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  1. 澳门博彩评级



    更新時間: 2019-01-30 14:25:02




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    DESCRIPTIONThe SIGNAL RECOVERY model 7225 offers a cost-effective solution to the researcherneeding the performance provided by DSP demodulation but not requiring the additionalfeatures or higher operating frequencies of the models 7280 and 7265.The instrument performs all of the normal measurements of a dual phase lock-inamplifier, measuring the in-phase and quadrature components, vector magnitude, phaseangle and noise of the input signal.Two auxiliary ADC inputs, four DAC outputs and eight output logic lines are provided.These can be used to record the magnitude of external signals associated with theexperiment, such as temperature or pressure, or to generate voltages to control orswitch other equipment. Information from the ADCs together with the lock-in amplifier'soutput data can be stored in the 32k point buffer memory prior to transfer back to acontrolling computer.The model 7225 is extremely easy to use. All instrument controls are adjusted via theleft-hand display panel and its associated keys, while the right hand panel shows thetwo selected instrument outputs. Auto functions need only two keypresses to activateand in many cases eliminate the need for manual control adjustment.External control of the unit is via either the RS232 or GPIB interfaces, using simplemnemonic-type ASCII commands. A second RS232 port allows up to sixteen 7225 orcompatible instruments to be operated from a single RS232 computer port byconnecting them in a “daisy-chain” configuration.Compatible software is available in the form of a LabVIEW driver supporting allinstrument functions, the Acquire lock-in amplifier applications software and theSRInstComms ActiveX control and software toolkit. The driver and a demonstrationversion of the applications software, DemoAcquire, are available for dow FEATURES􀂊 0.001 Hz to 120 kHz operation􀂊 Voltage and current mode inputs􀂊 Direct digital demodulation without down-conversion􀂊 10 μs to 100 ks output time constants􀂊 Quartz crystal stabilized internal oscillator􀂊 Synchronous oscillator output for input offset reduction􀂊 Harm APPLICATIONS􀂊 Chopped light measurements􀂊 AC bridge measurements􀂊 Audio studies􀂊 AC impedance studies􀂊 Vibration studies􀂊 Thermal wave detection

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    • 北京燕京電子有限公司  
    • 電話:86-10-5823716
    • 傳真:86-10-59222787
    • 手機:15015150340
    • 聯系人:劉先生
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