- 1 mHz to 102 kHz frequency range
- 1 nV to 1 V full-scale sensitivity
- Time constants from 10 µs to 3 ks
- > 120 dB dynamic reserve
- Automatic adjustment
- Multiple-harmonic measurement
- FFT spectral analysis
- 5.6 inch color TFT-LCD screen, single or dual display
- Support remote control, embedded a free LabVIEW program
Maxwellon TW4803 Digital Lock-in Amplifier provides an excellent performance within its bandwidth from 1 mHz to 102 kHz. With the advantage of the latest digital signal processing technology and high-precision 24-bit ADC, TW4803 can easily detect the phase and the magnitude of weak signals overwhelmed by various large noises. The performance of TW4803 is as good as other lock-in amplifiers brands, even better in some certain parameters, such as measurement accuracy, SNR, dynamic reserve. Otherwise, TW4803 integrates some special functions like multiple harmonic measurement and FFT, which meets the needs of scientific research and industrial application well.
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 | > 120 dB |
Gain Accuracy | 0.2% typ, 1% max |
Voltage Noise | 5 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 front panel, and TTL sync output on rear panel |
General Specifications | |
Interface | RS-232 to USB interface, and IEEE-488 interface (optional). |
CH1 and CH2 Outputs | • Function: output X, Y, R, θ • Output voltage: ±10 V full scale, 30 mA max output current • Update rate: 312.5 kHz |
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, polar plot and strip chart |
Power Requirement | • Voltage: 220 – 240 VAC, 100 – 120 VAC (optional) • Frequency: 50/60 Hz • Power: 30 W |
Dimension | 448 (W) × 148 (H) × 513 (D) mm (with feet) |
Weight | 11 kg |
Ordering Information
Part No. | Name | Description |
TW4803 | Digital Lock-in Amplifier | 1 mHz to 102 kHz, 1 nV to 1 V full-scale sensitivity |
