SR810 and SR830 Specifications

Signal Channel OutputsSine, TTL(When using an externalreference, both outputs are phase locked to the external reference.) Channel 14½-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)4½-digit LED display with 40-segment LED bar graph. Y, Voltage inputsSingle-ended or differentialSensitivity2 nVto 1 V Current input10 Displays θ , Y-noise, Aux 3 or Aux 4. The display can also be any of these quantities divided by Aux 3 or Aux 4.OffsetX, Y, R can be offset up to ±105 % of full scale.ExpandX, Y, R can be expanded by 10
6 or 10
8 V/AInput impedanceVoltage10 M Ω + 25 pF, AC or DC coupledCurrent1 k × â„¦ to virtual groundGain accuracy±1 % (±0.2 % typ.)Noise (typ.)6 nV/ or 100 × .Reference4½-digit LED display √ Hz at 1 kHz0.13 pA/ √ Hz at 1 kHz (10
6 V/A)0.013 pA/ Inputs and Outputs √ Hz at 100 Hz (10
8 V/A)Line filters50/60 Hz and 100/120 Hz (Q = 4 ) CMRR100 dB to 10 kHz, decreasing by 6 dB/oct above 10 kHzDynamic reserve>100 dB (without prefilters) Stability<5 ppm/°C CH1 outputX, R, X-noise, Aux 1 or Aux 2, (±10 V), updated at 512 HzCH2 output (SR830)Y, Frequency range0.001 Hz to 102.4 kHzReference inputTTLor sine (400 mVpp min.) Input impedance1 M Ω , 25 pFPhase resolution0.01° front panel, 0.008° throughcomputer interfaces Absolute phase error<1°Relative phase error<0.001°Orthogonality90° ± 0.001° Phase noiseInternal ref.Synthesized, <0.0001° rms at 1 kHz External ref.0.005° rms at 1 kHz (100 ms time constant, 12 dB/oct)Phase drift<0.01°/°C below 10 kHz, <0.1°/°C above 10 kHzHarmonic detection2F, 3F, ... nF to 102 kHz (n < 19,999) Acquisition time(2 cycles + 5 ms) or 40 ms, whichever is larger θ , Y-noise, Aux 3 or Aux 4, (±10 V), updated at 512 HzX, YoutputsIn-phase and quadrature components (rear panel)(±10 V), updated at 256 kHz. Aux. A/D inputs4 BNC inputs, 16-bit, ±10 V, 1 mVresolution, sampled at 512 HzAux. D/Aoutputs4 BNC outputs, 16-bit, ±10 V, 1 mVresolution Sine outInternal oscillator analog outputTTLoutInternal oscillator TTLoutputData bufferThe 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 preampProvides power to the optional SR550, SR552 and SR554 preamps Reference Channel demodulator General StabilityDigital outputs and display: no driftAnalog outputs: <5 ppm/°C for all dynamic reserve settingsHarmonic rejection − 90 dBTime constants10 InterfacesIEEE-488.2 and RS-232 interfaces standard. All instrument functions can be controlled and read through IEEE-488.2 or RS-232 interfaces.Power40 W, 100/120/220/240 VAC, 50/60 HzDimensions17 µ s to 30 ks (6, 12, 18, 24 dB/oct rolloff). Synchronous filters available below 200 Hz. " × 5.25 " × 19.5 " (WHD)Weight23 lbs.WarrantyOne year parts and labor on defectsin materials and workmanship Range1 mHz to 102 kHzFrequency accuracy25 ppm + 30 µ HzFrequency resolution4½ digits or 0.1 mHz, whichever is greaterDistortion Internal oscillator − 80 dBc (f <10 kHz), − 70 dBc(f >10 kHz) @ 1 Vrms amplitudeAmplitude0.004 to 5 Vrms into 10 k Ω (2 mVresolution), 50 Ω output impedance, 50 mAmaximum current into 50 Ω Amplitude accuracy1 % Amplitude stability50 ppm/°C

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