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the signal recovery model 7265 uses the latest digital signal processing (dsp) technology to extend the operating capabilities of the lock-in amplifier to provide the researcher with a central measurement and control facility. at the same time due consideration has been given to the needs of users wishing only to make a simple measurement quickly and easily.
operating over a frequency range of 1 mhz to 250 khz, the model 7265 offers full-scale voltage sensitivities down to 2 nv and current sensitivities to 2 fa. the unit has a choice of operating modes, signal recovery or vector voltmeter, for optimum measurement accuracy under different conditions, and the use of dsp techniques ensures exceptional performance.
the instrument performs all of the normal measurements of a dual phase lock-in amplifier, measuring the in-phase and quadrature components, vector magnitude, phase angle and noise of the input signal.
several new modes of operation are also include giving the user greater levels of versatility than ever before, for example;
virtual reference
under suitable conditions, this mode allows measurements to be made in the absence of a reference signal
dual reference
in this mode the instrument can make simultaneous measurements on two signals at different reference frequencies, which is ideal, for example, for use with our model 198a, model 197 or model 651-1 dual-beam choppers in source compensated optical experiments.
spectral display
this allows the spectrum of the signals present at the input to be calculated and displayed, which can help when choosing the reference frequency
transient recorder
in this mode, the auxiliary adc inputs can be used as a 40 ksa/s (25 祍/point) transient recorder, with the captured transient being displayed graphically
frequency response
this built-in experiment allows the internal oscillator frequency to be swept between preset frequencies, whilst simultaneously measuring the input signal magnitude and phase. the mode is ideal for determining the frequency and phase response of external networks
harmonic analysis
most lock-in amplifiers will measure signals at the applied reference frequency or its second harmonic. in the 7265, operation is possible at harmonics up the 65,536th, and in dual harmonic mode, simultaneous measurements can be taken on two harmonics
three auxiliary adc inputs, one of which is a special integrating convertor, four dac outputs and eight output logic lines are provided. these can be used to record the magnitude of external signals associated with the experiment, such as temperature or pressure, or to generate voltages to control or switch other equipment. information from the adcs together with the lock-in amplifier"s output data can be stored in the 32k point buffer memory, and even displayed graphically on screen.
the model 7265 is extremely easy to use. all instrument controls are adjusted using soft-touch, front panel push-buttons, with the present settings and measured outputs being displayed on the centrally located, cold fluorescent backlit dot-matrix lcd. a particularly convenient new feature is the pop-up keypad which is used when setting controls that need adjusting to a large number of significant figures.
control se-lection and adjustment is aided by the logical structure of on-screen menus and sub-menus, supported by a series of context-sensitive help screens. a number of built-in automatic functions are also provided to simplify instrument operation.
external control of the unit is via either the rs232 or gpib interfaces, using simple mnemonic-type ascii commands. a second rs232 port allows up to sixteen 7265 or compatible instruments to be operated from a single rs232 computer port by connecting them in a "daisy-chain" configuration.
software support is available in the form of a labview driver supporting all instrument functions, and the acquire? lock-in amplifier applications software. the driver and a demonstration version of the software, demoacquire, are available for download from this site.
北京燕京電子有限公司成立于1988年,是北京電子控股有限責(zé)任公司直屬企業(yè),是一家全球集成供應(yīng)商和專業(yè)設(shè)備及儀器的服務(wù)商。公司目前經(jīng)營(yíng)規(guī)模超億元,主 營(yíng)業(yè)務(wù)為向國(guó)內(nèi)外科研院所、大型設(shè)備制造業(yè)和金融業(yè)提供成套集成供應(yīng)及專業(yè)設(shè)備儀器的維護(hù)、運(yùn)行等專業(yè)化的系統(tǒng)解決方案和服務(wù)。
在全球制造行業(yè),燕京公司在世界各地?fù)碛斜姸嗟拈L(zhǎng)期代理商和合作伙伴,經(jīng)過(guò)長(zhǎng)期合作交流的實(shí)踐建立了廣泛的市場(chǎng)營(yíng)銷網(wǎng)絡(luò)。同時(shí)與國(guó)內(nèi)各相關(guān)領(lǐng)域的重要 廠商也建立有良好的合作關(guān)系,為大型設(shè)備制造業(yè)的客戶提供成套原材料、零部件及電子元器件。
在儀器服務(wù)方面,燕京公司是眾多國(guó)際知名儀器設(shè)備廠商在中國(guó)的重要合作伙伴。公司致力于從事工業(yè)電子、教學(xué)科研、通信技術(shù)以及電力石化等領(lǐng)域的產(chǎn)品 銷售和系統(tǒng)集成,能夠?yàn)橛脩籼峁└鞣N良好的針對(duì)行業(yè)的、完整的測(cè)試應(yīng)用解決方案。
ULTRA LOW-NOISE PREAMPLIFIER Voltage, Med I/P Z, 0.5 Hz – 1 MHz, very low noise, x1000, battery or l
HIGH PERFORMANCE DUAL PHASE LOCK-IN AMPLIFIER Voltage and current sensitive, 10nV max sens, 0.5 – 12
The instrument performs all of the normal measurements of a dual phase lock-in amplifier, measuring
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