SR810 & SR830 – 100 kHz lock-in amplifier

Technical Specifications

Signal Channel
Voltage inputs: Single-ended or differential
Sensitivity: 2 nV to 1 V
Current input: 106 or 108 V/A
Input impedance
Voltage input: 10 M? + 25 pF, AC or DC coupled
Current input: 1 k? to virtual ground
Gain accuracy: ?1 % (?0.2 % typ.)
Noise: 6 nV/?Hz at 1 kHz
0.13 pA/?Hz at 1 kHz (106 V/A)
0.013 pA/?Hz at 100 Hz (108 V/A)
Line filters: 50/60 Hz and 100/120 Hz (Q=4)
CMRR: 100 dB at 10 kHz, decreasing by 6 dB/oct above 10 kHz
Dynamic reserve: >100 dB (without prefilters)
Stability: <5 ppm/?C

Reference Channel
Frequency range: 0.001 Hz to 102.4 kHz
Reference input: TTL or sine (400 mVpp min.)
Input impedance: 1 M?, 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
Int. reference: Synthesized, <0.0001? rms at 1 kHz
Ext. reference: 0.005? rms at 1 kHz, 100 ms, 12 dB/oct
Phase drift: <0.01?/?C below 10 kHz,
<0.1?/?C, 10 kHz to 100 kHz
Harmonic detection: 2F, 3F, … nF to 102 kHz (n < 19,999)
Acquisition time: (2 cycles + 5 ms) or 40 ms, whichever is greater

Demodulator
Stability: Digital outputs and display: no drift. Analog outputs: <5 ppm/?C for all dynamic reserve settings.
Harmonic rejection: -90 dB
Time constants: 10 ?s to 30 ks (6, 12, 18, 24 dB/oct rolloff). Synchronous filters available below 200 Hz.
Internal Oscillator
Range: 1 mHz to 102 kHz
Accuracy: 25 ppm + 30 ?Hz
Frequency resolution: 4? digits or 0.1 mHz, whichever is greater
Distortion: -80 dBc (f 10 kHz) @ 1 Vrms amplitude
Amplitude: 0.004 to 5 Vrms into 10 k? (2 mV resolution), 50 ? output impedance, 50 mA maximum current into 50 ?
Amplitude accuracy: 1 %
Amplitude stability: 50 ppm/?C
Outputs: Sine, TTL (When using an external reference, both outputs are phase locked to the external reference.)

Displays
Channel: 4?-digit LED display with 40-segment LED bar graph. X, R, X-noise, Aux 1 or Aux 2. The display can also be any of these quantities divided by Aux 1 or Aux 2.
Channel 2 (SR830): 4?-digit LED display with 40-segment LED bar graph. Y, ?, Y-noise, Aux 3 or Aux 4. The display can also be any of these quantities divided by Aux 3 or Aux 4.
Offset: X, Y, R can be offset up to ?105 % of full scale.
Expand: X, Y, R can be expanded by 10? or 100?.
Reference: 4?-digit LED display

Inputs and Outputs
CH1 output: ?10 V output of X, R, X-noise, Aux 1 or Aux 2. Updated at 512 Hz.
CH2 output (SR830): ?10 V output of Y, ?, Y-noise, Aux 3 or Aux 4. Updated at 512 Hz.
X, Y outputs: In-phase and quadrature components
(rear panel): (?10 V), updated at 256 kHz
Aux. A/D inputs: 4 BNC inputs, ?10 V, 1 mV resolution, sampled at 512 Hz
Aux. D/A outputs: 4 BNC outputs, ?10 V, 1 mV resolution
Sine Out: Internal oscillator analog output
TTL Out: Internal oscillator TTL output
Data buffer: The SR810 has an 8k point buffer. The SR830 has two 16k point buffers. Data is recorded at rates to 512 Hz and read through the computer interfaces.
Trigger In (TTL): Trigger synchronizes data recording
Remote pre-amp: Provides power to the optional SR550, SR552 and SR554 preamplifiers

General
Interfaces: IEEE-488.2 and RS-232 interfaces standard. All instrument functions can be controlled and read through IEEE-488.2 or RS-232 interfaces.
Power: 40 W, 100/120/220/240 VAC, 50/60 Hz
Dimensions: 17″” ? 5.25″” ? 19.5″” (WHL)
Weight: 23 lbs.
Warranty: One year parts and labor on defects in materials and workmanship

 

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