National Instruments RM-4339 Handbuch

CALIBRATION PROCEDURE

RM-4339

Rack-Mount Accessory Universal Bridge

This document contains the verification procedures for the National Instruments RM-4339. For

more information about calibration solutions, visit ni.com/calibration.

Contents

Software.................................................................................................................................... 1

Documentation.......................................................................................................................... 2

Test Equipment......................................................................................................................... 3

Connecting the Calibrator to the RM-4339 ...................................................................... 4

Test Conditions......................................................................................................................... 4

Initial Setup............................................................................................................................... 5

Verification ............................................................................................................................... 5

SCA Shunt Calibration Resistance Accuracy Verification .............................................. 5

Offset Voltage Verification .............................................................................................. 7

Quarter-Bridge Shunt Calibration Accuracy Verification................................................ 9

Specifications............................................................................................................................ 12

World Wide Support and Services ........................................................................................... 13

Software

Calibrating the NI RM-4339 requires the installation of NI-DAQmx on the calibration system.

Driver support for the RM-4339 was first available in NI-DAQmx 14.5. For the list of devices

supported by a specific release, refer to the NI-DAQmx Readme, available on the

version-specific download page or installation media.

You can download NI-DAQmx from ni.com/downloads. NI-DAQmx supports numerous

programming languages, including LabVIEW, LabWindows™/CVI™, C/C++, C#, and Visual

Basic .NET. When you install NI-DAQmx, you only need to install support for the application

software that you intend to use.

ni.com/manuals

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2|ni.com |RM-4339 Calibration Procedure

Documentation

Consult the following documents for information about the RM-4339, NI-DAQmx, and your

application software. All documents are available on ni.com and help files install with the

software.

NI PXIe-4339 and RM-4339 User Guide and Terminal Block Specifications

NI-DAQmx installation, hardware setup, and RM-4339 specifications.

NI PXIe-4339 and TB-4339/B/C Installation Guide and Terminal Block

Specifications

NI-DAQmx installation and hardware setup.

NIPXIe-4339 User Manual

NI PXIe-4339 specific information.

NI PXIe-4339 Specifications

NI PXIe-4339 specifications and calibration interval.

NI-DAQmx Readme

Operating system and application software support in NI-DAQmx.

NI DAQmx Help

Information about creating applications that use the NI-DAQmx driver.

LabVIEW Help

LabVIEW programming concepts and reference information about NI-DAQmx

VIs and functions.

NI-DAQmx C Reference Help

Reference information for NI-DAQmx C functions and NI-DAQmx C properties.

NI-DAQmx .NET Help Support for Visual Studio

Reference information for NI-DAQmx .NET methods and NI-DAQmx .NET

properties, key concepts, and a C enum to .NET enum mapping table.

RM-4339 Calibration Procedure |© National Instruments |3

Test Equipment

Table 1 lists the equipment recommended for the performance verification procedures. If the

recommended equipment is not available, select a substitute using the requirements listed in

Table 1.

Table 1. Recommended Equipment

Equipment

Recommended

Model Requirements

Calibrator Fluke 5520A If this instrument is unavailable, use a

calibrator that can provide resistance

values in the range of 120 to 1 kwith

0.01 resolution, and an accuracy of

90 ppm or better, and can sink 15 mA on

the 120 setting, 8 mA on the 350 

setting, and 3 mA on the 1 ksetting.

Ohm Meter NI PXI-4070 If this instrument is unavailable, use a

6 ½ digit DMM with 2-wire resistance

measurement capability and resistance

accuracy of 80 ppm or better of reading

+6 ppm of range for the 100 krange.

8-Channel

Universal-Bridge Input

Module

NI PXIe-4339 —

Terminal Block

Connection Accessory

TB-4339/B/C —

PXI Express Chassis NI PXIe-1062Q —

Accessory Cable SH96-96-2 The SH96-96-2 is available in 1 meter,

3 meter and 5 meter lengths. Any of these

cable lengths can be used.

RJ50 to Pigtail Cable (8) NI P/N: 195950-02 An RJ50 cable with a cable wire

resistance < 0.2 with better than 10%

resistance mismatch between individual

wires.

4|ni.com |RM-4339 Calibration Procedure

Connecting the Calibrator to the RM-4339

Caution Always have the NI PXI Express chassis powered off when inserting a

module into the chassis.

Refer to the specific verification procedure section for information describing the required

connections.

Note To minimize the number of verification connection changes, the connections

for SCA shunt calibration resistance verification and quarter-bridge shunt calibration

verification can be made simultaneously.

The RM-4339 provides support for up to three NI PXIe-4339 modules. The 96-pin DIN

connectors used to connect the NI PXIe-4339 to the RM-4339 through the SH96-96-2 cable are

located on the rear of the RM-4339 and are labeled A, B, and C. To fully verify the RM-4339,

each of the verification procedures in this document must be conducted for each position A, B,

and C. Refer to the NI PXIe-4339 and RM-4339 User Guide and Terminal Block Specifications

for information about how to install and use the RM-4339.

Test Conditions

The following setup and environmental conditions are required to ensure the RM-4339 meets

published specifications.

• Keep connections to the RM-4339 as short as possible. Long cables and wires act as

antennas, picking up extra noise that can affect measurements.

• Verify that all connections are secure.

• Shielded and twisted pair copper wire is recommended for all cable connections to help

prevent external noise sources from coupling into the measurements.

• Maintain an ambient temperature of 23 °C ± 5 °C. The offset voltage verification procedure

requires less than 1 °C of ambient temperature variation over the duration of the test. Refer

to Offset Voltage Verification procedure for more details.

• Keep relative humidity below 80%.

• Allow a warm-up time for each of the instruments used in this procedure according to the

specific instruments operating instructions.

• Ensure that the PXI Express chassis fan speed is set to HIGH, that the fan filters are clean,

and that the empty slots contain filler panels. For more information, refer to the Maintain

Forced-Air Cooling Note to Users document available at ni.com/manuals.

RM-4339 Calibration Procedure |© National Instruments |5

Initial Setup

Refer to the NI PXIe-4339 and RM-4339 User Guide and Terminal Block Specifications for

information about how to install the software and hardware, and how to configure the device in

Measurement & Automation Explorer (MAX).

Note When a device is configured with MAX, it is assigned a device identifier.

Each function call uses this identifier to determine which DAQ device to verify,

or verify and adjust. In this document, Dev1 was used for inputs that required a

device identifier.

Verification

The following performance verification procedures describe the sequence of operation and

provides test points required to verify the RM-4339. The verification procedures assume that

adequate traceable uncertainties are available for the calibration references.

SCA Shunt Calibration Resistance Accuracy Verification

This section provides instructions for verifying the RM-4339 SCA shunt calibration resistance

accuracy. Throughout the shunt calibration resistance accuracy verification, use Table 3 to

determine if the RM-4339 is operating within its specified range.

Complete the following steps to test the accuracy of the RM-4339 SCA shunt calibration

resistances:

1. Plug an RJ50 cable into the RM-4339s RJ50 connector of the channel you want to

verify. Connect SCA (pin 1) of the RJ50 cable to the DMM HI input and connect SCA

(pin 10) of the RJ50 cable to the DMM LO input as shown in Figure 1.

Figure 1. RJ50 to DMM Connections

2. Configure the DMM for a 2-wire resistance measurement.

DMM

RJ50 Connector

on the RM-4339

SCA (pin1)

SCA (pin 10)

ΩInput

6|ni.com |RM-4339 Calibration Procedure

3. Create a task to enable SCA shunt calibration.

a. Create and configure an AI Bridge (V/V) measurement according to the values found

in Table 2.

b. Enable the SCA shunt calibration circuit using the following parameters:

Property Node: DAQmx Channel

AI.Bridge.ShuntCal.Select: A

AI.Bridge.ShuntCalASrc: Built-In

AI.Bridge.ShuntCal.ShuntCalAResistance: 100 k

AI.Bridge.ShuntCal.Enable: True

Note These properties are located at Analog Input»General Properties»Signal

Conditioning»Bridge»Shunt Cal.

c. Commit the task by calling DAQmx Control Task with the following parameter:

Action: Commit

4. Take a resistance measurement from the DMM and record the result.

5. Compare the result from step 4 to the Upper Limit and Lower Limit values in Table 3. If

the result is between these values, the module passes the test.

6. Clear the task by calling DAQmx Clear Task.

Table 2. AI Bridge Configuration

Configuration Value

Channel Name Dev1/aix,where xrefers to the channel number.

Measurement Type AI Bridge (V/V)

Voltage Excitation Source Internal

Voltage Excitation Value 3.3

Maximum Value 0.01

Minimum Value -0.01

Units V/V

Bridge Configuration Full

Sample Mode Finite Samples

Sample Clock Rate 100

Samples per Channel 100

RM-4339 Calibration Procedure |© National Instruments |7

7. Repeat steps 1 through 6 for each channel you want to verify.

8. Disconnect the DMM from the module.

Offset Voltage Verification

The offset voltage verification uses the NI PXIe-4339 to measure the offset voltage of the

RM-4339. Prior to measuring the offset voltage of the RM-4339, an offset characterization is

performed on the NI PXIe-4339 using a TB-4339/B/C to provide an electrical short on the input

of the NI PXIe-4339. The temperature variation of the environment should be kept within 1 °C

between measurement of the offset error of the NI PXIe-4339 and the offset measurement of the

RM-4339.

Complete the following steps to verify the offset voltage:

1. Make the following connections:

a. On the TB-4339/B/C, short the AI+ and AI- of all the channels to AIGND.

Note Refer to the NI PXIe-4339 and TB-4339/B/C Installation Guide and Terminal

Block Specifications for the pin assignments and signal names.

b. Connect the female end of the SH96-96-2 cable to the NI PXIe-4339.

c. Connect the TB-4339/B/C to the male end of the SH96-96-2 cable.

Table 3. SCA Shunt Calibration Resistance Accuracy Limits

Nominal Value ()Lower Limit ()Upper Limit ()

100,000 99,900 100,100

8|ni.com |RM-4339 Calibration Procedure

2. Acquire voltage measurements from all channels with the NI PXIe-4339.

a. Create and configure an AI voltage measurement according to the values found in

Table 4.

b. Start the task by calling DAQmx Start Task.

c. Average the readings that you acquired and record the vales as VoffsetPXIe-4339Chx,

where xis the channel number.

d. Clear the task by calling DAQmx Clear Task.

3. Remove the TB-4339/B/C from the SH96-96-2 cable and connect the SH96-96-2 cable to

the 96-pin connector on the back of the RM-4339.

4. Connect an RJ50 cable to each channel with AI+ (pin 2) and AI- (pin 3) connected to

T- (pin 9).

5. Acquire voltage measurements from all channels with the NI PXIe-4339.

a. Create and configure an AI voltage measurement according to the values found in

Table 4.

b. Start the task by calling DAQmx Start Task.

c. Average the readings that you acquired and subtract VoffsetPXIe-4339Chx from the

average values for each channel.

Table 4. AI Voltage Mode Setup

Configuration Value

Channel Name Dev1/ai0:7

Measurement Type AI Voltage

Maximum Value 0.01

Minimum Value -0.01

Units Vo l t s

Input Terminal Configuration Default

Sample Mode Finite Samples

Sample Clock Rate 100

Samples per Channel 100

RM-4339 Calibration Procedure |© National Instruments |9

d. Compare the values obtained in step c with those in Table 5.

e. Clear the task by calling DAQmx Clear Task.

Quarter-Bridge Shunt Calibration Accuracy Verification

Complete the following procedure to verify the quarter-bridge shunt calibration accuracy of the

RM-4339:

1. Set the calibrator to standby mode (STBY).

2. Using an RJ50 cable connect the calibrator to the channel of the RM-4339 you want to

verify.

Note Only one channel can be connected to the calibrator at a time.

a. Connect EX+ (pin 6) to HI, connect QTR (pin 5) to LO and connect AI+ (pin 2)

to LO as shown in Figure 2.

Figure 2. RJ50 to Calibrator Connections

b. QTR and AI+ must be connected together at the calibrator. The EX+ lead wire and the

QTR lead wire must be the same length.

3. Set the calibrator output to 120 , 350 , or 1000 depending on the quarter-bridge

configuration you want to verify. This must match the configuration setting made in step 6 a.

4. Set the calibrator output for compensation off (COMP off).

5. Set the calibrator to operate mode (OPR) to enable the output.

Table 5. Offset Voltage Accuracy Limits

Range (V)

Test Point (V) Lower Limit (V) Upper Limit (V)Minimum Maximum

-0.1 0.1 0-0.000010 0.000010

Calibrator

RJ50 Connector

on the RM-4339

EX+ (pin 6)

AI+ (pin 2)

QTR/RS-

(pin 5)

Normal

ΩOutput

10 |ni.com |RM-4339 Calibration Procedure

6. Acquire an AI Bridge (V/V) measurement with shunt calibration disabled.

a. Create and configure an AI Bridge (V/V) channel according to the values found in

Table 6.

b. Disable the SCB shunt calibration circuit using the following parameters:

Property Node: DAQmx Channel

AI.Bridge.ShuntCal.Enable: False

c. Commit the task by calling DAQmx Control Task with the following parameter:

Action: Commit

d. Wait 5 seconds to allow the circuitry to stabilize. If the calibrator requires more than

a 5 second wait time, use the wait time required by the calibrator.

e. Start the task by calling DAQmx Start Task.

f. Average the readings that you acquired and record the values as ResultSCD.

g. Clear the task by calling DAQmx Clear Task.

7. Acquire an AI Bridge (V/V) measurement with shunt calibration enabled.

a. Create a task.

b. Create and configure an AI Bridge (V/V) channel according to the values found in

Table 6.

Table 6. AI Bridge (V/V) Mode Setup

Configuration Value

Channel Name Dev1/aix, where xrefers to the channel number

Measurement Type AI Bridge (V/V)

Bridge Configuration Quarter

Nominal Bridge Resistance 120 , 350 , 1000 

Voltage Excitation Source Internal

Voltage Excitation Value 3.3 V for 120 configuration, 5 V for 350 and 1 k

configurations

Maximum Value 0.01

Minimum Value -0.01

Units V/V

Sample Mode Finite Samples

Sample Clock Rate 100

Samples per Channel 100

* Use the bridge resistance value that corresponds to the configuration being verified.

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