National Instruments NI 9144 NI 9229/9239

NI 9144 User Guide and Specifications 58 ni.com

NI 9237 Calibration Data

The NI 9237 has four channels. Each channel has an associated LSB

weight, which is the number of volts per bit, and an offset, which is the

number of volts per bit measured when the inputs are grounded.

Note LSB weight is referred to as Gain in the object dictionary.

The calibration data is stored in a U16 array, though each Offset field

(subindex 1, 3, 5, and so on) should be interpreted as a signed value.

Use the calibration coefficients with the following equation to generate

corrected data:

NI 9229/9239

Table 53. NI 9237 Scan List Format

Coefficient Representation Units

LSB Weight Unsigned pV/LSB

Offset Signed nV

Table 54. NI 9229/9239 Vendor Configuration Extensions

Index Sub Type R/W Description

0x2002 0 U32 R/W Configure ADC,

default = 0x06

0x2100 0 ARR:U32 Calibration = 16

1 R Ch0 Offset

2 R Ch0 Gain

3 R Ch1 Offset

... ...

8 R Ch3 Gain

9 R External Ch0

Offset

... ...

Vcorrected Vraw

()Vraw bits()

∗LSBweight

pV

bits

---------

⎝⎠

⎛⎞

∗10 13–V

pV

-------

⎝⎠

⎛⎞

⎩⎭

⎨⎬

⎧⎫

Offset pV()

∗10 8–V

nV

-------

⎝⎠

⎛⎞

⎭

⎬

⎫

–=

Contents

Main USER GUIDE AND SPECIFICATIONS NI 9144 Deterministic Ethernet Expansion Chassis for C Series Modules Contents Introduction Safety Guidelines Safety Guidelines for Hazardous Locations Special Conditions for Hazardous Locations Use in Europe Special Conditions for Marine Applications Mounting the NI 9144 Chassis Figure 2. NI 9144 Chassis, Bottom View with Dimensions Figure 3. NI 9144 Chassis, Front View with Dimensions Mounting the NI 9144 Chassis on a Panel National Instruments Corporation 7 NI 9144 User Guide and Specifications Figure 5. Installing the Panel Mount Accessory on the NI 9144 Chassis Figure 6. Dimensions of NI 9144 Chassis with Panel Mount Accessory Installed Caution Remove any C Series I/O modules from the chassis before removing it from the panel. Mounting the Chassis on a DIN Rail Connecting the NI 9144 Chassis to a Network Understanding LED Indications POWER LED FPGA LEDOpen FPGA Mode Only RUN and ERR LEDs INIT PRE-OP SAFE-OP Resetting the NI 9144 Network Configuration Safe-State Outputs Slave Timing Modes Updating your Firmware Using the NI 9144 with an EtherCAT Third-Party Master Using AoE/SDO Using CoE/SDO Specifications Network Power Requirements Physical Characteristics Safety Voltages Hazardous Locations Environmental Shock and Vibration Cabling Safety Standards Electromagnetic Compatibility CE Compliance Online Product Certification RoHS Appendix A Vendor Extensions to the Object Dictionary Supported C Series Modules C Series Modules with No Configurable Options NI 9201/9221 NI 9201/9221 Scan List NI 9201/9221 Calibration Data NI 9203 NI 9203 Scan List Page NI 9203 Calibration Data Page NI 9205/9206 NI 9205/9206 Scan List Page NI 9205/9206 Calibration Data NI 9211 NI 9211 Scan List NI 9211 Calibration Data NI 9213 NI 9213 Conversion Speed Control NI 9213 Common Mode Error/Status NI 9213 Scan List NI 9213 Calibration Data NI 9215 NI 9215 Calibration Data NI 9217 NI 9217 Conversion Speed Control NI 9217 Scan List NI 9217 Calibration Data NI 9219 NI 9219 ADC Format NI 9219 Error Status NI 9219 Calibration Data Page NI 9219 Configuration Commands Page Page Page Page Page Page NI 9233 NI 9233 Configure ADC Page NI 9233 Calibration Data NI 9234 NI 9234 Configure Module Page NI 9234 Example Data Rates NI 9234 Calibration Data NI 9237 NI 9237 Configure Module Page NI 9237 Example Data Rates NI 9237 Calibration Data NI 9229/9239 NI 9229/9239 Calibration Data NI 9263 NI 9263 Calibration Data NI 9264 NI 9264 Calibration Data NI 9265 NI 9265 Error Status NI 9265 Calibration Data NI 9401 NI 9401 Direction Control NI 9403 NI 9403 Direction Control NI 9476 NI 9476 Error Status Where to Go for Support