DAQ VXI-SC-1102 Manual de Instruções Página 86
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Chapter 14 SCXI Hardware
DAQ Hardware Overview Guide 14-12 www.ni.com
If you are measuring RTDs, you can configure the SCXI-1122 for four-wire
scanning mode, which means that the module will switch the current
excitation source to drive one of the channels 8 through 15 as an
excitation output channel whenever the corresponding input channel 0
through 7 is selected. In this mode the module has 8 analog input
channels and 8 corresponding current excitation channels. See the
SCXI_Set_Input_Mode function description in the NI-DAQ Function
Reference Online Help.
The SCXI-1122 uses relays to switch the input channels; these relays
require 10 ms to switch. As a result, you cannot use a sampling rate greater
than 100 Hz in a channel-scanning operation. In addition, the relays have a
finite lifetime. If you plan to take many samples from each channel and
average them to eliminate noise, you should use the single-channel or
software scanning applications described in the SCXI Application Tips
section in Chapter 3, Software Overview, of the NI-DAQ User Manual for
PC Compatibles. This means you should select one channel on the module,
acquire many samples from that channel, then select the next channel, and
so on. You should not use the channel-scanning method if you want to take
many samples from each channel and average them.
The SCXI-1122 has an onboard EEPROM that contains a set of
factory-calibration constants for the amplifier on the module. NI-DAQ
automatically reads these constants and uses them in the
SCXI_Scale
function to compensate for amplifier gain and offset errors when
scaling binary data to voltage. You can also perform your own module
calibration by taking readings and using the
SCXI_Cal_Constants
function to store your own calibration constants in the EEPROM.
The SCXI-1122 has two software-selectable calibration modes that you use
the
SCXI_Calibrate_Setup
function to select. You can ground the
module amplifier inputs so that you can read the amplifier offset. You can
also switch a shunt resistor across your bridge circuit to test your circuit
(refer to the SCXI-1122 User Manual for more information about the shunt
resistor).
SCXI-1126
The SCXI-1126 is an 8-channel frequency input module that supports input
range of 250 Hz, 500 Hz, 1 kHz, 2 kHz, 4 kHz, 8 kHz, 16 kHz, 32 kHz,
64 kHz, and 128 kHz. All conversions between voltages and frequencies
are handled by NI-DAQ, so when you use the
SCXI-Scale function,
frequency data is returned automatically. You can select one of four
programmable filter settings through the
SCXI_Configure_Filter
- DAQ Hardware Overview 1
- Important Information 3
- Chapter 14 7
- SCXI Hardware 7
- Glossary 10
- Contents 11
- About This Guide 12
- MIO and AI Device Terminology 15
- Table 1 16
- Related Documentation 17
- MIO and AI Devices 18
- Chapter 1 MIO and AI Devices 19
- E Series Data Acquisition 20
- Set_DAQ_Device_Info 22
- MIO Device Analog Output 24
- E Series Digital I/O 26
- E Series PFI Pins 27
- Lab and 1200 Devices 28
- AI_Trigger_Config.vi 31
- DAQ_StopTrigger_Config 31
- Table 2-2 32
- Lab and 1200 Devices Groups 33
- Figure 2-1 34
- 1200 Device Acquisition Rate 35
- 1200 Device Calibration 36
- LPM Devices 37
- DAQ_Config 38
- LPM Device Digital I/O 39
- LPM Device Counter/Timers 40
- 516 Devices and 41
- DAQCard-500/700 Devices 41
- DAQ_Config. If you do 43
- Counter/Timer Operation 44
- Figure 4-2 45
- AT-AO-6/10 Analog 46
- Output Devices 46
- AT-AO-6/10 Digital I/O 48
- 6703/6704 Devices 49
- PC-TIO-10 Timing I/O Device 50
- PC-TIO-10 Counter/Timers 54
- PC-TIO-10 Digital I/O 55
- DIO-96 Digital I/O Devices 56
- DIO-96 Groups 57
- DIO-24 (6503) 58
- AT-MIO-16DE-10, and 6025E 58
- DIO-32F and 6533 60
- Digital I/O Devices 60
- Digital_Buffer_Write.vi) 62
- AMUX-64T External 63
- Multiplexer Accessory 63
- Table 11-2 64
- AMUX-64T Channel Numbers 64
- SCAN_Setup or 65
- MIO_Config 67
- Accessories 68
- SC-2042-RTD Accessory 69
- SC-2043-SG Accessory 69
- SCC Series Modules 70
- SCC-CI20 Current Input Module 72
- SCC-LP Lowpass Filter Modules 73
- SCC Configuration 74
- SCXI Operating Modes 76
- Chapter 14 SCXI Hardware 77
- SCXI Data Acquisition Device 80
- SCXI-1200 80
- SCXI Analog Input Modules 81
- SCXI-1100 81
- SCXI-1101 82
- SCXI-1104/C 83
- SCXI-1112 83
- SCXI_Scale function to 84
- SCXI_Single_Chan_Setup 84
- SCXI-1125 85
- SCXI-1122 85
- SCXI-1126 86
- SCXI-1127 87
- SCXI-1140 87
- SCXI Analog Output Module 89
- SCXI-1124 89
- SCXI Digital Modules 90
- SCXI-1160 and SCXI-1161 90
- SCXI-1162 and SCXI-1162HV 91
- SCXI-1163 and SCXI-1163R 91
- SCXI-1530, SCXI-1531 92
- SCXI-1540 92
- SCXI_Track_Hold_Setup 94
- DIO-24 and the DIO-96 96
- DIO-32F and 6533 Device 97
- VXI-DAQ Devices 99
- AO_Change_Parameter or the 100
- Multifunction VXIbus Devices 101
- VXI-DAQ Signal Conditioning 102
- VXI-SC-1102 Submodule 103
- VXI-SC-1150 Submodule 103
- PXI DAQ Devices 104
- PXI DAQ Signal Conditioning 105
- NI 5411 Devices 106
- Chapter 17 NI 5411 Devices 107
- DDS Mode 108
- Table 17-2 110
- NI 5411 Operational Modes 110
- Device Analog Input 112
- Data Acquisition 113
- Acquisition Timing 114
- Current Source 115
- Digital I/O 115
- Device Input 116
- Chapter 19 NI 40XX Devices 118
- DSA Devices 119
- and NI 455 120
- Analog Input Channels 120
- Data Acquisition Timing 121
- Channels 122
- Digital I/O 123
- Counter/Timer Operation 124
- Devices 125
- Chapter 21 671X Devices 126
- Technical Support Resources 129
- Worldwide Support 130
- Numbers/Symbols 131
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