SRS
SR510 & SR530 – 100 kHz lock-in amplifiers
Overview
The SR510 and SR530 are analog lock-in amplifiers which can measure AC signals as small as nanovolts in the presence of much larger noise levels. Both the single phase SR510 and the dual phase SR530 have low-noise voltage and current inputs, high dynamic reserve, two stages of time constants, and an internal oscillator.
Feature
• 0.5 Hz to 100 kHz frequency range
• Current and voltage inputs
• Up to 80 dB dynamic reserve
• Tracking band-pass & line filters
• Internal reference oscillator
• Four ADC inputs, two DAC outputs
• GPIB interface
• RS-232 interface
Technical Specifications
Signal Channel
Inputs
Voltage: Single-ended or differential
Current: 106 V/A
Impedance
Voltage: 100 M? + 25 pF, AC coupled
Current: 1 k? to virtual ground
Full-scale sensitivity
Voltage: 100 nV to 500 mV
Current: 100 fA to 0.5 ?A
Maximum inputs
Voltage: 100 VDC, 10 VAC damage threshold, 2 Vpp saturation
Current: 10 ?A damage threshold, 1 ?App saturation
Noise
Voltage: 7 nV/?Hz at 1 kHz (typ.)
Current: 0.13 pA/?Hz at 1 kHz (typ.)
Common Mode
Range: 1 Vp
Rejection: 100 dB (DC to 1 kHz, degrades by 6 dB/oct above 1 kHz)
Gain accuracy: 1 % (2 Hz to 100 kHz)
Gain stability: 200 ppm/?C
Signal filters: 60 Hz notch, -50 dB (Q=10, adjustable from 45 to 65 Hz)
120 Hz notch, -50 dB (Q=10, adjustable from 100 to 130 Hz)
Tracking band pass (Q=5). Filter adds 20 dB to dynamic reserve.
Dynamic reserve: LOW (20 dB), 5 ppm/?C (1 ?V to 500 mV sensitivity)
NORM (40 dB), 50 ppm/?C (100 nV to 50 mV sensitivity)
HIGH (60 dB), 500 ppm/?C (100 nV to 5 mV sensitivity)
Reference Channel
Frequency: 0.5 Hz to 100 kHz
Input impedance: 1 M?, AC coupled
Trigger
Sine: 100 mV minimum, 1 Vrms nominal
Pulse: ?1 V, 1 ?s minimum width
Mode: Fundamental or 2nd harmonic (2f)
Acquisition time: 25 s (1 Hz ref.), 6 s (10 Hz ref.), 2 s (10 kHz ref.)
Slew rate: 1 decade per 10 s at 1 kHz
Phase control: 90? shifts, fine shifts in 0.025? steps
Phase noise: 0.01? rms at 1 kHz (100 ms, 12 dB/oct rolloff time constant)
Phase drift: 0.1?/?C
Phase error: Less than 1? above 10 Hz
Orthogonality*: 90? ? 1?
Demodulator
Stability: 5 ppm/?C (LOW dynamic reserve)
50 ppm/?C (NORM dynamic reserve)
500 ppm/?C (HIGH dynamic reserve)
Time constants:
Pre: 1 ms to 100 s (6 dB/octave)
Post: 1 s, 0.1 s, none (6 dB/octave)
Offset: Up to 1? full scale (10? on expand)
Harmonic rejection -55 dB (band pass filter in)
Outputs and Interfaces
Channel 1 outputs: X (Rcos?), X Offset, X Noise, R*, R Offset*, X5 (ext. D/A)*
Channel 2 outputs*: Y (Rsin?), Y offset, ?, Y noise, X6 (ext. D/A)
Output meters: 2 % precision analog meter
Output LCD: 4-digit LCD display shows same value as the analog meter.
Output BNC: ?10 V corresponds to full scale input (<1 ? output impedance)
X output*: X (Rcos?), ?10 V, <1 ? output impedance
Y output*: Y (Rsin?), ?10 V, <1 ? output impedance
Reference LCD: 4-digit LCD display for reference phase shift or frequency
X1 to X4: 4 analog inputs, 13-bit, ?10.24 V
X5, X6: 2 analog outputs, 13-bit, ?10.24 V
Ratio: Ratio output equals 10? signal output divided by the denominator of the input.
Internal oscillator
Range: 1 Hz to 100 kHz
Accuracy: 10 %
Stability: 150 ppm/?C (frequency), 500 ppm/?C (amplitude)
Distortion: 2 % THD
Amplitude: 10 mVrms, 100 mVrms, 1 Vrms
Computer interfaces: RS-232 standard, GPIB optional. All instrument functions can be controlled and read through the interfaces.
General
Power: 35 W, 100/120/220/240 VAC, 50/60 Hz
Dimensions: (SR510) 17″” ? 3.5″” ? 17″” (WHL)
(SR530) 17″” ? 5.25″” ? 17″” (WHL)
Weight: 12 lbs. (SR510), 16 lbs. (SR530)
Warranty: One year parts and labor on defects in materials and workmanship
* SR530 only
Others
N/A
