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Product Background

SCXI (Signal‑Conditioning eXtensions for Instrumentation) is NI’s legacy modular signal‑conditioning platform, widely used to bring noisy, high‑voltage field sensor signals into desktop / PXI DAQ measurement boards. The SCXI system separates signal conditioning from analog‑to‑digital conversion: SCXI modules handle amplification, attenuation and filtering, while external DAQ hardware performs A/D conversion.

The SCXI‑1104C belongs to the SCXI‑1104 family. The base SCXI‑1104 has a 2 Hz low‑pass filter for slow‑changing DC‑like signals; the ‑1104C variant upgrades to 10 kHz filter for dynamic, time‑varying medium‑voltage measurements, while keeping all other hardware identical.

NI SCXI‑1104C 32‑Channel Medium‑Voltage Differential Voltage Input Signal‑Conditioning Module

It accepts medium‑voltage field signals up to ±60 VDC / ±42 VAC peak / 30 VAC RMS, integrates per‑channel attenuator and amplifier, and multiplexes all 32 differential channels down to one output channel to feed a DAQ device.

This product has reached EOL (End‑of‑Life). Original factory new stock is no longer produced. Market supply is limited to used, surplus and refurbished spare units. It is controlled by NI‑DAQmx drivers and compatible with LabVIEW, LabWindows/CVI and TestStand software suitesNI.

NI SCXI‑1104C 32‑Channel Medium‑Voltage Differential Voltage Input Signal‑Conditioning Module

Main Functions

1. 32‑channel differential medium‑voltage signal conditioning Provides 32 independent differential analog input channels for medium‑voltage measurement. Each channel has its own attenuation stage and instrumentation amplifier, supporting input range up to ±60 VDC. Differential architecture delivers high common‑mode rejection to suppress ground‑loop noise in industrial field environments.
2. Per‑channel fixed 10 kHz three‑pole low‑pass filtering Every input channel carries an independent 3‑pole low‑pass filter with fixed 10 kHz cutoff frequency. It rejects high‑frequency interference and preserves dynamic AC signal content, differentiating SCXI‑1104C from the slower 2 Hz‑filter SCXI‑1104 base model.More products: plcva.com
3. Multiplexing for DAQ hardware interface All 32 differential channels are internally multiplexed to a single analog output. This single output connects via the SCXIbus or ribbon cable to an external NI DAQ board (PCI / PXI DAQ device). One DAQ input channel can therefore handle up to 32 conditioned measurement points, greatly expanding system channel density.
4. On‑board non‑volatile calibration storage Factory gain‑offset calibration constants are stored in on‑board non‑volatile memory. NI‑DAQmx drivers automatically apply correction values during measurement. Annual external calibration is recommended to maintain long‑term accuracy under temperature drift.
5. System‑level chassis integration Installs into any standard SCXI chassis (SCXI‑1000, SCXI‑1001, SCXI‑1002 etc.). Requires mating front‑mount terminal block (e.g. SCXI‑1349) for field‑wiring access. Multi‑chassis expansion is supported with accessory adapters such as SCXI‑1346.

Note: The module performs signal conditioning only; it contains no built‑in ADC. Analog‑to‑digital conversion must be completed by an external DAQ acquisition board.

NI SCXI‑1104C 32‑Channel Medium‑Voltage Differential Voltage Input Signal‑Conditioning Module

Typical Applications

1. Multi‑channel industrial voltage monitoring Multi‑point DC‑bus voltage monitoring, power‑supply validation, battery‑pack voltage sampling for test benches. Ideal for systems requiring high‑channel‑count medium‑voltage acquisition.
2. Dynamic signal measurement with moderate bandwidth Capturing time‑varying AC‑coupled and DC‑coupled industrial signals within the 10 kHz bandwidth, including vibration transducer outputs, sensor analog outputs, transient voltage recording.
3. Legacy ATE (Automatic Test Equipment) Retrofit and maintenance of existing SCXI‑based automated test systems for aerospace, defence and industrial electronics. Used to replace failed modules without redesigning the whole measurement cabinet.
4. Laboratory and research‑oriented data‑acquisition systems Multi‑channel sensor data logging in university labs and research institutes, for structural test, power‑electronics experiment setups.
5. Factory‑floor signal‑conditioning front‑end Cabinet‑mounted remote signal‑conditioning for noisy factory environments, isolating field‑side medium‑voltage signals before feeding them to measurement instruments.

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