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Contents

© National Instruments Corporation vii SCXI-1122 User Manual

Figures

Figure 1-1. The Relationship between the Programming Environment, NI-DAQ, and

Your Hardware...................................................................................................

Figure 2-1. SCXI-1122 Parts Locator Diagram ....................................................................

Figure 3-1. SCXI-1122 Front Connector Pin Assignments ..................................................

Figure 3-2. Ground-Referenced Signal Connection with High Common-Mode Voltage ....

Figure 3-3. Floating Signal Connection Referenced to Chassis Ground for Better SNR.....

Figure 3-4. Floating AC-Coupled Signal Connection Referenced

to Chassis Ground for Better SNR .....................................................................

Figure 3-5. AC-Coupled Signal Connection with High Common-Mode Voltage ...............

Figure 3-6. Avoiding Relay Wear by Sampling and Averaging Rather Than

Single-Sample Channel Scanning ......................................................................

Figure 3-7. Connecting a Quarter-Bridge Strain Gauge to Channel 0..................................

Figure 3-8. SCXI-1122 Rear Signal Connector Pin Assignments ........................................

Figure 4-1. SCXI-1122 Block Diagram................................................................................

Figure 4-2. Series Connection with Current Excitation........................................................

Figure 4-3. Four-Wire Scan Connection with Multiplexed Current Excitation ...................

Tables

Table 2-1. Digital Signal Connection Jumper Settings .......................................................

Table 2-2. Jumper W1 Settings ...........................................................................................

Table 2-3. User-Defined Current Receiver Resistors ..........................................................

Table 3-1. Maximum Load per Excitation Channel ............................................................

Table 3-2. SCXIbus to SCXI-1122 Rear Signal Connector to DAQ Board Pin

Equivalences ......................................................................................................

Table 4-1. Sense/Current Output Channel Associations .....................................................

Table 4-2. Pros and Cons of Two-Wire and Four-Wire Connections

with Current Excited Transducers......................................................................

Table 5-1. Maximum Allowable Error Ranges ...................................................................