-1 mHz to 3 MHz 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
Maxwellon TW4802 Digital Lock-in Amplifier provides an excellent performance within its bandwidth from 1 mHz to 3 MHz. With the advantage of the latest digital signal processing technology and high- speed 16-bit ADC, TW4802 can easily detect the phase and the magnitude of weak signals overwhelmed by various large noise. The performance of TW4802 is as good as other lock-in amplifiers brands, even better in some certain parameters, such as measurement accuracy, SNR, dynamic reserve. Otherwise, TW4802 integrates some special functions like multiple harmonic measurement, 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 | > 100 dB |
Gain Accuracy | 0.2% typ, 1% max |
Voltage Noise | 3 nV/√Hz at 997 Hz |
Current Noise | • 7 fA/√Hz at 97 Hz • 10 fA/√Hz at 997 Hz |
Line Filters | 50/60 Hz and 100/120 Hz |
Gounding | BNC shield can be grounded or floated via 1 kΩ to ground |
Reference Channel | |
Input | • Frequency range: 1 mHz to 3 MHz • 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.) 0.005°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 3 MHz (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 3 MHz • Accuracy: 2 ppm + 10 µHz • Resolution: 1 mHz |
Distortion | • -80 dBc (f < 10 kHz) • -70 dBc (f > 10 kHz) |
Amplitude | 0.001 to 10 Vpp |
Accuracy | 1% |
Stability | 50 ppm/℃ |
Output | Sine output on rear panel, and TTL sync output on rear panel |
General Specifications | |
Interface | 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 | Large numeric readout, bar graph, polar plot and strip chart |
Power Requirement | • Voltage: 220 – 240 VAC, 100 – 120 VAC (optional) • Frequency: 50/60 Hz • Power: 40 W |
Dimension | • 473 (W) × 160 (H) × 490 (D) mm (with feet) • 473 (W) × 147 (H) × 490 (D) mm (without feet) |
Weight | 12 kg |
Ordering Information
Part No. | Name | Description |
TW4802 | Digital Lock-in Amplifier | 1 mHz to 3 MHz, 1 nV to 1 V full-scale sensitivity |
