode.
2. Adjust the
PGA
offset voltage. First, write any value to BASE+9
to clear FIFO. Then set A/D channel to channel 0.
3. Write the
value
from
0x0200
to
0x02FF
sequentially to the
Calibration Command and Data register
(BASE+18), and get
each bipolar range’s data by the software trigger A/D method.
Repeat this procedure 1000 times then average those data for each
value
. After that, compare the average data of the range between
±5 V and ±0.625 V, to see whether the discrepancy is less then 2
LSB. If so, go to the next step. Otherwise, you must change the
value
and repeat the whole procedure in this step again until the
Summary of Contents for MIC-3716
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Page 8: ...viii Table E 2 D A binary code table 117...
Page 11: ...1 Introduction 1 CHAPTER...
Page 17: ...7 Fig 1 1 Installation Flow Chart...
Page 21: ...11 Installation and Configuration CHAPTER 2...
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Page 41: ...31 Signal Connections CHAPTER 3...
Page 44: ...34 Fig 3 1 I O connector pin assignments for the MIC 3716...
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Page 55: ...45 Software Programming Overview CHAPTER 4...
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Page 61: ...51 Calibration CHAPTER 5...
Page 77: ...67 Appendixes...
Page 81: ...71 Appendix B Block Diagrams...
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