锁相放大器

SR810 and SR830 Lock-In Amplifiers

锁相放大器

1 mHz to 102.4 kHz Frequency Range

>100 dB Dynamic Reserve

5 ppm/°C Stability

0.01 Degree Phase Resolution

Time Constants from 10 μs to 30 ks

(up to 24 dB/oct rolloff)

Auto-Gain, -Phase, -Reserve and -Offset

Synthesized Reference source

GPIB and RS-232 Interfaces

SR810 and SR830 Lock-In Amplifiers

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 MΩ + 25 pF, AC or DC coupled

     Current input

1 kΩ 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 MΩ, 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 μs 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 μHz

Frequency resolution

4? digits or 0.1 mHz, whichever is greater

Distortion

-80 dBc (f <10 kHz), -70 dBc (f >10 kHz) @ 1 Vrms amplitude

Amplitude

0.004 to 5 Vrms into 10 kΩ (2 mV resolution), 50 Ω output impedance, 50 mA maximum 

current into 50 Ω

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, Θ, 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, Θ, 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