National Instruments SCXI-1121 Handbuch

National Instruments™, NI™, ni.com™, NI-DAQ™, and SCXI™ are trademarks of National Instruments Corporation. Product and company names

mentioned herein are trademarks or trade names of their respective companies.

CALIBRATION PROCEDURE

SCXI -1121

Introduction

This document contains information and step-by-step instructions for

calibrating the National Instruments (NI) SCXI-1121 module.

What Is Calibration?

Calibration consists of verifying the measurement accuracy of a module

and adjusting for any measurement error. Verification is measuring the

performance of the module and comparing these measurements to the

factory specifications. During calibration, you supply and read voltage

levels using external standards, then you adjust the module calibration

constants. This circuitry compensates for any inaccuracies in the module,

and returns the accuracy of the module to the factory specifications.

Why Should You Calibrate?

The accuracy of electronic components drifts with time and temperature,

which can affect measurement accuracy as a module ages. Calibration

restores these components to their specified accuracy and ensures that the

module still meets NI standards.

How Often Should You Calibrate?

The measurement requirements of your application determine how often

the SCXI-1121 module needs to be calibrated to maintain accuracy.

NI recommends that you perform a complete calibration at least once every

year. You can shorten this interval to 90 days or six months based on the

demands of your application.

™

SCXI-1121 Calibration Procedure 2 ni.com

Equipment and Other Test Requirements

This section describes the test equipment, software, documentation, and

test conditions required for calibrating the SCXI-1121 module.

Test Equipment

Calibration requires a high-precision voltage source with at least 50 ppm

accuracy, a multiranging 5 1/2 digit digital multimeter (DMM) with

15 ppm accuracy, and 120 and 800 Ω±10% precision resistors.

Instruments

NI recommends the following instruments for calibrating the SCXI-1121

module:

• Calibrator—Fluke 5700A

• DMM—NI 4060 or HP 34401A

If these instruments are not available, use the accuracy requirements listed

previously to select substitute calibration instruments.

Connectors

If you do not have custom connection hardware, you need the following

connectors:

• Terminal block, such as the SCXI-1320

• Shielded 68-pin connector cable

• 50-pin ribbon cable

• 50-pin breakout box

• SCXI-1349 adapter

These components give easy access to the individual pins on the

SCXI-1121 front and rear connectors.

Software and Documentation

You do not need any special software or documentation to calibrate the

SCXI-1121 module. This calibration document contains all the information

you need to complete the verification and adjustment procedures. If you

would like more information on the module, refer to the SCXI-1121 User

Manual.

©National Instruments Corporation 3 SCXI-1121 Calibration Procedure

Test Conditions

Follow these guidelines to optimize the connections and environment

during calibration:

• Keep connections to the SCXI-1121 module short. Long cables and

wires act as antennae, picking up extra noise and thermal offsets that

can affect measurements.

• Use shielded copper wire for all cable connections to the device.

Use twisted-pair wire to eliminate noise and thermal offsets.

• Maintain the temperature between 18–28 °C.

• Keep relative humidity below 80%.

• Allow a warm-up time of at least 15 minutes for the SCXI-1121

module to ensure the measurement circuitry is at a stable operating

temperature.

Calibration

The calibration procedure for the SCXI-1121 module consists of the

following steps:

1. Setting up the module for testing.

2. Verifying the existing operation of the module to determine whether it

is operating within its specifications.

3. Adjusting the module with respect to a known voltage source.

4. Verifying that the module is operating within its specifications after

adjustments.

SCXI-1121 Calibration Procedure 4 ni.com

Setting Up the Module

Complete the following steps to set up the SCXI-1121 module for

verification:

1. Remove the grounding screw from the module.

2. Remove the cover on the module to access the potentiometers.

Refer to Figure 1 for an illustration of steps 1 and 2.

Figure 1. Grounding Screw and Cover Removal

3. Remove the side plate of the SCXI chassis.

4. Install the module into slot 4 of the SCXI chassis.

1 Grounding Screw 2 Module Cover

©National Instruments Corporation 5 SCXI-1121 Calibration Procedure

Refer to Figure 2 for an illustration of steps 3 and 4.

Figure 2. Side Plate Removal and Module Installation

The SCXI-1121 module does not need to be connected to a data acquisition

(DAQ) device. Leave the configuration of the digital jumpers W41–W45

and W46 unchanged because they do not affect this procedure.

Configuring the Half-Bridge Completion Jumpers

Verify that the half-bridge completion network is disabled prior to

calibrating the module. Refer to Figure 3 for the location of the jumpers and

Table 1 for the correct jumper settings to disable the network.

1 Thumbscrews 2Slot4 3 Side Plate

MAINFRAME

SCXI

NATIONAL

INSTRUMENTS

SCXI-1121 Calibration Procedure 6 ni.com

Figure 3. SCXI-1121 Parts Locator Diagram

1 Thumbscrews

2 Voltage and Current Adjust

3 Front Connector

4 Serial Number

5 Output Null Adjust Potentiometers

6 Second-Stage Filter Jumpers

7 Rear Signal Connector

8 Product Name, Assembly Number, Revision Letter

9 SCXIbus Connector

10 Terminal Block Mounting Hole

11 Excitation Level Jumpers

12 First-Stage Filter Jumpers

13 Second-Stage Gain Jumpers

14 First-Stage Gain Jumpers

15 Half-Bridge Completion Jumpers

16 Input Null Adjust Potentiometers

17 Excitation Mode Jumpers

18 Grounding Screw

W33

W32

R12

R13

R16

R17

R26

C2 C3

W14

W15

W16

W17

W18

W19

W27

W28

W29

W36

Q14

D3 D4

D11

D14

D15 D16

U18

U24

U28

U31

U39

W26

R33

U35

R10

U15

C14

C30

Q13

R277

C24

C25

C18

C424

U38

R275

R276

Q1 U1

U19

U20

C125

W31

W30

W21

C42

U22

L1 L2

C22

C21

R274

R1 R15 R25

R35

W20

U17

R21

C19

U14

C26

W38

C85

C70

R28

R27

W35

R30

D23

C29

D29

D38

R29

D22

D37

D28

U36

R32

R31

W34

Q20D34

W49

R22

W24

R18

U25

W23

W22

R20

R19

D10

C36

W10

W11

W12

W13

U40

D21

D17

Q18

D39

C37

D30

Q16 Q17

C423

C15

C39

C38

R45

C33

D13

W25

C20

R46

C143

U51

D40

R281

W45

U61

R99

U27

U33

U9U8

R11

U21

C27

D41

U37

Q21

U48

U60

U50

C34

D19 D20

C425

C16

D18

D26

D27

D36

D35

U47

U46

C32

R23

U11

C105

D12 Q8

U30

U42

D25 Q12

D24 Q11

U41

U34

U16

U10

U23

U29

Q10

U44

U32

W37

U26

S/N

AD705

ISO122P

AD705

ISO122P

HCT08 HCT00 HC05

11 11

1111

LF347

GAINDIP

PRIMARY

GAINDIP

RES

20K

RES

20K

RES

20K

DG409

34182

34072

GAINDIP

34072

AD705

34072

RES

20K

ADG212

78M15

7915CT

AD705

HCT191

R1 R0R2

BAABCDABCDEAB

AEDBADCABAB

AB ABCDABCDEAB

RES

20K

34080

CD4047

LT-

1009

HCT03

HCT240

HCT273

ASSY181505F-01

SCXI-1121

HCT165

R42

R43

W41

Q19

R40

W42

W43

D32

D31

D33

R41

R38

R37

U43

W48W47

R39

U45

AD705

GAINDIP

34072

AD705

BAEDCBADCBA

R36

W39

W40

Q15

W46

R273

W40

W41

W42

W43

BAEDCBADCBABA

R36

Q15

W46

R273

W48W47

W39

15 11

Front Rear

©National Instruments Corporation 7 SCXI-1121 Calibration Procedure

Configuring the Gain Jumpers

Each input channel has two user-configurable gain stages. The first-stage

gain provides gains of 1, 10, 50, and 100. The second-stage gain provides

gains of 1, 2, 5, 10, and 20. The device ships with the first-stage gain set to

100 (position A) and the second-stage gain set to 10 (position D).

To change the gain setting of a specified channel on the module, refer to

Table 2 for the jumper reference designator of the channel gain stage you

want to change, and Figure 3 for the location of this jumper. Move the

jumper to the position indicated in Table 3.

Table 1. Completion Network Jumpers

Channel Jumpers

Enable

Completion

Disable Network

(Factory Setting)

0W1 and W2

1W17 and

W18

2W27 and

W28

3W39 and

W40

A B

1 2 3

A B

1 2 3

W18

A B

W17

1 2 3

W18

A B

W17

1 2 3

W28

A B

W27

1 2 3

W28

A B

W27

1 2 3

W40

A B

W39

1 2 3

W40

A B

W39

1 2 3

SCXI-1121 Calibration Procedure 8 ni.com

The order of the settings for the first- and second-stage gain does not matter

as long as the first-stage gain multiplied by the second-stage gain equals the

desired final gain value.

Configuring the Filter Jumpers

Each input channel also has two user-configurable filter stages.

The SCXI-1121 module ships in the 4 Hz position. Refer to Table 4 to find

the correct jumper setting for the desired cutoff frequency. Figure 3 shows

the locations of the jumper blocks on the SCXI-1121 module. Verify that

both filter stages are set to the same filter setting to ensure that you achieve

the desired bandwidth.

Table 2. Gain Jumper Reference Designators

Input Channel

Number

First-Stage

Gain Jumper

Second-Stage

Gain Jumper

0W3 W4

1W19 W20

2W29 W30

3W41 W42

Table 3. Gain Jumper Positions

Gain Setting Jumper Position

First-Stage 1 D

10 C

50 B

100 A (factory setting)

Second-Stage 1 A

2 B

5 C

10 D (factory setting)

20 E

©National Instruments Corporation 9 SCXI-1121 Calibration Procedure

Configuring the Excitation Jumpers

You can configure each excitation channel of the SCXI-1121 module to

either a voltage or current excitation mode. Each channel has two jumpers

for this purpose. Set both jumpers in the same mode for correct operation

of the excitation channel. Refer to Table 5 to determine how to set up the

module in the mode you want. The SCXI-1121 module ships to you in the

voltage mode.

Table 4. Filter Jumper Settings

Input

Channel

Number

First Filter Jumper Second Filter Jumper

4 Hz

(Factory

Setting) 4 kHz

4 Hz

(Factory

Setting) 4 kHz

0W5-A W5-B W6 W7

1W21-A W21-B W8 W9

2W31-A W31-B W10 W11

3W43-A W43-B W12 W13

Table 5. Voltage and Current Mode Excitation Jumper Settings

Excitation

Channel Jumpers

Voltage Mode

(Factory Setting) Current Mode

0W14 and

W15

1W22 and

W23

2W34 and

W35

3W46 and

W47

W14

1 2 3

W15

1 2 3

W14

1 2 3

W15

1 2 3

W22

1 2 3

W23

1 2 3

W22

1 2 3

W23

1 2 3

W34

1 2 3

W35

1 2 3

W34

1 2 3

W35

1 2 3

W46

1 2 3

W47

1 2 3

W46

1 2 3

W47

1 2 3

SCXI-1121 Calibration Procedure 10 ni.com

Configuring the Excitation Level

Each excitation channel of the SCXI-1121 module has two different current

or voltage levels. You can set a given channel to one of the following level

modes:

• In the current mode—0.150 or 0.450 mA

• In the voltage mode—3.333 or 10 V

After selecting the excitation mode of operation desired—voltage or

current—as described in the previous section, refer to Table 6 to set the

SCXI-1121 module for the level of operation. The SCXI-1121 module

ships with the voltage mode set to 3.333 V.

Table 6. Excitation Level Jumper Settings

Excitation

Channel Jumpers

3.333 V or

0.150 mA

(Factory Setting) 10 V or 0.450 mA

0W16 and

W26

1W24 and

W25

2W36 and

W37

3W48 and

W49

W16

1 2 3

W26 W16

1 2 3

W26

W24

1 2 3

W25

1 2 3

W24

1 2 3

W25

1 2 3

W36

1 2 3

W37

1 2 3

W36

1 2 3

W37

1 2 3

W48

1 2 3

W49

1 2 3

W48

1 2 3

W49

1 2 3

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