National Instruments SCXI-1120/D Manual

National Instruments™,NI

™,ni.com

™, 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 -1120/D

Introduction

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

calibrating the National Instruments (NI) SCXI-1120 and SCXI-1120D

modules.

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

circuitry. 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-1120/D 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-1120/D 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-1120/D modules.

Test Equipment

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

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

15 ppm accuracy.

Instruments

NI recommends the following instruments for calibrating SCXI-1120/D

modules:

• 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-1120/D module front and rear connectors.

Software and Documentation

No special software or documentation is necessary to calibrate the

SCXI-1120/D 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-1120/D User Manual.

©National Instruments Corporation 3 SCXI-1120/D Calibration Procedure

Test Conditions

Follow these guidelines to optimize the connections and environment

during calibration:

•Keep connections to the SCXI-1120/D 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-1120/D

module to ensure the measurement circuitry is at a stable operating

temperature.

Calibration

The calibration procedure for the SCXI-1120/D module consists of the

following steps:

1. Set up the module for testing.

2. Verify the existing operation of the module to determine whether it is

operating within its specifications.

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

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

adjustments.

SCXI-1120/D Calibration Procedure 4 ni.com

Setting Up the Module

Refer to Figures 1 and 2 while performing the following steps to set up the

SCXI-1120/D module for verification:

1. Remove the grounding screw from the module.

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

Figure 1. Grounding Screw and Module Cover Removal

3. Remove the side plate of the SCXI chassis.

4. Install the SCXI-1120/D into slot 4 of the SCXI chassis.

1 Grounding screw 2 Module cover

©National Instruments Corporation 5 SCXI-1120/D Calibration Procedure

Figure 2. Side Plate Removal and Module Installation

The SCXI-1120/D module does not need to be connected to a data

acquisition (DAQ) device. Leave the configuration of the digital jumpers

W41–W43 and W46 unchanged because they do not affect this 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. Table 1 shows the jumper reference designators

for gain selection associated with each channel. Table 2 shows how to

position each jumper to select the desired gain for each channel.

1 Thumbscrews 2Slot4 3Sideplate

Table 1. Gain Jumper Reference Designators

Input Channel

Number

First-Stage

Gain Jumper

Second-Stage

Gain Jumper

0W1 W9

1W2 W10

2W3 W11

MAINFRAME

SCXI

NATIONAL

INSTRUMENTS

SCXI-1120/D Calibration Procedure 6 ni.com

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

the appropriate jumper on the module to the position indicated in Table 2.

Refer to Table 1 for jumper reference designators, and Figure 3 for the

location of the jumpers.

3W4 W12

4W5 W13

5W6 W14

6W7 W15

7W8 W16

Table 2. Gain Jumper Positions

Gain Setting Jumper Position

First Stage 1

100

A (factory setting)

Second Stage 1

D (factory setting)

Table 1. Gain Jumper Reference Designators (Continued)

Input Channel

Number

First-Stage

Gain Jumper

Second-Stage

Gain Jumper

©National Instruments Corporation 7 SCXI-1120/D Calibration Procedure

Figure 3. SCXI-1120/D Parts Locator Diagram

Note The SCXI-1120D module has an additional fixed pre-stage gain of 0.5.

1 Thumbscrews

2 Front Connector

3 Product Name, Assembly Number,

and Serial Number

4 Output Null Adjust Potentiometers

5 Second-Stage Filter Jumpers

6 Rear Signal Connector

7 SCXIbus Connector

8 Input Null Adjust Potentiometers

9 First-Stage Gain Jumpers

10 Second-Stage Gain Jumpers

11 First-Stage Filter Jumpers

12 Terminal Block Mounting Hole

13 Grounding Screw

4 5

89 10 11

Front Rear

V25 V26 W27 W28 W29W30 W31V32V33 W34 W35 W36V37 V38 V39 V40

W45

W43

W42

R18

AA ABB BCCDDE

Q12

AD705

GAINDIP

U14

22 W14

SCXI-1120/D 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—multiplied by 0.5 when using the SCXI-1120D—equals the desired

final gain value.

•SCXI-1120—To determine the overall gain of a given channel on the

SCXI-1120 module:

•SCXI-1120D—To determine the overall gain of a given channel on the

SCXI-1120D module:

Configuring the Filter Jumpers

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

The SCXI-1120 module ships in the 4 Hz position and the SCXI-1120/D

module ships in the 4.5 kHz position. Refer to Table 3 or 4 to find the

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

locations of the jumper blocks on the SCXI-1120/D modules. Verify that

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

the required bandwidth.

Table 3. SCXI-1120 Filter Jumper Settings

Input

Channel

Number

First Filter Jumper Second Filter Jumper

4Hz

(Factory

Setting) 10 kHz

4Hz

(Factory

Setting) 10 kHz

0W17-A W17-B W25 W26

1W18-A W18-B W27 W28

2W19-A W19-B W29 W30

3W20-A W20-B W31 W32

4W21-A W21-B W33 W34

5W22-A W22-B W35 W36

6W23-A W23-B W37 W38

7W24-A W24-B W39 W40

irst-Stage Gain Second-Stage Gain×Overall Gain=

First-Stage Gain Second-Stage Gain×()0.5×Overall Gain=

©National Instruments Corporation 9 SCXI-1120/D Calibration Procedure

Verifying the Operation of the Module

The verification procedure determines how well the SCXI-1120/D module

is meeting its specifications. You can use this information to select the

appropriatecalibrationintervalforyour application. Refer totheSetting Up

the Module section for information onhowtoconfigure thechannel filter

and channel gain.

Complete the following steps to verify the operation of the SCXI-1120/D

module:

1. Read the Test Conditions section inthisdocument.

2. Refer to Table 7 for the SCXI-1120 module or Table 8 for the

SCXI-1120D module for all acceptable settings for the module.

Although NI recommends verifying all ranges and gains, you can

save time by checking only those ranges used in your application.

3. Set the channel filter for all channels on the module to 4 Hz for

the SCXI-1120 module or 4.5 kHz for the SCXI-1120D module.

4. Set the channel gain on all channels to the gain you want to test,

starting with the smallest gain available for the module. Available

gainsareshowninTables7and8.

5. Connect the calibrator to the analog input channel you are testing,

starting with channel 0.

If you do not have an SCXI terminal block such as the SCXI-1320,

refer to Table 5 to determine the pins on the 96-pin front connector that

correspond to the positive and negative inputs of the specified channel.

Table 4. SCXI-1120D Filter Jumper Allocation

Input

Channel

Number

First Filter Jumper Second Filter Jumper

4.5 kHz

(Factory

Setting) 22.5 kHz

4.5 kHz

(Factory

Setting) 22.5 kHz

0W17-A W17-B W26 W25

1W18-A W18-B W28 W27

2W19-A W19-B W30 W29

3W20-A W20-B W32 W31

4W21-A W21-B W34 W33

5W22-A W22-B W36 W35

6W23-A W23-B W38 W37

7W24-A W24-B W40 W39

SCXI-1120/D Calibration Procedure 10 ni.com

For example, the positive input for channel 0 is pin A32, which is

labeled CH0+. The negative input for channel 0 is pin C32, which is

labeled CH0–.

Table 5. SCXI-1120/D Front Connector Pin Assignments

Pin Number Column A Column B Column C

32 CH0+ NP CH0–

31 NP NP NP

30 CH1+ NP CH1–

29 NP NP NP

28 NC NP NC

27 NP NP NP

26 CH2+ NP CH2–

25 NP NP NP

24 CH3+ NP CH3–

23 NP NP NP

22 NC NP NC

21 NP NP NP

20 CH4+ NP CH4–

19 NP NP NP

18 CH5+ NP CH5–

17 NP NP NP

16 NC NP NC

15 NP NP NP

14 CH6+ NP CH6–

13 NP NP NP

12 CH7+ NP CH7–

11 NP NP NP

10 NC NP NC

9NP NP NP

8NC NP RSVD

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