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Chapter 14 SCXI Hardware
DAQ Hardware Overview Guide 14-14 www.ni.com
the DAQ device, from an external source connected to a pin on the front
connector of the module, or from a trigger line on the SCXIbus.
The SCXI-1140 track/hold setup is software-configurable for
single-channel operations or for interval-scanning operations. During
single-channel operations, an
SCXI function call can put the module into
hold mode before
AI functions acquire the data, and put the module back
into track mode to sense new input values. During interval-scanning
operations, the scan interval timer causes the module to go into hold mode
at the beginning of each scan and go back into track mode at the end of each
scan. Effectively, the input channels of the SCXI-1140 are simultaneously
sampled at the beginning of each scan. The scan interval timer can either be
a counter on the DAQ device or an external source connected to the front
connector of the module.
In addition, you can synchronize multiple SCXI-1140 modules by using the
SCXIbus so that all SCXI-1140 modules will go into hold mode at the same
time. If you are scanning multiple SCXI-1140 modules in multiplexed
mode along with other types of SCXI modules, the module that is cabled to
the DAQ device must be an SCXI-1140 module for the track/hold control
signals to be properly routed and synchronized.
It is important to be aware of the track/hold timing requirements of the
SCXI-1140. For accurate data, the module must be in track mode for at
least 7 µs before going into hold mode. During an interval-scanning
operation, this means that the scan interval should be at least 7 µs longer
than the total sample interval. After the module is in hold mode, the latched
data at the input channels will droop at a rate of 10 mV/s, so you must be
careful to sample all the desired channels relatively quickly after putting the
module into hold mode.
SCXI-1141, SCXI-1142, and SCXI-1143
The SCXI-1141, SCXI-1142, and SCXI-1143 are 8-channel analog input
modules with programmable gains and filters. The SCXI-1141,
SCXI-1142, and SCXI-1143 modules have elliptic, Bessel, and
Butterworth filters respectively. The input range of the modules is −5 to
+5 V. Each channel has programmable gains of 1, 2, 5, 10, 20, 50, and 100;
use the
SCXI_Set_Gain function to program the gain on a per-channel
basis. The filters have a programmable cutoff frequency from 10 Hz to
25 kHz, and you can derive this frequency from an external clock. Use the
SCXI_Configure_Filter function to select the filter settings for the
module or to enable the filters on a per-channel basis. The SCXI-1141,
SCXI-1142, and SCXI-1143 support both multiplexed and parallel mode.
- 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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