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General description of the
used STANFORD RESEARCH SYSTEMS SR830
for sale.
The Stanford Research SR830 DSP Lock-In Amplifier is used to detect and measure very small AC signals - all the way down to a few nanovolts. Accurate measurements may be made even when the small signal is obscured by noise sources many thousands of times larger. Specifications. SIGNAL CHANNEL; Voltage Inputs: Single-ended (A) or differential (A-B). Current Input: 106 or 108 Volts/Amp. Full Scale Sensitivity: 2 nV to 1 V in a 1-2-5-10 sequence (expand off). Input Impedance Voltage: 10 M-ohm +25 pF, AC or DC coupled. Input Impedance Current: 1 k-ohm to virtual ground. Gain Accuracy: ±1% from 20°C to 30°C (notch filters off), ±0.2 % Typical. Input Noise: 6 nV/sqrt Hz at 1 kHz (typical). Signal Filters: 60 (50) Hz and 120(100) Hz notch filters (Q=4). CMRR: 100 dB to10 kHz (DC Coupled), decreasing by 6db/octave above 10 kHz. REFERENCE CHANNEL; Frequency Range: 1 mHz to 102 kHz. Reference Input: TTL (rising or falling edge) or Sine, Sine input is1 M-ohm, AC coupled (>1 Hz). 400 mV pk-pk minimum signal. Phase Resolution: 0.01°. Absolute Phase Error: <1°. Relative Phase Error: <0.01°. Orthogonality: 90° ± 0.001°. Phase Noise: External synthesized reference: 0.005° rms at 1 kHz, 100 ms, 12 dB/oct. Internal reference: crystal synthesized, <0.0001° rms at 1 kHz. DEMODULATOR; Zero Stability: Digital displays have no zero drift on all dynamic reserves, Analog outputs: <5 ppm/°C for all dynamic reserves. Time Constants: 10 µs to 30 s (reference > 200 Hz). 6, 12, 18, 24 dB/oct rolloff, up to 30000 s (reference < 200 Hz). 6, 12, 18, 24 dB/oct rolloff, Synchronous filtering available below 200 Hz. Harmonic Rejection: -80 dB. INTERNAL OSCILLATOR; Frequency: 1 mHz to 102 kHz. Frequency Accuracy: 25 ppm + 30 µHz. Frequency Resolution: 4 1/2 digits or 0.1 mHz, whichever is greater. Distortion f<10 kHz, below -80 dBc. f>10 kHz, below -70 dBc.1 Vrms amplitude. Output Impedance: 50 ohm. Amplitude: 4 mVrms to 5 Vrms (into a high impedance load) with 2 mV resolution, (2 mVrms to 2.5 Vrms into 50 ohm load). Amplitude Accuracy: 1%. Amplitude Stability: 50 ppm/°C. Outputs: Sine output on front pane, TTL sync output on rear panel, When using an external reference, both outputs are phase locked to the external reference. DISPLAYS; Channel 1 and Channel 2: 4 1/2 digit LED display with 40 segment LED bar graph. Interfaces: IEEE-488 and RS232 interfaces standard.
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