Hardware Manual - RTD Embedded Technologies, Inc.

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Calibration is done with the module installed in your system. Power up the system and let the DM6425HR circuitry stabilize for 15 minutes before calibration. Required Equipment The following equipment is required for calibration: • Precision voltage source: –10 to +10 V • Digital voltmeter: 5 1/2 digits • Small screwdriver (for trimpot adjustment) Figure 33 shows the DM6425HR layout with the trimpots located along the top edge. TR10 TR6 TR1 TR3 TR2 TR4 TR5 TR8 TR9 TR13 TR14 TR7 TR11 TR12 Figure 33 DM6425HR Trimpots 114 DM6425HR dataModule BDM-610010034 Rev C
A/D Calibration Two procedures are used to calibrate the A/D converter for all input voltage ranges. The first procedure calibrates the converter for the bipolar ranges (±5, ±10 V), and the second procedure calibrates the unipolar range (0 to +10 V). Table 9 shows the ideal input voltage for each bit weight for the bipolar ranges, and Table 10 shows the ideal voltage for each bit weight for the unipolar ranges. Bipolar Calibration Bipolar Range Adjustment: –5 to +5 V Two adjustments are made to calibrate the A/D converter for the bipolar range of –5 to +5 V. One is the offset adjustment, and the other is the full scale, or gain, adjustment. Trimpot TR4 is used to make the offset adjustment, and trimpot TR5 is used for gain adjustment. Before making these adjustments, make sure that the board is programmed for a range of ±5 V. Use analog input channel 1 and set it for a gain of 1 while calibrating the board. Connect your precision voltage source to channel 1. Set the voltage source to –1.22070 mV, start a conversion, and read the resulting data. Adjust trimpot TR4 until the reading flickers between the values listed in the table below. Next, set the voltage to –4.99878 V, and repeat the procedure, this time adjusting TR5 until the data flickers between the values in the table below. Data Values for Calibrating Bipolar 10 V Range (–5 to +5 V) A/D Converted Data Offset (TR4) Input Voltage = –1.22 mV Converter Gain (TR5) Input Voltage = –4.99878 mV 0000 0000 0000 1000 0000 0000 1111 1111 1111 1000 0000 0001 Bipolar Range Adjustment: –10 to +10 V To adjust the bipolar 20 V range (–10 to +10 V), program the board for ± 10 V input range. Then, set the input voltage to +5.0000 V and adjust TR2 until the output matches the data in the table below. Data Values for Calibrating Bipolar 20 V Range (–10 to +10 V) TR2 Input Voltage = +5.0000 V A/D Converted Data 0100 0000 0000 BDM-610010034 Rev C Appendix B: Calibration 115
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DM6425HR 32-Channel, 500 kHz PC/104
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DM6425 32-Channel, 500 kHz PC/104 d
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Table of Contents Chapter 1 Introdu
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A/D Conversion Modes . . . . . . .
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D/A Calibration. . . . . . . . . .
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Chapter 1 Introduction The DM6425HR
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DM6425HR Ordering Information The D
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Features The DM6425HR is a 12-bit,
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Analog-to-Digital Conversion The DM
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8254 Timer/Counters Two 8254 progra
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For More Information This manual an
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Chapter 2 DM6425HR Module Settings
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JS1 JS2 JS3 JS4 Figure 6 DM6425HR S
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Base Address Jumper (Factory Settin
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Chapter 3 Installing the dataModule
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Installation Considerations Conside
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External I/O Connections Figure 13
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Connecting the Analog Input Pins Th
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I/O CONNECTOR (CN3) SIGNAL SOURCE 1
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Chapter 4 I/O Mapping This chapter
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BDM-610010034 Rev C Chapter 4: I/O
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Load Channel-Gain Table in Channel-
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This register sets up the trigger m
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BA + 0x0Ah (10): Digital Input FIFO
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BA + 0x18h (24): Digital I/O Port 0
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BA + 0x1Eh (30): Digital IRQ Status
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BA + 0x408h (1032): DAC3 Update Reg
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BA + 0x41Ch (1052): Read/Program Po
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BA + 0x800h/801h (2048/2049): Board
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Setting or clearing more than one b
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Chapter 5 A/D Conversions This chap
Page 73 and 74: Programming Channel, Gain, Input Ra
Page 75 and 76: Pause Bit Bit 11 is used as a pause
Page 77 and 78: With BA + 0x00h, bits 1 and 0 set t
Page 79 and 80: TO A/D CONVERTER A/D CONVERSION SEL
Page 81 and 82: Trigger Repeat Function Bit 13 in t
Page 83 and 84: Programmable Burst In this mode, a
Page 85 and 86: Voltage values for each bit will va
Page 87 and 88: Programming Steps The pacer clock i
Page 89 and 90: Using the Sample Counter to Create
Page 91 and 92: Mathematical formula for calculatin
Page 93 and 94: Chapter 6 Data Transfers Using DMA
Page 95 and 96: Allocating a DMA Buffer When using
Page 97 and 98: Setting the DMA Page Register Oddly
Page 99 and 100: Programming the DM6425HR for DMA On
Page 101 and 102: Chapter 7 Interrupts This chapter e
Page 103 and 104: CLOCK DIGITAL INPUT IRQ OUT Figure
Page 105 and 106: If you find yourself intimidated by
Page 107 and 108: Restoring the Startup IMR and Inter
Page 109 and 110: Chapter 8 D/A Conversions This chap
Page 111 and 112: Chapter 9 Timer/Counters This chapt
Page 113 and 114: Each timer/counter has two inputs,
Page 115 and 116: Chapter 10 Digital I/O This chapter
Page 117 and 118: When using event interrupts, you ca
Page 119 and 120: Appendix A Example Programs This ap
Page 121 and 122: Special Considerations When manipul
Page 123: Appendix B Calibration This appendi
Page 127 and 128: Below is a table listing the ideal
Page 129 and 130: Appendix C Specifications This appe
Page 131 and 132: Table 11 DM6425HR Specifications (c
Page 133 and 134: Appendix D I/O Connector Pin Assign
Page 135 and 136: Mating Connector Part Numbers Manuf
Page 137 and 138: Appendix E IDAN Dimensions and Pino
Page 139 and 140: IDAN-DM6425HR-62S External I/O Conn
Page 141 and 142: IDAN-DM6425HR-68S External I/O Conn
Page 143 and 144: Appendix F Limited Warranty RTD Emb
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Hardware Manual - RTD Embedded Technologies, Inc.

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