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This Stanford Research Systems SR530 Dual Phase Lock-In Amplifier is in used, very good cosmetic condition and has been tested and confirmed working. The unit carries a current Electrical Safety Test (PAT) pass label.

The SR530 is fitted with both available options:
• Option 01 – GPIB (IEEE-488) Interface
• Option 02 – Internal Voltage-Controlled Oscillator

RS-232 is standard and also present on this unit. The rear panel includes 4× ADC analog inputs (X1–X4), 2× DAC analog outputs (X5–X6 / Ratio), a Signal Monitor output, and a Pre-Amp connector port.

This listing includes the SR530 unit only.

The Stanford Research Systems SR530 is a dual-phase analog lock-in amplifier designed to measure AC signals as small as nanovolts in the presence of much larger noise levels. It is widely used in physics, chemistry, and engineering research laboratories for sensitive signal recovery applications.

The SR530 uses a precision sine-wave multiplier rather than a square-wave demodulator, making it inherently free of spurious harmonic responses. It offers dual-phase (X and Y) simultaneous outputs, single-ended or true differential voltage inputs, and a current input with 10⁶ V/A transimpedance gain. Two stages of time constants provide exceptional filtering flexibility, and auto-tracking bandpass and line-notch filters further suppress unwanted noise.

Key features include:
- Sine-wave multiplier for harmonic-free detection
- Dual-phase simultaneous X and Y outputs with analog panel meters and 4-digit LCD displays
- Auto-tracking bandpass filter (Q=5), line notch filter and 2× line notch filter
- Four rear-panel ADC inputs and two DAC outputs (±10.24 V, 2.5 mV resolution)
- Built-in ratio feature (output divided by denominator ADC input)
- RS-232 interface standard; GPIB (IEEE-488) optional
- Optional internal voltage-controlled oscillator (1 Hz to 100 kHz)

Frequency Range: 0.5 Hz to 100 kHz
Input Noise Voltage: 7 nV/√Hz at 1 kHz (typical)
Input Noise Current: 0.13 pA/√Hz at 1 kHz (typical)
Full Scale Sensitivity (Voltage): 100 nV to 500 mV RMS (10 nV with ×10 expand)
Full Scale Sensitivity (Current): 100 fA to 500 nA RMS
Dynamic Reserve: up to 80 dB
Time Constants (Pre): 1 ms to 100 s
Time Constants (Post): 0, 0.1, 1.0 s
Phase Resolution: 0.025°
Gain Accuracy: 1% (2 Hz to 100 kHz)
Common Mode Rejection: 100 dB (DC to 1 kHz)
Power: 100/120/220/240 VAC, 50/60 Hz, 35 W max
Dimensions: 17" × 17" × 5.25"
Weight: 16 lbs

Stanford Research datasheet: Download PDF