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srs SR844-200 MHz lock-in amplifier

简要描述:srs SR844-200 MHz lock-in amplifier

  • 产品型号:SR844
  • 厂商性质:经销商
  • 更新时间:2023-12-20
  • 访  问  量:1126

详细介绍

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srs SR844-200 MHz lock-in amplifier

 

主要指标与说明The SR844 is the widest bandwidth lock-in amplifier available. It provides uncompromised performance with a frequency range of 25 kHz to 200 MHz and up to 80 dB of drift-free dynamic reserve. The SR844 includes the many features, ease of operation, and programmability that you've come to expect from SRS DSP lock-in amplifiers.

 

SR844 RF Lock-In Amplifier25 kHz to 200 MHz range80 dB dynamic reserveTime constants from 100 μs to 30 ks (6, 12, 18 or 24 dB/oct rolloff)"No Time Constant" mode (10 μs to 20 μs update rate)Auto-gain, -phase, -reserve & -offsetInternal or external referenceTwo 16-bit DACs and ADCsGPIB and RS-232 interfacesSR844 RF Lock-In AmplifierThe SR844 is the widest bandwidth lock-in amplifier available. It provides uncompromised performance with a frequency range of 25 kHz to 200 MHz and up to 80 dB of drift-free dynamic reserve. The SR844 includes the many features, ease of operation, and programmability that you've come to expect from SRS DSP lock-in amplifiers.Digital TechnologyThe SR844 uses the same advanced DSP technology found in the SR850, SR830 and SR810 lock-in amplifiers. DSP offers many advantages over analog instruments-high dynamic reserve, low zero-drift, accurate RF phase shifts and orthogonality, and digital output filtering. SR844 Block DiagramSignal InputThe SR844 has both 50 Ω and 1 MΩ inputs. The 1 MΩ input is used with high source impedances at low frequencies, or with a standard 10× scope probe. The 50 Ω input provides the best RF signal matching. Full-scale sensitivities range from 1 Vrms (+13 dBm) down to 100 nVrms (-127 dBm). Up to 60 dB of RF attenuation or 20 dB of RF gain can be selected in 20 dB increments. Gain allocation can be optimized to provide up to 80 dB of dynamic reserve.ReferenceThe SR844 offers both external and internal reference operation. In both cases, the entire 25 kHz to 200 MHz frequency range is covered without any manual range selection. The external reference input has an auto-threshold feature which locks to sine, square or pulsed signals. The internal reference is digitally synthesized and is adjustable with 3-digit frequency resolution.Harmonic detection of the 2F component is available for both internal and external reference modes.A reference output (1.0 Vpp square wave into 50 Ω) which is phase synchronous with the lock-in reference is available in both external and internal mode.Output FiltersTime constants from 100 μs to 30 ks can be selected with a choice of 6, 12, 18 or 24 dB/oct rolloff. For high-bandwidth, real-time outputs, the filtering can be by-passed entirely. In this "No Filter" mode, the effective time constant is about 30 μs, with the analog outputs updating every 10 to 20 μs.Ease of OperationThe SR844 is easy to use. All instrument functions are set from the front-panel keypad, and the knob is used to quickly adjust parameters. Up to nine different instrument configurations can be stored in non-volatile memory for fast, reliable instrument setup. Standard RS-232 and GPIB (IEEE-488.2) interfaces provide connections to your data acquisition systems.

 

Useful FeaturesAuto-functions allow parameters that are frequently adjusted to be set automatically. Sensitivity, dynamic reserve, phase and offset are each quickly optimized with a simple key stroke.The offset and expand features are useful for evaluating small fluctuations in your signal. The input is nulled with the auto-offset function, and output expand increases the resolution by up to 100×.Ratio mode is used to normalize the signal to an externally applied analog voltage. It is useful to eliminate the effect of source intensity fluctuations.Transfer function measurements can be easily made from the front panel by a programmable scan of up to 11 frequencies. Setups and offsets are recalled at each frequency in the scan.Analog Inputs and OutputsThe two displays each have a user-defined output for measuring X, Y, R, R(dBm), Θ, and X-noise or Y-noise. Two user-programmable DACs provide -10.5 V to +10.5 V outputs with 1 mV resolution. These outputs may be set from the front panel or via the computer interfaces.In addition, there are two general purpose analog inputs. These are 16-bit ADCs which can be displayed on the front panel, read over the interface, or used to ratio the input signal.Internal MemoryThe SR844 has two 16,000 point memory buffers for recording the time history of each measurement display at rates up to 512 samples/s. Data may be transferred from the buffers using either interface. A trigger input is also provided to synchronize data recording with external events. SR844 RF Lock-In AmplifierSignal ChannelVoltage input Single-ended BNCInput impedance 50 Ω or 1 MΩ + 30 pFDamage threshold ±5 V (DC + AC)Bandwidth 25 kHz to 200 MHzSensitivity <1 MHz 100 nVrms to 1 Vrms full scale <50 MHz 1 μVrms to 1 Vrms full scale <200 MHz 10 μVrms to 1 Vrms full scaleGain accuracy <50 MHz ± 0.25 dB <200 MHz ± 0.50 dBGain stability 0.2 %/°CCoherent pickup Low noise reserve, sensitivity <30 mV f < 10 MHz <100 nV (typ.) f < 50 MHz <2.5 μV (typ.) f < 200 MHz <25 μV (typ.)Input noise (50 Ω) 2 nV/√Hz (typ.), 8 nV/√Hz (max.)Input noise (1 MΩ), 5 nV/√Hz (typ.), 8 nV/√Hz (max.)Dynamic reserve up to 80 dB

 

Reference ChannelExternal reference input 25 kHz to 200 MHz Impedance 50 Ω or 10 kΩ + 40 pF Level 0.7 Vpp pulse or 0 dBm sine Pulse width >2 ns at any frequency Threshold setting Automatic, midpoint of waveform Acquisition time <10 s (auto-ranging, any frequency) <1 s (within same octave)Internal reference 25 kHz to 200 MHz Frequency resolution 3 digits Frequency accuracy ±0.1 in the 3rd digitHarmonic detection 2F (50 kHz to 200 MHz)Reference outputs Phase locked to Int. or Ext. reference Front panel ref output 25 kHz to 200 MHz square wave, 1.0 Vpp nominal into 50 Ω Rear panel TTL output 25 kHz to 1.5 MHz, 0 to +5 V nominal, ≥3 V into 50 ΩPhase resolution 0.02°Absolute phase error <50 MHz <2.5° <100 MHz <5.0° <200 MHz <10.0°Rel. phase error, orthog. <2.5°Phase noise (external) 0.005° rms at 100 MHz, 100 ms time constantPhase drift <10 MHz <0.1°/°C <100 MHz <0.25°/°C <200 MHz <0.5°/°CDemodulatorZero stability Digital displays have no zero-drift.Analog outputs have <5 ppm/°C drift for all dynamic reserve settings.Time constants 100 μs to 30 ks with 6, 12, 18 or 24 dB/octave rolloff”No Filter” mode 10 to 20 μs update rate (X and Y)Harmonic rejection Odd harmonics -9.5 dBc @3 × ref, -14 dBc @5 × ref, etc. (20log 1/n where n = 3, 5, 7, 9...) Even harmonics <-40 dBcSub-harmonics <-40 dBcSpurious responses -10 dBc @ ref ± 2 × IF-23 dBc @ ref ± 4 ×IF<-30 dBc otherwiseDisplaysChannel 1 Type 4?-digit LED with 40-segment bar graph Quantities X, R[V or dBm], X-noise, Aux In 1Channel 2 Type 4?-digit LED with 40-segment bar graph Quantities Y, Θ, Y-noise[V or dBm], Aux In 2Expand ×10 or ×100 for Ch1 and Ch2Ratio X and Y ratioed with respect to Aux In 1 or Aux In 2 before filtering and computation of R. The ratio input is normalized to 1 V and has a dynamic range greater than 100.Reference Type 4?-digit LED Quantities Reference Frequency, Phase, Offsets, Aux Out, IF Frequency, Elapsed TimeChannel 1 and Channel 2 OutputsVoltage range ±10 V full scale proportional to X, Y or CH1, CH2 displayed quantityUpdate Rate X, Y 48 to 96 kHz R, Θ, Aux inputs 12 to 24 kHz X-noise, Y-noise 512 HzAuxiliary Inputs and OutputsInputs 2 Type Differential, 1 MΩ Range ±10 V Resolution 0.33 mV Bandwidth 3 kHzOutputs 2 Range ±10 V Resolution 1 mVData Buffers Two 16,000 point buffers. Data is recorded at rates up to 512 Hz and is read using the computer interfaces.GeneralInterfaces IEEE-488.2 and RS-232 interfaces are standard. All instrument functions can be controlled and read through the interfaces.Power 70 W, 100/120/220/240 VAC, 50/60 HzDimensions 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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