Product Overview
National Instruments SCXI-1313 Attenuator Terminal Block for SCXI-1125 - 300 Vrms, 100:1 Divider, 18-Terminal
Condition
Used, sourced from a government research facility. Visual inspection confirms normal wear consistent with prior lab use - minor surface scuffs on the off-white enclosure, mounting bracket with screws intact, multi-pin edge connector shows no chips, cracks, or corrosion. Front edge markings "MAX 300V/CAT II CHAN - CHAN" and "MAX 300V/CAT II CHAN - EARTH" are clearly legible. Part No. 187009A-01, Serial No. 124D10A, CE marked, manufactured in Hungary. Evaluation: Visual inspection only. Function testing not performed. Photos show the specific unit you will receive.
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Product Overview
National Instruments SCXI-1313 is a shielded high-voltage attenuator terminal block designed exclusively for the SCXI-1125 isolation amplifier module. Each of the 8 analog input channels carries a precision 100:1 resistive voltage divider, enabling direct connection of signals up to 300 Vrms or ±300 VDC to an NI SCXI data acquisition system. Attenuators can be bypassed per channel for low-voltage measurements. Eighteen screw terminals total - 8 pairs for analog inputs, 1 pair for chassis ground - accept wire up to 16 AWG. The terminal block mounts directly to the SCXI-1125 and operates within the NI-DAQmx software environment, including LabVIEW, LabWindows/CVI, and Measurement and Automation Explorer (MAX). Compliant with IEC 61010-1, UL 3111-1, and CAN/CSA C22.2 No. 1010.1.
Key Features
- Voltage measurement range: up to 300 Vrms or ±300 VDC per channel
- Precision 100:1 resistive voltage divider on each of 8 analog input channels
- Attenuator bypass available for low-voltage signal measurement
- 18 screw terminals: 8 analog input pairs plus 1 chassis ground pair
- Maximum wire gauge: 16 AWG; terminal spacing 0.5 cm (0.2 in.) center-to-center
- CAT II overvoltage category rating, marked on front edge
- Compatible with NI-DAQmx driver software and LabVIEW, LabWindows/CVI, MAX
- Electrical safety: IEC 61010-1, UL 3111-1, CAN/CSA C22.2 No. 1010.1
- Operating temperature: 0 to 50 °C; storage: -20 to 70 °C
- Non-condensing humidity: 10 to 90%
- CE marked; manufactured in Hungary
Applications
- Connecting high-voltage sensors or power-line signals to an SCXI-1125 module - stripping wire, routing through strain-relief, seating into screw terminals, and confirming channel configuration in MAX before a measurement run
- Acquiring bus voltage or motor drive signals at 300 Vrms in an industrial automation test stand, where the 100:1 divider brings the input within the SCXI-1125 measurement range without external signal conditioning hardware
- Bypassing the attenuator on select channels to monitor low-voltage transducer outputs on the same terminal block during a mixed-signal acquisition campaign
- Replacing a worn or missing SCXI-1313 in an existing SCXI chassis to restore a validated test fixture without redesigning the signal conditioning chain
- Lab and OEM data acquisition setups requiring compliance with IEC 61010-1 and UL 3111-1 when hazardous voltages are present on the test bench
Frequently Asked Questions
Which NI module does the SCXI-1313 connect to?
The SCXI-1313 is designed specifically for the National Instruments SCXI-1125 isolation amplifier module. It does not mate with other SCXI modules.
What chassis is required?
An NI SCXI chassis or a PXI/SCXI combination chassis is required. The SCXI-1313 installs on the front of the SCXI-1125, which occupies a chassis slot.
How does the SCXI-1313 differ from the SCXI-1313A?
The SCXI-1313 supports up to 300 Vrms or ±300 VDC per channel. The SCXI-1313A is rated to 150 Vrms or ±150 VDC and adds a calibration EEPROM that stores gain-correction constants for the attenuator circuitry. In NI-DAQmx and MAX software, both variants share the "SCXI-1313" designator.
Is a safety earth-ground connection required?
Yes. When hazardous voltages are present - defined as 30 Vrms or higher, 42.4 Vpeak or higher, or 60 VDC or higher - NI specifies that a safety earth-ground wire must be connected to the terminal block's ground lug to maintain compliance with UL 3111-1 and IEC 61010-1.
Does this unit include the SCXI-1125 module or chassis?
Not included. This listing is for the SCXI-1313 terminal block only.
High-voltage measurement used to mean a rack full of isolation transformers, attenuator boxes, and hand-built wiring harnesses. The SCXI-1313 collapsed all of that into a single shielded terminal block that snaps onto the front of an SCXI-1125 - government lab provenance and all. Whoever picks this up inherits a direct path to 300-volt data acquisition that still works exactly as the engineers who specified it intended.
