scxi1120_25.pdf

SCXI 8-Channel

Isolation Ampliﬁers

SCXI-1125

8 isolated channels

333 kS/s (any gain)

Programmatic gain per channel

Programmatic ﬁlter per channel

(4 Hz, 10 kHz)

300 V rms working isolation

per channel

Automatic input zeroing

Signal inputs from ±2.5 mV to ±300 V

(1000 VDC with the TBX-1316)

SCXI-1120/SCXI-1120D

8 isolated channels

333 kS/s (any gain)

Jumper selectable gain per channel

Jumper selectable ﬁlter per channel

(4 Hz, 10 kHz for SCXI-1120)

(4.5 kHz, 22.5 kHz for SCXI-1120D)

250 V rms working isolation

per channel

Signal inputs from ±2.5 mV to ±250 V

(1000 VDC with the TBX-1316)

Driver Software

NI-DAQ

Windows 2000/NT/Me/9x

Mac OS (1120 only)

Application Software

LabVIEW

Measurement Studio

Lookout

Calibration Certiﬁcate Included (SCXI-1125 Only)

Module

Signal Compatibility

addition, the SCXI-1125 is CE

certified as double insulated,

Category II, for 300 V rms of

operational isolation.

±2.5 mV

±5 mV to ±250 mV

±1000 V

0-20 mA

Thermocouple

EXPRESS

CODES

SCXI-1125

SCXI-1120

SCXI-1120D

–

For information or to

buy products online,

visit ni.com/catalog

and enter:

Table 1. SCXI Module Compatibility

SCXI-1120, SCXI-1120D

The analog inputs of the 1120 Series consist of

eight isolated ampliﬁers. You can conﬁgure

each ampliﬁer using jumpers for input ranges

from ±2.5 mV to ±5 V (SCXI-1120) or ±5 mV

to ±10 V (SCXI-1120D). With the SCXI-1327

high-voltage attenuator terminal block, the

input range is extended to ±250 V. With the

TBX-1316, the input range is extended to ±1000 VDC (680 V rms ). Each

channel also includes a lowpass ﬁlter that is jumper conﬁgurable for 4 Hz

or 10 kHz (SCXI-1120), or for 4.5 or 22.5 kHz (SCXI-1120D). Each channel

is individually isolated with a working common-mode voltage of 250 V rms

between channels or channel to earth. In addition, the SCXI-1120 and SCXI-

1120D are CE certiﬁed as double insulated, Category II, for 250 V rms of

operational isolation.

Overview

National Instruments offers three different 8-channel isolated analog

input modules for SCXI. These modules share a common architecture,

providing 250 V rms to 300 V rms of working isolation and lowpass

ﬁltering for each analog input channel. This architecture is ideal for

amplification and isolation of millivolt sources, volt sources, 0 to

20 mA, 4 to 20 mA, and thermocouples. Each module can multiplex

these eight channels into a single channel of the DAQ device, and you

add modules to increase channel count. These modules also offer

parallel mode operation.

scxi1120

scxi1120d

scxi1125

Analog Input

SCXI-1125

The analog inputs of the SCXI-1125 consist of eight programmable

isolation ampliﬁers. You can program each channel independently for

input ranges from ±2.5 mV to ±5 V. With the SCXI-1327 high-voltage

attenuator terminal block, the input range is extended to ±300 V. With

the TBX-1316, the input range is extended to ±1000 VDC (680 V rms ).

Each channel also includes a programmatic lowpass ﬁlter that you can

configure for 4 Hz or 10 kHz. With the SCXI-1125 you can perform

random scanning meaning you can scan any channel in any order.

Each channel is individually isolated with a working common-mode

voltage of 300 V rms between channels or channel to earth. In

Modes of Operation

Multiplexer

In multiplexed mode, these modules multiplex all eight conditioned

signals, along with the optional temperature sensor reading provided

on the MTEMP line, onto channel MCH0 of the rear signal connector,

to which you can connect a single input channel of the DAQ device.

Furthermore, you can connect the multiplexed output of each

module using programmable switches to analog bus 0 of the SCXIbus

National Instruments

Tel: (512) 794-0100 • Fax: (512) 683-9300 • info@ni.com • ni.com

501

SCXI 8-Channel

Isolation Ampliﬁers

Figure 1. SCXI-1125 Block Diagram

and to other modules. Several SCXI modules can operate in this

manner with a single DAQ device. Control circuitry also includes a

Module ID register, which can be read using software for module

identification. Each module also has internal counters for the high-

speed automatic scanning mode with any E Series product. A scan

clock signal from the DAQ device synchronizes the scanning. Using

this hardware scanning mode, you can scan channels at rates up to

333 kS/s (3 µs/channel).

blocks. The SCXI-1125 can scan the sensor along with other channels,

but the SCXI-1120 Series must read this sensor as a separate analog

input operation.

Calibration

The SCXI-1125 contains calibration hardware to null out error sources.

With automatic input zeroing, software-programmable analog

switches ground the inputs of each of the instrumentation ampliﬁers

for offset error calibration. By providing an external reference voltage,

you can calibrate the system to your exact operating conditions. An

onboard EEPROM stores the calibration constants for each channel for

each input range in a user-deﬁned area. The EEPROM also stores a set

of factory calibration constants in permanent memory, and cannot be

modiﬁed. National Instruments driver software transparently uses the

calibration constants to correct for gain and offset errors.

The SCXI-1120 Series modules have offset potentiometers

so you can calibrate each channel manually.

Parallel

In parallel mode, you can pass each conditioned channel directly to

the analog inputs of the DAQ device. This configuration requires a

dedicated DAQ device and cable for each module operating in

parallel mode.

Cold-Junction Compensation

Each of these modules can read the cold-junction sensor from the

SCXI-1320, SCXI-1321, SCXI-1327, SCXI-1328, and TBX-1328 terminal

502

National Instruments

Tel: (512) 794-0100 • Fax: (512) 683-9300 • info@ni.com • ni.com

SCXI 8-Channel

Isolation Ampliﬁers

Figure 2. SCXI-1120 and SCXI-1120D Block Diagram

Signal Connection

Unconditioned signals from the transducers and signal sources connect

to screw terminals or BNC connectors located on removable front-

mounting terminal blocks (SCXI-1305, SCXI-1313, SCXI-1320,

SCXI-1327, SCXI-1328, SCXI-1338). Alternatively you can connect input

signals to the TBX-1328 or TBX-1329 DIN-rail mountable screw terminal

blocks, or TBX-1316 ﬂush mount terminal block which you cable to the

SCXI-1125 or SCXI-1120 Series with the SH32-32-A shielded cable. A

temperature sensor is located on the terminal block (SCXI-1320, SCXI-

1327, SCXI-1328, TBX-1328) for thermocouple cold-junction

compensation. The SCXI-1328 and TBX-1328 are high-precision,

isothermal terminal blocks for maximum accuracy when using

thermocouples. The TBX-1316 provides high-voltage attenuation for

voltage signals up to 1000 VDC, or 680 V rms AC voltage, and is rated

for Category III installations. The TBX-1329 provides selectable AC signal

coupling. The SCXI-1338 has socketed 249 Ω precision resistors for

measuring 0 to 20 mA or 4 to 20 mA current inputs. The SCXI-1313 and

SCXI-1327 extend the input range for high-voltage inputs up to 250 V.

In addition, a general-purpose connector and shell, the SCXI-1330, is

available as a low-cost alternative for custom wiring of the input signals.

National Instruments

Tel: (512) 794-0100 • Fax: (512) 683-9300 • info@ni.com • ni.com

503

SCXI 8-Channel

Isolation Ampliﬁers

Terminal Block

Type

CJ Sensor

Compatible Modules

Cabling

Special Functions

Page

SCXI-1125

SCXI-1313

Screw Terminals

–

Programmable 100:1 attenuator

538

(777687-13)

Front-mounting

SCXI-1320

Screw Terminals

–

IC Sensor for CJC

539

(777687-20)

Front-mounting

SCXI-1327

Screw Terminals

–

100:1 attenuator

539

(777687-27)

Front-mounting

SCXI-1328

Screw Terminals

–

Isothermal construction

540

(777687-28)

Front-mounting

Prewired ground referencing

SCXI-1125

SCXI-1120

SCXI-1120D

SCXI-1338

Screw Terminals

–

For current inputs

540

(777687-38)

Front-mounting

SCXI-1305 1

BNC connectors

–

AC coupling

538

(777687-05)

Front-mounting

TBX-1316

Screw terminals

SH32-32-A

200:1 attenuator

542

(777207-16)

DIN-rail mount

(183230-01)

TBX-1328

Screw terminals

SH32-32-A

DIN-rail mount

542

(777207-28)

DIN-rail mount

(183230-01)

Isothermal construction

Prewired ground referencing

3 terminals per channel

TBX-1329

Screw terminals

–

SH32-32-A

DIN- rail mount

542

(777207-29)

DIN-rail mount

(183230-01)

Isothermal construction

Prewired ground referencing

3 terminals per channel

SCXI-1330

Solder pins

–

Low-cost connector and

540

(777687-30)

Front-mounting

shell assembly

1 The SCXI-1305 is not intended for high-voltage (>42 V) usage.

Table 2. Terminal Block Options for SCXI-1125 and SCXI-1120 Series

See page 470 to conﬁgure your complete SCXI system.

Ordering Information

SCXI-1125 ..........................................................776572-25

SCXI-1120 ..........................................................776572-20

SCXI-1120D ....................................................776572-20D

Accessories

SCXI current resistors (4-pack)...............................776582-01

Extended Warranty

and Value Added Services ...................................page 880

504

National Instruments

Tel: (512) 794-0100 • Fax: (512) 683-9300 • info@ni.com • ni.com

SCXI 8-Channel

Isolation Ampliﬁers

Speciﬁcations

Complete Accuracy Table

Absolute Accuracy (15 to 35 °C)

Temperatµre Drift

SCXI Module

Range

Gain

% of Reading

System Noise (peak, 3 sigma)

Typical

Max

Offset

Single Pt.

Avg

% of

Offset

4 Hz

10 kHz

4 Hz

10 kHz

Reading/°C

(V/°C)

SCXI-1125

±1000 V rms 3

0.005

0.0848

0.1498

1.08 V

220 mV

600 mV

84 mV

66.4 mV

0.0029

44 mV

±500 V rms 3

0.01

0.0848

0.1498

0.56 V

160 mV

300 mV

32 mV

33 mV

0.0029

44 mV

±300 V rms 3

0.01 2

0.0848

0.1498

0.5 V

29.8 mV

74.7 mV

5.23 mV

8.31 mV

0.0029

22 mV

±250 V 3

0.02 2

0.0848

0.1498

250 mV

19.9 mV

37.4 mV

2.62 mV

4.16 mV

0.0029

11 mV

±100 V 3

0.05 2

0.0848

0.1498

100 mV

5.96 mV

14.9 mV

1.05 mV

1.66 mV

0.0029

4.4 mV

±50 V 3

0.1 2

0.0848

0.1498

50 mV

2.98 mV

7.48 mV

523 µV

831 µV

0.0029

2.2 mV

±25 V 3

0.2 2

0.0848

0.1498

25 mV

1.49 mV

3.74 mV

262 µV

415 µV

0.0029

1.12 mV

±10 V 3

0.5 2

0.0848

0.1498

10 mV

596 µV

1.50 mV

105 µV

166 µV

0.0029

460 µV

±5 V

0.0778

0.1478

5.0 mV

298 µV

748 µV

52.3 µV

83.1 µV

0.0027

240 µV

±2.5 V

0.0778

0.1478

2.5 mV

149 µV

374 µV

26.2 µV

41.5 µV

0.0027

130 µV

±1 V

0.0778

0.1478

1.0 mV

59.6 µV

150 µV

10.5 µV

16.6 µV

0.0027

64 µV

±500 mV

0.0778

0.1478

502 µV

29.8 µV

74.8 µV

5.23 µV

8.31 µV

0.0027

42 µV

±250 mV

0.0778

0.1478

252 µV

14.9 µV

37.4 µV

2.62 µV

4.15 µV

0.0027

31 µV

±100 mV

0.0778

0.1478

102 µV

5.96 µV

15.0 µV

1.05 µV

1.66 µV

0.0027

24.4 µV

±50 mV

100

0.0778

0.1478

52 µV

2.98 µV

7.48 µV

0.523 µV

0.831 µV

0.0027

22.2 µV

±25 mV

200

0.0778

0.1478

27 µV

1.49 µV

4.54 µV

0.262 µV

0.504 µV

0.0027

21.1 µV

±20 mV

250

0.0778

0.1478

22 µV

1.19 µV

4.60 µV

0.209 µV

0.511 µV

0.0027

20.9 µV

±10 mV

500

0.0778

0.1478

12 µV

0.5962 µV

3.12 µV

0.1046 µV

0.347 µV

0.0027

20.3 µV

±5 mV

1000

0.0778

0.1478

7 µV

0.298 µV

2.81 µV

0.052 µV

0.312 µV

0.0027

20.2 µV

±2.5 mV

2000

0.0778

0.1478

4.5 µV

0.149 µV

2.66 µV

0.026 µV

0.296 µV

0.0027

20.1 µV

SCXI-1120

±1000 V rms 3

0.005

0.0848

0.1498

1.08 V

220 mV

600 mV

84 mV

66.4 mV

0.0029

44 mV

±500 V rms 3

0.01

0.0848

0.1498

0.56 V

160 mV

300 mV

32 mV

33 mV

0.0029

44 mV

±250 V rms 3

0.01 2

0.2548

0.6498

0.5 mV

29.8 mV

74.7 mV

5.23 mV

8.3 mV

0.0029

22.0 mV

±250 V 3

0.02 2

0.2548

0.6498

250 mV

14.9 mV

37.4 mV

2.61 mV

4.15 mV

0.0029

11.0 mV

±100 V 3

0.05 2

0.2548

0.6498

100 mV

5.96 mV

15.0 mV

1.05 mV

1.66 mV

0.0029

4.4 mV

±50 V 3

0.1 2

0.2548

0.6498

50 mV

2.98 mV

7.48 mV

523 µV

831 µV

0.0029

2.2 mV

±25 V 3

0.2 2

0.2548

0.6498

25 mV

1.49 mV

3.74 mV

262 µV

415 µV

0.0029

1.12 mV

±10 V 3

0.5 2

0.2548

0.6498

10 mV

596 µV

1.50 mV

105 µV

166 µV

0.0029

460 µV

±5 V

0.2478

0.6498

5 mV

298 µV

748 µV

52.3 µV

83.1 µV

0.0027

240 µV

±2.5 V

0.2478

0.6478

2.5 mV

149 µV

374 µV

26.2 µV

41.5 µV

0.0027

130 µV

±1 V

0.2478

0.6478

1.0 mV

59.6 µV

150 µV

10.5 µV

16.6 µV

0.0027

64 µV

±500 mV

0.2478

0.6478

508 µV

29.8 µV

74.8 µV

5.23 µV

8.31 µV

0.0027

42 µV

±250 mV

0.2478

0.6478

258 µV

14.9 µV

37.4 µV

2.62 µV

4.15 µV

0.0027

31 µV

±100 mV

0.2478

0.6478

108 µV

59.6 µV

150 µV

10.5 µV

16.6 µV

0.0027

64 µV

±50 mV

100

0.2478

0.6478

58 µV

2.98 µV

7.48 µV

0.52 µV

0.831 µV

0.0027

22.2 µV

±25 mV

200

0.2478

0.6478

33 µV

1.49 µV

4.8 µV

0.26 µV

0.55 µV

0.0027

21.1 µV

±20 mV

250

0.2478

0.6478

28 µV

1.19 µV

4.6 µV

0.21 µV

0.51 µV

0.0027

20.7 µV

±10 mV

500

0.2478

0.6478

18 µV

0.596 µV

3.12 µV

0.105 µV

0.247 µV

0.0027

20.4 µV

±5 mV

1000

0.2478

0.6478

13 µV

0.298 µV

2.81 µV

0.052 µV

0.312 µV

0.0027

20.4 µV

±2.5 mV

2000

0.2478

0.6478

5.1 µV

0.149 µV

2.66 µV

0.026 µV

0.296 µV

0.0027

20.4 µV

Absolute Accuracy (15 to 35 °C)

Temperatµre Drift

SCXI Module

Range

Gain

% of Reading

System Noise (peak, 3 sigma)

Typical

Max

Offset

Single Pt.

Avg

% of

Offset

4.5 kHz

22.5 kHz

4.5 kHz

22.5 kHz

Reading/°C

(V/°C)

SCXI-1120D ±1000 V rms 3

0.005

0.2848

0.6798

1.04 V

440 mV

600 mV

53 mV

100 mV

0.0059

44 mV

±500 V rms 3

0.01

0.2848

0.6798

0.52 V

220 mV

300 mV

27 mV

33 mV

0.0059

44 mV

±250 V rms 3

0.01 2

0.2848

0.6798

0.52 V

55.1 mV

211 mV

6.64 mV

22.1 mV

0.0059

22 mV

±250 V 3

0.025 2

0.2848

0.6798

260 mV

27.6 mV

106 mV

3.32 mV

11.0 mV

0.0059

11 mV

±100 V 3

0.05 2

0.2848

0.6798

104 mV

11.0 mV

42.4 mV

1.33 mV

4.42 mV

0.0059

4.4 mV

±50 V 3

0.1 2

0.2848

0.6798

52.2 mV

5.51 mV

21.2 mV

664 µV

2.21 mV

0.0059

2.2 mV

±25 V 3

0.25 2

0.2848

0.6798

21.0 mV

2.20 mV

8.48 mV

266 µV

883 µV

0.0059

900 µV

±10 V 3

0.5 2

0.2778

0.6778

10.6 mV

1.10 mV

4.24 mV

133 µV

442 µV

0.0057

460 µV

±5 V

0.2778

0.6778

5.4 mV

551 µV

2.12 mV

66.4 µV

221 µV

0.0057

240 µV

±2 V

2.5

0.2778

0.6778

2.28 mV

221 µV

848 µV

26.6 µV

88.3 µV

0.0057

108 µV

±1 V

0.2778

0.6778

1.25 mV

110 µV

424 µV

13.3 µV

44.2 µV

0.0057

64 µV

±500 mV

0.2778

0.6778

726 µV

89.1 µV

190 µV

10.7 µV

19.8 µV

0.0057

42 µV

±250 mV

0.2778

0.6778

414 µV

57.4 µV

126 µV

6.91 µV

13.1 µV

0.0057

28.8 µV

±100 mV

0.2778

0.6778

310 µV

51.6 µV

113 µV

6.22 µV

11.8 µV

0.0057

24.4 µV

±50 mV

100

0.2778

0.6778

258 µV

31.5 µV

64.3 µV

3.80 µV

6.7 µV

0.0057

22.2 µV

±25 mV

250

0.2778

0.6778

227 µV

28.7 µV

59.9 µV

3.45 µV

6.23 µV

0.0057

20.9 µV

±10 mV

500

0.2778

0.6778

216 µV

18.1 µV

36.6 µV

2.18 µV

3.81 µV

0.0057

20.4 µV

±5 mV

1000

0.2778

0.6778

211 µV

10.9 µV

21.7 µV

1.32 µV

2.26 µV

0.0057

20.2 µV

National Instruments

Tel: (512) 794-0100 • Fax: (512) 683-9300 • info@ni.com • ni.com

505

Plik z chomika:

Inne pliki z tego folderu:

Inne foldery tego chomika: