National Instruments SCXI-1321 - Manuals

National Instruments SCXI-1321 – Manual in PDF format online.

Manuals:

Manual

Manual National Instruments SCXI-1321

Summary

Page 2 - italic; monospace; What You Need to Get Started; To set up and use the SCXI-1321, you need the following items:

SCXI-1321 Terminal Block Installation Guide 2 ni.com italic Italic text denotes variables, emphasis, a cross reference, or an introduction to a key concept. This font also denotes text that is a placeholder for a word or value that you must supply. monospace Text in this font denotes text or charact...

Page 3 - Connecting the Signals; Note

© National Instruments Corporation 3 SCXI-1321 Terminal Block Installation Guide Connecting the Signals Note Refer to the Read Me First: Safety and Radio-Frequency Interference document before removing equipment covers, or connecting or disconnecting any signal wires. To connect the signal to the te...

Page 4 - SCXI-1321 Parts Locator Diagram

SCXI-1321 Terminal Block Installation Guide 4 ni.com Figure 1. SCXI-1321 Parts Locator Diagram 1 Strain-Relief Bar 2 Strain-Relief Screws 3 Safety-Ground Lug 4 Mating Connector 5 Thumbscrew 6 Top-Cover Screws 7 Top Cover Back View Front View 2 1 3 4 5 7 6

Page 5 - SCXI-1321 Circuit Parts Locator Diagram; Installing the Terminal Block; Make sure that the module top and bottom thumbscrews do

© National Instruments Corporation 5 SCXI-1321 Terminal Block Installation Guide Figure 2. SCXI-1321 Circuit Parts Locator Diagram Installing the Terminal Block To connect the terminal block to the SCXI module front connector, complete the following steps: 1. Connect the module front connector to it...

Page 6 - Specifications; Electrical; Accuracy; Nulling potentiometer; Mechanical; Resistor sockets; Maximum Working Voltage

SCXI-1321 Terminal Block Installation Guide 6 ni.com Note To minimize the temperature gradient inside the terminal block, move the SCXI chassis away from any extreme temperature differential. Specifications All specifications are typical at 25 °C unless otherwise specified. Electrical Cold-junction ...

Page 7 - Environmental; Electromagnetic Compatibility; FCC Part 15A above 1 GHz; CE Compliance

© National Instruments Corporation 7 SCXI-1321 Terminal Block Installation Guide Environmental Operating temperature............................ 0 to 50 °C Storage temperature ............................... –20 to 70 °C Humidity ................................................ 10 to 90% RH, noncond...

Page 8 - Declarations; at; Performed or Supported Signal Conditioning; Offset Nulling; Connect the bridge configuration to the selected channel.; Trimmer Potentiometers and Corresponding Channels; Channel Number

SCXI-1321 Terminal Block Installation Guide 8 ni.com Note Refer to the Declaration of Conformity (DoC) for this product for any additional regulatory compliance information. To obtain the DoC for this product, click Declarations of Conformity Information at ni.com/hardref.nsf/ . Performed or Support...

Page 9 - is either a completion resistor or a second strain-gauge nominal; is the nulling resistor value; Nulling Resistors and Corresponding Channels

© National Instruments Corporation 9 SCXI-1321 Terminal Block Installation Guide The factory default value of all the nulling resistors on the terminal block is 39 k Ω . Note These resistors are socketed for easy replacement. These sockets best fit a 1/4 W resistor lead size. To determine the nullin...

Page 10 - με; Quarter-Bridge Nulling Circuit; G F

SCXI-1321 Terminal Block Installation Guide 10 ni.com Assuming a strain-gauge range with a gauge factor of GF = 2 and a quarter-bridge configuration, this range corresponds to ±1,498 µε , as given by the strain formula for a quarter-bridge strain-gauge configuration: where Figure 3. Quarter-Bridge N...

Page 11 - Half-Bridge Nulling Circuit

© National Instruments Corporation 11 SCXI-1321 Terminal Block Installation Guide Figure 4. Half-Bridge Nulling Circuit CH+ CH+ CH– EX+ EX– + – + – R 1 R 2 4.5 k Ω 4.5 k Ω R SCAL 301 k Ω R Trim 10 k Ω R Null 39.1 k Ω (Screw Adjusts Potentiometer) R L R L R L R 4 (gauge) EX+ CH+ CH+ CH– EX+ EX– R Tri...

Page 12 - Full-Bridge Nulling Circuit; Shunt Calibration; parameter to; ob; where

SCXI-1321 Terminal Block Installation Guide 12 ni.com Figure 5. Full-Bridge Nulling Circuit Shunt Calibration Shunt calibration provides a method of adjusting for gain error to improve accuracy. The shunt-calibration circuitry configuration places a shunting resistor in parallel with the resistive e...

Page 13 - LabVIEW; Socket to Channel Relationship; Channel

© National Instruments Corporation 13 SCXI-1321 Terminal Block Installation Guide z is the module slot of the SCXI-1121 w is the channel of the module that you want to engage the shunt and take measurements For example, if you want to measure the voltage at channel 0 with the shunt resistor enabled,...

Page 14 - Cold-Junction Compensation

SCXI-1321 Terminal Block Installation Guide 14 ni.com gauge with a gauge factor of GF = 2, V exc = 3.3 V, and R = 120 Ω produces the following: V change = 0.3321 mV Replacing the strained voltage by V change in the quarter-bridge strain equation produces an equivalent 199 µε of change. Refer to the ...

Page 15 - RTD and Thermistor Excitation; Remove the nulling resistor from its sockets.; Jumper Settings of the Nulling Circuits; Jumper

© National Instruments Corporation 15 SCXI-1321 Terminal Block Installation Guide You can read a temperature at the beginning of the test and use that value with the data that follows. Using this method assumes that there are no temperature variations during the measurement period. If there are temp...

Page 16 - Jumper Settings of the Nulling Circuits (Continued)

3 2 19 2 4 C - 0 1 Jan 0 3 *321924C-01* W3 Nulling circuit of Channel 2 is enabled (factory default setting) Nulling circuit of Channel 2 is disabled W4 Nulling circuit of Channel 3 is enabled (factory default setting) Nulling circuit of Channel 3 is disabled Table 4. Jumper Settings of the Nulling ...