- 2 independent input channels and 2 signal generators
- 1 mHz to 102 kHz frequency range
- 1 nV to 1 V full-scale sensitivity
- Time constants from 10 µs to 3 ks
- > 100 dB dynamic reserve
- Automatic adjustment
- Multiple-harmonic measurement
- 5.6 inch color TFT-LCD screen, single or dual display
- Support remote control, embedded a free LabVIEW program
- Adopt high-precision 24-bit ADC and FPGA+ARM digital platform architecture, better than DSP architecture
Maxwellon TW4803D Digital Lock-in Amplifier provides an excellent performance within its bandwidth from 1 mHz to 102 kHz. More importantly, TW4803D has dual independent input channels and dual independent high precision signal generators. Each input channel and signal generator can be used independently which means that the TW4803D is equivalent to two traditional lock-in amplifiers. Moreover, due to the twin symmetrical design, the two independent input channels and signal generators have ultra-high synchronicity, which meets the measurement requirements demanding extremely high synchronization.
Signal Channel | |
Voltage Input Mode | Single-ended or Differential |
Full-scale Sensitivity | 1 nV to 1 V in a 1-2-5 sequence 1 fA to 1 µA |
Current Input | 106 or 108 V/A |
Impedance | • Voltage: 10 MΩ // 25 pF, AC or DC coupled • Current: 1 kΩ to virtual ground |
C.M.R.R | > 100 dB to 10 kHz, decreasing by 6 dB/oct |
Dynamic Reserve | > 100 dB |
Gain Accuracy | 0.2% typ, 1% max |
Voltage Noise | 6 nV/√Hz at 997 Hz |
Current Noise | • 15 fA/√Hz at 97 Hz • 13 fA/√Hz at 997 Hz |
Line Filters | 50/60 Hz and 100/120 Hz |
Gounding | BNC shield can be grounded or floated via 10 kΩ to ground |
Reference Channel | |
Input | • Frequency range: 1 mHz to 102 kHz • Reference input: TTL or Sine • Input impedance: 1 MΩ//25 pF |
Phase | • Resolution: 0.01° • Absolute phase error: < 1° • Relative phase error: < 0.01° • Orthogonality: 90° ± 0.001° • Phase noise: (Internal ref.) Synthesized, <0.0001°rms at 1 kHz; (External ref.) 0.001°rms at 1 kHz (100 ms time constant, 12 dB/oct) • Drift: <0.01°/℃ below 10 kHz, <0.1°/℃ above 10 kHz |
Harmonic Detection | 2F, 3F, …nF to 102 kHz (n<32767) |
Acquisition Time | • Internal ref.: instantaneous acquisition • External ref.: (2 cycles + 5 ms) or 40 ms, whichever is larger |
Demodulator | |
Stability | • Digital output: no zero drift on all setting • Display: no zero drift on all setting • Analog output: <5 ppm/℃ for all dynamic reserve settings |
Harmonic Rejection | -90 dB |
Time Constant | • 10 µs to 3 ks (<200 Hz) • 10 µs to 30 s (>200 Hz) (6, 12, 18, 24 dB/oct rolloff) |
Synchronous Filters | Available below 200 Hz (18, 24 dB/oct rolloff) |
Internal Oscillator | |
Frequency | • Range: 1 mHz to 102 kHz • Accuracy: 2 ppm + 10 µHz • Resolution: 1 mHz |
Distortion | • -80 dBc (f < 10 kHz) • -70 dBc (f > 10 kHz) |
Amplitude | 0.001 to 5 Vrms |
Accuracy | 1% |
Stability | 50 ppm/℃ |
Output | Sine output on rear panel, and TTL sync output on rear panel |
General Specifications | |
nterface | USB2.0 and RS-232 interface |
CH1 and CH2 Outputs | • Function: output X, Y, R, θ • Output voltage: ±10 V full scale, 30 mA max output current |
Screen | 5.6 inch, 640×480 TFT |
Screen Format | Single or dual display |
Display Quantities | Each display shows one trace, traces can be defined as X,Y,R,θ |
Display Types | Numerical form, bar graph and strip chart |
Power Requirement | • Voltage: 220 – 240 VAC, 100 – 120 VAC (optional) • Frequency: 50/60 Hz • Power: 50 W |
Dimension | • 473 (W) × 160 (H) × 490 (D) mm (with feet) • 473 (W) × 147 (H) × 490 (D) mm (without feet) |
Weight | 11 kg |
Ordering Information
Part No. | Name | Description |
TW4803D | Digital Lock-in Amplifier | 1 mHz to 102 kHz, 1 nV to 1 V full-scale sensitivity, dual independent input channels and signal generators |
