DXA-002 120kHz Small-sized DSP Lock-in Amplifier
Input Channel
DXA-002 detects an input signal in a single-ended mode or a differential voltage mode. With an ultra low-noise pre-amplifier, the input noise is as low as 9 nV/√Hz@997 Hz. The input impedance is 10 MΩ and the full-scale input voltage sensitivity ranges from 1 nV to 1 V. Besides, DXA-002 can be used for current measurement with gains of 10^6 or 10^8 V/A. Two line filters (50/60 Hz and 100/120 Hz) are designed to eliminate power frequency interference. A programmable gain amplifier is used to adjust the dynamic reserve of the system, so that DXA-002 can keep a high dynamic reserve of 120 dB.
Reference Channel
The reference signal can work in external mode or internal mode. In internal mode, a precise and stable internal oscillator generates a sine wave as an internal reference that is multiplied by the input signal. This internal signal is without any phase noise. With the digital phase-shifting technique, the phase resolution of the reference signal is 0.01 deg. DXA-002 can work at any fixed frequency from 50 mHz to 120 kHz in this mode. In external mode, the reference signal can be a sine wave or a TTL pulse or a square wave. The rising or falling edge of the external reference signal triggers the Phase Lock Loop (PLL) to lock the external signal. Based on the frequency of the reference signal, the DXA-002 can detect the harmonics of the input signal. The maximum harmonic signal frequency can reach 32,767 times the fundamental frequency, and the maximum harmonic frequency cannot exceed the maximum operating frequency of the instrument by 120 kHz.
Display
DXA-002 has a 3.5-inch 320 x 240 color TFT-LCD. The measurement results of DXA-002, such as X, Y, R, and θ, are shown in numerical form.
Internal Oscillator
The internal oscillator of DXA-002 generates a low distortion (–80 dBc) sine reference signal varying from 50 mHz to 120 kHz, which has a high frequency resolution of 1 mHz. The frequency and amplitude of the reference signal can be set by using the front panel of DXA-002 or the communication interface. When DXA-002 is set in the external reference mode, the internal reference signal is phase-locked with the external reference signal.
Signal Generator
DXA-002 uses a high precision digital-to-analog converter (DAC) to output a sine wave signal at the same frequency as the internal reference signal. The amplitude and phase of the output sine wave can be set through the DXA-002's display, where the maximum amplitude of the sine wave is 1 Vrms.
Manual Operation
All functions of DXA-002 can be selected through the knobs and left and right keys on the interface, and the parameters of the response can be set directly through the Settings button in the right bar. This instrument is equipped with the corresponding free LabVIEW program, which can effectively use all the test functions of DXA-002, including setting the reasonable control parameters of the instrument and reading and saving the measured data of the instrument. This makes DXA-002 easy to use in complex scientific experiments. On the LabVIEW interface, users can see all control commands and instrument feedback responses.
Signal Channel
Voltage input Mode Single-ended or Differential
Full-scale Sensitivity 1 nV to 1 V in a 1-2-5 sequence
Current input 106 or 108 V/A
Impedance
Voltage 10 MΩ//25 pF,Ac or DC coupling
Current 1 kΩ to virtual ground
C.M.R.R >100 dB (within 100kHz), >90dB (beyond 100kHz)
Dynamic reserve >100 dB
Gain accuracy 0.2% typ, 1% max
Voltage Noise
997Hz 9 nV/√Hz
Current Noise
97 Hz 0.13 pA/√ Hz
997Hz 0.14 pA/√ Hz
Line filters 50/60 Hz and 100/120 Hz
Grounding BNC (A/I, B)shield can be grounded or floated via 10 kΩ to ground
Stability 2ppm/℃
Reference Channel
Input
Frequency range 50 mHz to 120 kHz
Reference input TTL or Sine
Input impedance 1 MΩ//25pF
Phase
Resolution 0.01°
Absolute phase error <1°
Relative phase error <0.01°
Phase noise
Internal ref. Synthesized, <0.0005°rms at1 kHz
External ref. 0.01°rms at 1 kHz (100 ms time constant, 12 dB/oct)
Drift
Below 10 kHz <0.01°/℃
Above 10 kHz <0.1°/℃
Acquisition time
Internal Ref. Instantaneous acquisition
External Ref. (10 cycles + 40 ms) or 100 ms
Display
Screen 3.5 inch, 640×480 TFT Color LCD
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, XY plot and polar plot
Color style yellow, green
AUX Inputs and Outputs
CH1 and CH2 Outputs
Function Output X, Y, R, θ and harmonic
Voltage ±10 V
Drive current ±30mA max
Interfaces
RS-232 to USB RS-232 to USB2.0 interface
RS-232 interface Standard 9-pin RS-232 male socket
IEEE-488 interface(optional)
General
Power requirements
Voltage 220~240 V AC
Frequency 50/60 Hz
Power Standard 10W, Max. 20W
Power supply rejection 70dB@1MHz
Weight 3.2 KG
Dimensions
Width 259 mm
Depth 320 mm
Height
With feet 115 mm
Without feet 102 mm
You may also like
