Signal amplifier DXA-203

currentvoltagedata acquisition

Overview

The DXA-203 is a high-performance digital lock-in amplifier covering DC to 250 kHz, designed for precise synchronous detection, low-noise measurement and multi-channel demodulation. It integrates high dynamic reserve, flexible I/O and comprehensive analysis functions for laboratory and instrumentation applications.

Key features

• Frequency range from DC to 250 kHz with high frequency accuracy and resolution.
• Extremely low input voltage noise and wide full-scale sensitivity (from nV to Vrms level).
• Eight demodulators for synchronized multi-channel measurements and broad measurement bandwidth.
• Built-in dual oscillators, synchronous filters and selectable filter slopes for flexible signal processing.
• Extensive auxiliary I/O (multi-channel analog in/out), driving capability, and multiple communication interfaces (USB, Ethernet, RS-232, GPIB, WiFi).

PC Software

The DXA-203 provides professional PC software for configuring each demodulator, input and output channel via schematic diagrams or control panels, with clear numerical displays and real-time waveform display. Measurement results can be saved and exported as CSV files. APIs are supported for Python, MATLAB and LabVIEW.

Technical specifications

• Input Signal Channel: Input mode — Voltage: single-ended or differential; Current: single-ended.
• Full-scale sensitivity: 1 nV to 5 Vrms.
• Range levels: 2 mV to 5 V (total 7 levels).
• Input coupling: DC or AC.
• Input impedance (voltage): 10 MΩ || 25 pF. Input impedance (current): 100 Ω or 1 kΩ.
• Input shield grounding: Grounding or 10 kΩ floating.
• Dynamic reserve: >130 dB.
• Gain accuracy: 0.5% typical, 1% max.
• Input voltage noise: 3.5 nV/√Hz (f ≥ 1 kHz); 2.5 nV/√Hz (f ≥ 10 kHz).
• Input current noise: 20 fA/√Hz (f = 97 Hz).
• ADC resolution (input): 24 bit.
• Output Signal Channel: Frequency range: DC – 250 kHz. Frequency accuracy: 2 ppm + 1 μHz. Frequency resolution: 1 nHz.
• Sine amplitude: 0.1 μVrms to 5 Vrms. Amplitude accuracy: 0.5% typical, 2% max. Amplitude resolution: 0.1 μVrms.
• Driving current: ±80 mA max. Output impedance: 50 Ω. Temperature stability: <200 ppm/°C.
• Adjustable DC offset: -5 VDC to 5 VDC.
• Synchronous output: 3.3 V TTL/CMOS level (output impedance 50 Ω). Additional modulation outputs: AM / FM / PM. DAC parameter (signal output): 16 bit, 32 MSPS.
• Reference Signal Channel: Number of reference channels: 2. Reference frequency range: 10 μHz – 250 kHz. Supported waveforms: square or sine. Reference input impedance: 1 MΩ.
• Reference levels (square): VIH between 3 V and 5 V; VIL between -0.1 V and 0.5 V. Sine reference: sine frequency > 1 Hz; 300 mV < Vpp < 10 V.
• Phase: Resolution: 1.0 μdeg. Phase error: ±0.5° typical, ±1° max. Temperature drift: <200 ppm/°C. Harmonic detection: 1–10000F (nF < 1.5 MHz).
• Acquisition time: Internal reference: instantaneous acquisition. External reference: 10 or 100 signal cycles.
• Oscillator: Number: 2. Accuracy: 0.3 ppm. Temperature stability: 0.5 ppm/°C. Aging rate: <1 ppm/year. Phase noise: -145 dBc/Hz (@1 kHz).
• Demodulator: Number: 8. Demodulator bit width: 64 bit. Time constant range: 100 ns – 3 ks. Measurement bandwidth: 50 μHz – 1.6 MHz. Filter slope options: 6, 12, 18, 24, 30, 36, 42, 48 dB/oct. Synchronous filter effective <1000 Hz.
• Auxiliary Inputs / Outputs: AUX Input — 4-channel, amplitude ±10 V with 0.1 mV resolution, input impedance 1 MΩ, ADC: 16 bit, 150 kSPS. AUX Output — 4-channel, amplitude ±10 V with 0.1 mV resolution, driving current ±30 mA max, DAC: 16 bit, 500 kSPS.
• Communication interfaces: RS-232 (DB-9 female), USB 2.0 (480 Mbps), Ethernet RJ45 (1000 Mbps), WiFi wireless network interface, GPIB (IEEE-488.2).
• Power & Mechanical: Power voltage: 220–240 V AC (100–120 V AC optional). Power consumption: 50 W typical, 70 W max. Power noise suppression: 70 dB @ 1 MHz. Dimensions: 448 mm × 532 mm × 148 mm. Weight: 12 kg.