National Instruments SC Express PXIe-4330 Manual

CALIBRATION PROCEDURE

PXIe-4330/4331

This document contains information about verifying and adjusting National Instruments

PXIe-4330/4331 modules using NI-DAQmx 9.1 and later. For more information about

calibration, visit ni.com/calibration.

Contents

Software.................................................................................................................................... 2

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

Calibration Interval................................................................................................................... 2

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

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

Calibration Procedure ............................................................................................................... 4

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

Connecting the Equipment ............................................................................................... 5

Install the CAL-4330 Into a Rack (Optional)........................................................... 7

Connect the Calibration and Switch Cables ............................................................. 8

Connect the DMM and Multifunction Calibrator Cables......................................... 10

Verification Procedures .................................................................................................... 11

Gain Accuracy Verification...................................................................................... 11

Input Offset Verification .......................................................................................... 14

Shunt Quarter-Bridge Calibration Accuracy Verification........................................ 15

Shunt Calibration Resistance Accuracy Verification ............................................... 17

Excitation Voltage Verification................................................................................ 18

Gain and Offset Adjustment Procedure............................................................................ 20

Test Limits................................................................................................................................ 24

Gain Accuracy Test Limits............................................................................................... 25

Input Offset Test Limits ................................................................................................... 31

Shunt Quarter-Bridge Calibration Test Limits ................................................................. 32

Shunt Calibration Resistance Test Limits ........................................................................ 32

Excitation Voltage Test Limits......................................................................................... 33

Appendix A: Connection Path Details...................................................................................... 34

Worldwide Support and Services ............................................................................................. 40

2|ni.com |PXIe-4330/4331 Calibration Procedure

Software

Install NI-DAQmx 9.1 or later on the calibration computer. NI-DAQmx includes high-level

function calls to simplify the task of writing software to calibrate modules. You must have the

proper module driver installed on the calibration system before calibrating the module.

Note NI recommends that you install the NI-DAQmx driver software before

physically installing the PXIe-4330/4331. NI-DAQmx, available at ni.com/

downloads, configures and controls the PXIe-4330/4331.

NI-DAQmx supports a number of programming languages, including LabVIEW,

LabWindows™/CVI™, C/C++, C#, and Visual Basic .NET.

Documentation

The following documents are your primary references for writing your calibration utility with

NI-DAQmx. You can download the latest version of these documents from the NI Web site at

ni.com/manuals.

•TheNI SC Express 4330/4331 Installation Guide and Terminal Block Specifications

provides instructions for installing and configuring the NI PXIe-4330/4331 module.

•TheNI PXIe-4330/4331 User Manual describes how to use the NI PXIe-4330/4331.

•TheNI PXIe-4330/4331 Specifications lists the specifications for the NI PXIe-4330/4331.

•TheNI-DAQmx Help includes information about creating applications that use the

NI-DAQmx driver.

•TheNI-DAQmx C Reference Help includes information about the functions in the driver.

Calibration Interval

National Instruments recommends a calibration interval of one year for the PXIe-4330/4331.

Adjust and verify the PXIe-4330/4331 at the recommended calibration interval based on the

measurement accuracy demands of your application.

PXIe-4330/4331 Calibration Procedure |© National Instruments |3

Test Equipment

National Instruments recommends that you use the equipment in Table 1 for calibrating an

PXIe-4330/4331 module.

Table 1. Recommended Equipment

Equipment Recommended Model(s) Requirements

Multifunction

calibrator

Fluke 5520A If this instrument is unavailable, use a

calibrator that can provide resistance values

in the range of 120 Ωto 1 k Ωwith 0.01 Ω

resolution, an accuracy of 90 ppm or better,

automatic lead wire compensation, and

2-wire output compensation.

DMMs (x2) PXI-4071 If this instrument is unavailable, use

multiranging 6 1/2 digit DMMs with a DC

voltage accuracy of 40 ppm or better of

reading +6 ppm of range for the 10 V and

1 V ranges, and 4-wire resistance

measurement capability with resistance

accuracy of 80 ppm or better of reading

+6 ppm range for the 100 k Ωrange

Chassis PXIe-1062Q If this chassis is unavailable, use another

PXIe chassis

Switch modules (x2) PXIe-2737 4x64 2-wire relay module

160-Pin DIN to

160-Pin DIN cable

for PXIe-2737 (x2)

NI Part Number: 782417-02 Cable for connecting the PXIe-2737s to the

CAL-4330

CAL-4330 to

PXIe-4330/4331

calibration cable

NI Part Number: 787003-01 Cable and included standoffs for connecting

the PXIe-4330/4331 DUT to the CAL-4330

Connection

accessory

CAL-4330, NI Part Number

786988-01

Calibration Fixture to enable automated

calibration of the PXIe-4330/4331

Banana-to-banana

patch cables (x10)

Five Pomona 1440-36-0 black

banana plug patch cords

(cables)

Five Pamona 1440-36-1 red

banana plug patch cords

(cables)

—

4|ni.com |PXIe-4330/4331 Calibration Procedure

Test Conditions

The following setup and environmental conditions are required to ensure the NI device meets

published specifications.

• Keep connections to the module as short as possible. Long cables and wires act as antennae,

picking up extra noise that can affect measurements.

• Use shielded copper wire for all cable connections to the module. Use twisted-pair wire to

eliminate noise and thermal offsets.

• Maintain an ambient temperature of 23 °C ±5 °C.

• Keep relative humidity below 80%.

• Allow a warm-up time of at least 15 minutes to ensure that the measurement circuitry is at

a stable operating temperature.

• 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.

• Warm-up time for test equipment may vary depending on the manufacturer. Please refer to

the equipment’s Operators Manual for specified warm-up time.

• To meet Fluke 5520A specifications, zero the Calibrator every 7 days, or when the

Calibrator ambient temperature changes by more than 5 °C. Warm-up time for Fluke 5520A

is 30 minutes.

Calibration Procedure

This section provides instructions for verifying the performance of the PXIe-4330/4331.

The calibration process consists of the following steps:

1. Initial Setup—Install the module and configure it in Measurement & Automation Explorer

(MAX).

2. Verification Procedures—Verify the existing operation of the module. This step confirms

whether the module is operating within the published specifications—gain accuracy, input

offset, shunt quarter-bridge calibration, shunt calibration resistance, and excitation—prior

to adjustment.

3. Gain and Offset Adjustment Procedure—If necessary, perform an external calibration that

adjusts the module calibration constants with respect to a known calibration source.

4. Reverification—Repeat the verification procedure to ensure that the module is operating

within the published specifications after adjustment.

PXIe-4330/4331 Calibration Procedure |© National Instruments |5

Initial Setup

You must configure the module in MAX to communicate with NI-DAQmx.

Complete the following steps to configure a module in MAX. Refer to the

NI SC Express 4330/4331 Installation Guide and Terminal Block Specifications for complete

installation instructions.

1. Install the NI-DAQmx, 9.1 or later, driver software.

Caution Always have the PXI Express chassis turned off when inserting a module.

2. Insert the module into an available slot in the PXI Express chassis.

3. Power on the chassis.

4. Launch MAX.

5. Expand Devices and Interfaces to confirm that MAX detects the module.

6. Right-click the module name and select Self-Test to ensure that the module is working

properly.

Note When a module is configured with MAX, it is assigned a module name. Each

function call uses this module name to determine which DAQ module to calibrate.

This document uses Dev1 to refer to the module name. In the following procedures,

use the module name as it appears in MAX.

Connecting the Equipment

The CAL-4330 and two switch modules provide the ability to programmatically connect the

required module connections as needed for the various verification and calibration steps.

Refer to the specific verification or calibration procedure section for information describing the

required switch connections. Detailed connection paths for each of the verification calibration

steps are shown in Appendix A: Connection Path Details. Before connecting or disconnecting

the calibrator from the module, always set the calibrator to standby mode (STBY).

6|ni.com |PXIe-4330/4331 Calibration Procedure

Refer to Figure 1 for a block diagram of the equipment connections. Figure 2 and Figure 3 show

the front and rear connectors on the CAL-4330.

Figure 1. Block Diagram

Figure 2. Front Connectors

Figure 3. Rear Connectors

1SWITCH1 2SWITCH2 3 DEVICE UNDER TEST

1DMM2 2DMM1 3CALIBRATOR

CAL-4330

2-wire

4x64 Switch

2-wire

4x64 Switch

PXIe-4330 or

PXIe 4331

DMM 2

SENSE HI

SENSE LO

DMM 1

VOLTSHI

CALIBRATOR

VOLTSLO

AUX HI

AUX LO

SWITCH 1

SWITCH 2

DUT

CAL-4330

SWITCH 1 SWITCH 2

DEVICE UNDER TEST

PXIe-4330/4331

DMM 2 DMM 1

CAL-4330

CALIBRATOR

SENSE

LO HI

AUX

LO HI

VOLTS

LO HI

VOLTS

LO HI

VOLTS

LO HI

PXIe-4330/4331 Calibration Procedure |© National Instruments |7

Install the CAL-4330 Into a Rack (Optional)

To install the CAL-4330 into a rack, complete the following steps:

1. Attach the two rack-mount brackets to the sides of the CAL-4330. The brackets and screws

are included with the CAL-4330.

Figure 4. Using the Rack-Mount Brackets

2. Place the CAL-4330 in the desired position in your rack.

3. Install and tighten the four rack-mounting screws that are included with the CAL-4330.

If the chassis is not already installed in the rack (optional), complete the following steps:

1. Attach the PXIe chassis rack-mount hardware to the PXIe chassis. Refer to your

rack-mount kit installation guide for more details.

2. Mount the PXIe chassis in the rack in the desired position. Refer to your rack-mount kit

installation guide for more details.

1 CAL-4330

2 Rack-Mount Brackets (2)

3 Rack-Mount Bracket Mounting Screws (4)

4 Rack-Mounting Screws (4)

SWITCH 1 SWITCH 2 DEVICEUNDER TEST

PXIe-4330/4331

CAL-4330

8|ni.com |PXIe-4330/4331 Calibration Procedure

Connect the Calibration and Switch Cables

Figure 5. Connecting the Calibration Cable

1. Screw the two standoffs into the PXIe-4330/4331 module and tighten the standoffs to

1.30 N · m (11.5 lb · in.), as shown in Figure 5.

2. Connect the male end of the calibration cable to the CAL-4330 and tighten the two jack

screws to 0.90 N · m (8.0 lb · in.), as shown in Figure 5.

3. Connect the female end of the calibration cable to the PXIe-4330/4331 and tighten the two

jack screws to 0.90 N · m (8.0 lb · in.), as shown in Figure 5.

1CAL-4330

2 PXI Chassis

3 PXIe-4330/4331 (DUT)

4 Standoffs (2)

5 Jack Screws (2)

6 CAL-4330 to PXIe-4330/4331 Calibration Cable

7 Jack Screws (2)

NI PXIe-1062Q

COOLINGCLEARANCEANDFANFILTERMAINTENANCEREQUIRED.SEEMANUAL.

COOLING CLEARANCEANDFANFILTERMAINTENANCEREQUIRED. SEEMANUAL.

SWITCH 1SWITCH 2DEVICEUNDERTEST

PXIe-4330/4331

CAL-4330

PXIe-4330/4331 Calibration Procedure |© National Instruments |9

4. Connect the two 160-Pin DIN to 160-Pin DIN cables from the CAL-4330 to the two

PXIe-2737 modules and tighten all the jack screws to 0.56 N · m (5.0 lb · in.), as shown in

Figure 6 and Figure 7.

Figure 6. Connecting the Switch 2 Cable

Figure 7. Connecting the Switch 1 Cable

NIPXIe-1062Q

COOLINGCLEARANCEANDFANFILTERMAINTENANCEREQUIRED.SEEMANUAL.

150V

NI PXIe-1062Q

NIPXIe-1062Q

COOLING CLEARANCEANDFANFILTERMAINTENANCEREQUIRED.SEEMANUAL.

COOLINGCLEARANCEANDFANFILTERMAINTENANCEREQUIRED.SEEMANUAL.

150V150V

150V

150V150V

150V

10 |ni.com |PXIe-4330/4331 Calibration Procedure

Connect the DMM and Multifunction Calibrator Cables

1. Connect DMM 1 on the back of the CAL-4330 to a PXI-4071 as shown in Figure 8.

Figure 8. DMM 1

2. Connect DMM 2 on the back of the CAL-4330 to another PXI-4071 as shown in Figure 9.

Figure 9. DMM 2

1CAL-4330 2PXI-4071

300 V

MAX

CATII

AUX I/O

1 A

250 V

MAX

300 V

MAX

CATII

5 V

MAX

AMPS

INPUT

V˖

SENSE

˖4W

NI PXI-4071

6½-Digit FlexDMM

VOLTS

DMM 1

LO HI

300 V

MAX

CATII

AUX I/ O

1 A

250 V

MAX

300 V

MAX

CATII

5 V

MAX

AMPS

INPUT

V˖

SENSE

˖4W

NI PXI-4071

6½-Digit FlexDMM

SENSE

DMM 2

LO HI

VOLTS

LO HI

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