SCXI 8-Channel Isolated Analog Input Modules
NI SCXI-1125, NI SCXI-1120, NI SCXI-1120D
• 8 channels
SCXI-1120, SCXI 1120D
• 333 kS/s maximum sampling rate
• Gain and lowpass filter settings
per channel
• Up to 300 Vrms working isolation
per channel
• Signal inputs from ±2.5 mV
to ±1000 VDC with TBX-1316
• NI-DAQ driver software simplifies
configuration, measurement and scaling
• Jumper selectable filter per channel
• 4 Hz and 10 kHz filter (SCXI-1120)
• 4.5 kHz and 22.5 kHz (SCXI-1120D)
• 250 Vrms working isolation per channel
Operating Systems
• Windows 2000/NT/XP
Recommended Software
• LabVIEW
• LabWindows/CVI
• Measurement Studio
• VI Logger
SCXI-1125
• Programmable gain and filter settings
• 300 Vrms working isolation per channel,
Driver Software
• NI-DAQ 7
Calibration Certificate Included
See page 21.
Overview
SCXI-1120, SCXI-1120D
The National Instruments SCXI-1125, SCXI-1120, and SCXI-1120D The analog inputs of the NI-1120/D consist of eight isolation
are 8-channel isolated analog input modules. These modules share a amplifiers. You can configure each amplifier using jumpers for input
common architecture, providing 250 to 300 Vrms of working isolation ranges from ±2.5 mV to ±5 V (SCXI-1120) or ±5 mV to ±10 V
and lowpass filtering for each analog input channel. This architecture (SCXI-1120D). With the SCXI-1327 high-voltage attenuator terminal
is ideal for amplification and isolation of millivolt, volt, 0 to 20 mA, block, the input range is extended to ±250 V. With the TBX-1316, the
4 to 20 mA, and thermocouple signals. Each module can multiplex input range is extended to ±1000 VDC (680 Vrms). Each channel also
these eight channels into a single channel of the DAQ device, and you includes a lowpass filter that is jumper configurable for 4 Hz or 10 kHz
can add modules to increase channel count. These modules also offer (SCXI-1120), or for 4.5 or 22.5 kHz (SCXI-1120D). Each channel is
parallel mode operation for increased scanning rates.
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 Vrms of operational isolation.
Analog Input
SCXI-1125
The analog inputs of the NI SCXI-1125 consist of eight
programmable isolation amplifiers. You can program each channel Cold-Junction Compensation
independently for input ranges from ±2.5 mV to ±5 V. With the Each of these modules can read the cold-junction sensor from the
SCXI-1313 high-voltage attenuator terminal block, the input range is SCXI-1320, SCXI-1321, SCXI-1327, SCXI-1328, and TBX-1328
extended to ±300 V. With the TBX-1316, the input range is extended terminal blocks. The SCXI-1125 can scan the sensor along with other
to ±1000 VDC (680 Vrms). Each channel also includes a programmatic channels, but the SCXI-1120/D must read the cold-junction sensor
lowpass filter that you can configure for 4 Hz or 10 kHz. With the as a separate analog input operation. This is commonly done once
SCXI-1125 you can perform random scanning meaning you can before the start of a continuous acquisition.
select only the channels from which you want to acquire data as well
Module
±2.5 mV
±5 mV to ±5 V
±10 V
±1000 V 0 to 20 mA Thermocouple
as scan channels in any order. Each channel is individually isolated
with a working common-mode voltage of 300 Vrms between channels
or channel to earth. In addition, the SCXI-1125 is CE certified as
double insulated, Category II, for 300 Vrms of operational isolation.
SCXI-1125
SCXI-1120
SCXI-1120D
✓
✓
–
✓
✓
✓
–
–
✓
✓*
✓
✓
✓
✓
✓
✓
✓
✓
*Using attenuating terminal block.
Table 1. Module Compatibility
296 National Instruments • Tel: (800) 433-3488 • Fax: (512) 683-9300 • info@ni.com • ni.com
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