Stanford Research Systems SR830 Digital Lock-In Amplifier | 1 mHz - 102.4 kHz

The Stanford Research Systems SR830 lock-in amplifier operates over a frequency range of 1 mHz - 102.4 kHz and possesses a dynamic reserve of >100 dB. Stanford Research Systems SR830 lock-in amps harness the power of digital signal processing (DSP) to measure and display the magnitude and phase of signals. The SR830 has differential inputs with 6 nV/√Hz input noise; input impedance is 10 MΩ, while the minimum input sensitivity is 2 nV. While an analog lock-in amplifier uses a demodulator to integrate the input signal with the reference signal, the digital processing technology in the SR830 demodulates by sampling the input signal with a high-precision A/D converter, allowing for 100 dB of unfiltered dynamic reserve. DSP also provides digital filtering and digital phase-shifting to streamline measurements.

Product Info

Frequency Range	0.001 Hz to 102.4 kHz
Dynamic reserve	>100 dB (without prefilters)
Voltage inputs	Single-ended or differential
Sensitivity	2 nV to 1V
Current input	10⁶ or 10⁸ V/A
Input impedance	Voltage: 10MΩ+25 pF, AC or DC coupled Current: 1 kΩ to virtual ground
Gain accuracy	±1% (±0.2% typ.)
Noise (typ.)	6 nV/√Hz at 1 kHz 0.13 pA/√Hz at 1 kHz (10⁶ V/A) 0.013 pA/√Hz at 100Hz (10⁸ V/A)
Line filters	50/60Hz and 100/120Hz (Q=4 )
CMRR	100 dB to 10 kHz, decreasing by 6 dB/oct above 10 kHz
Dynamic reserve	>100 dB (without prefilters)
Stability	<5 ppm/°C
Reference input	TTL or sine (400mVpp min.)
Input impedance	1MΩ, 25 pF
Phase resolution	0.01° front panel, 0.008° through computer interfaces
Absolute phase error	<1°
Relative phase error	<0.001°
Orthogonality	90° ± 0.001°
Phase noise	Internal ref. : Synthesized, <0.0001° rms at 1 kHz External ref. : 0.005° rms at 1 kHz (100ms time constant, 12 dB/oct)
Phase drift	<0.01°/°C below 10 kHz <0.1°/°C above 10 kHz
Harmonic detection	2F, 3F, ... nF to 102 kHz (n < 19,999)
Acquisition time	(2 cycles+5ms) or 40ms, whichever is larger
Stability	Digital outputs and display: no drift Analog outputs: <5 ppm/°C for all dynamic reserve settings
Harmonic rejection	–90 dB
Time constants	10µs to 30 ks (6, 12, 18, 24 dB/oct rolloff). Synchronous filters available below 200Hz