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  • Voltage Input Modes A only, -B only or Differential (A-B) Full-scale Sensitivity 0.5 Hz ?/font> F ?/font> 250 kHz 10 nV to 1 V in a 1-2-5 sequence 250 kHz < F ?/font> 2.0 MHz 100 nV to 1 V in a 1-2-5 sequence Max. Dynamic Reserve > 100 dB Impedance 100 MW // 25 pF Maximum Safe Input 20 V pk-pk Voltage Noise 5 nV/?/font>Hz @ 1 kHz C.M.R.R. > 100 dB @ 1 kHz Frequency Response 0.5 Hz to 2.0 MHz Gain Accuracy ?.3% typ, ?.6% max. (full bandwidth) Distortion -90 dB THD (60 dB AC gain, 1 kHz) Line Filter attenuates 50, 60, 100, 120 Hz Grounding BNC shields can be grounded or floated via 1 kW to ground Current Input Mode Low Noise, Normal or Wide Bandwidth Full-scale Sensitivity Low Noise 10 fA to 10 nA in a 1-2-5 sequence Normal 10 fA to 1 �A(ch��) in a 1-2-5 sequence Wide Bandwidth F ?/font> 250 kHz 1 pA to 100 �A(ch��) in a 1-2-5 sequence F > 250 kHz 10 pA to 100 �A(ch��) in a 1-2-5 sequence Max. Dynamic Reserve > 100 dB Frequency Response (-3 dB): Low Noise ?/font> 500 Hz Normal ?/font> 50 kHz Wide Bandwidth ?/font> 1 MHz Impedance Low Noise < 2.5 kW @ 100 Hz Normal < 250 W @ 1 kHz Wide Bandwidth < 25 W @ 10 kHz Noise Low Noise 13 fA/?/font>Hz @ 500 Hz Normal 130 fA/?/font>Hz @ 1 kHz Wide Bandwidth 1.3 pA/?/font>Hz @ 1 kHz Gain Accuracy ? 0.6% typ, midband Line Filter attenuates 50, 60, 100, 120 Hz Grounding BNC shield can be grounded or floated via 1 kW to ground Reference Channel TTL Input Frequency Range 0.5 Hz to 2.0 MHz Analog Input Impedance 1 MW // 30 pF Sinusoidal Input Level 1.0 V rms�� Frequency Range 0.5 Hz to 2.0 MHz Squarewave Input Level 250 mV rms Frequency Range 2 Hz to 2 MHz ��Note: Lower levels can be used with the analog input at the expense of increased phase errors Phase Set Resolution 0.001?/font> increments Phase Noise at 100 ms TC, 12 dB/octave slope: Internal Reference < 0.0001?/font> rms External Reference < 0.01?/font> rms @ 1 kHz Orthogonality 90?/font> ?.0001?/font> Acquisition Time Internal Reference instantaneous acquisition External Reference 2 cycles + 50 ms Reference Frequency Meter Resolution 1 ppm or 1 mHz, whichever is the greater DemodulatorOutput Processing Output Zero Stability Digital Outputs No zero drift on all settings Displays No zero drift on all settings Not Available Analog Outputs < 5 ppm/?/font>C Harmonic Rejection -90 dB Output Filters X, YR outputs only Time Constant 1 �s to 1 ms in a 1-2-5 sequence,4 ms Slope (roll-off) 612 dB/octave All outputs Time Constant 5 ms to 100 ks in a 1-2-5 sequence Slope 6, 12, 1824 dB/octave Synchronous Filter Available for F < 20 Hz Offset AutoManual on X and/or Y: ?00% full-scale Absolute Phase Measurement Accuracy ?/font> 0.01?/font> Oscillator Frequency Range 0.5 Hz to 2.0 MHz Setting Resolution 1 mHz Absolute Accuracy ? 50 ppm Distortion (THD) -80 dB @ 1 kHz100 mV rms Amplitude (rms) Range 1 mV to 1 V Setting Resolution 1 mV Accuracy ?.2% Stability 50 ppm/?/font>C Output Impedance 50 W Sweep Amplitude Sweep Output Range 0.000 to 1.000 V rms Law Linear Step Rate 20 Hz maximum (50 ms/step) Frequency Sweep Output Range 0.5 Hz to 2.0 MHz Law Linear or Logarithmic Step Rate 20 Hz maximum (50 ms/step) Auxiliary Inputs ADC 1, 2, 34 Maximum Input ?0 V Resolution 1 mV Accuracy ?0 mV Input Impedance 1 MW // 30 pF Sample Rate ADC 1 only 40 kHz max. ADC 12 17.8 kHz max. Trigger Mode Internal, External or burst Trigger Input TTL compatible Outputs Main Analog (CH1CH2) Outputs: Function X, Y, R, q, Noise, Ratio, Log RatioUser Equations 1 & 2. Amplitude ?.5 V full-scale; linear to ?00% full-scale Impedance 1 kW Update Rate X, Y or R @ TC ?/font>4 ms 7.5 MHz All outputs @ TC ?/font>5 ms 1 kHz Signal Monitor Amplitude ? V FS Impedance 1 kW Auxiliary D/A Output 12: Maximum Output ?0 V Resolution 1 mV Accuracy ?0 mV Output Impedance 1 kW 8-bit Digital Port 0 to 8 lines can be configured as inputs, with the remainder being outputs. Each output line can be set high or loweach input line read to allow interaction with external equipment. Extra line acts as trigger input Reference Output Waveform 0 to 3 V rectangular wave, active in External Reference Mode only Impedance TTL-compatible Power - Low Voltage ?5 V at 100 mA rear panel 5-pin 180?DIN connector for powering SIGNAL RECOVERY preamplifiers Data Storage Buffer Size 32k ?16-bit data points, may be organized as 1?2k, 2?6k, 3?0.6k, 4?k, etc. Max Storage Rate From LIA up to 1000 16-bit values per second From ADC1 up to 40,000 16-bit values per second User Settings Up to 8 complete instrument settings can be saved or recalled at will from non-volatile memory Not available Interfaces RS232GPIB (IEEE-488). A second RS232 port is provided to allow "daisy-chain" connectioncontrol of up to 16 units from a single RS232 computer port General Power Requirements Voltage 110/120/220/240 VAC Frequency 50/60 Hz Power 200 VA max Dimensions Width 17?quot; (435 mm) Depth 19" (485 mm) Height With feet 6" (150 mm) Without feet 5?quot; (130mm) Weight 25.4 lb (11.5 kg)  
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  • The model 7280 DSP Lock-in Amplifier is an exceptionally versatile instrument with outstanding performance. With direct digital demodulation over an operating frequency extending up to 2.0 MHz, output filter time constants down to 1 �sa main ADC sampling rate of 7.5 MHz it is ideal for recovering fast changing signals. But unlike some other high frequency lock-ins, it also works in the traditional audio frequency band. In addition to its excellent technical specifications, it is also very easy to use. The front panel is dominated by a large electroluminescent display panel, used both to show the instrument''s outputsfor adjusting its controls via a series of menus. Controls are set by a combination of the use of the keys surrounding the displaythe keypad, while four cursor-movement keys simplify use of the graphic display menus. Users of the SIGNAL RECOVERY (formerly PerkinElmer/EG&G) 72607265 will find switching to the 7280 very easy, since we''ve designed it with a similar menu structure. The only significant changes are in some of the control menus, where the better resolution of the display allows both the controlsthe instrument outputs to be shown simultaneously, for even faster feedback on the effects of control adjustments. Naturally, the instrument includes the extended operating modes like dual reference, dual harmonicvirtual reference made popular by the 72607265, as well as the spectral display mode used to aid reference frequency selection. It also includes GPIBRS232 interfaces for remote computer controla range of auxiliary analogdigital inputsoutputs. Software support is available in the form of a LabVIEW driver supporting all instrument functions,the Acquire™ data acquisition software. The drivera demonstration version of the software, DemoAcquire, are available for download from this site. In summary, if you need a lock-in capable of working beyond the traditional audio frequency band but still want the drift-free performance that only digital demodulation brings, then look no further - you have found it in the SIGNAL RECOVERY Model 7280.
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  • Voltage Input Modes A only, -B only or Differential (A-B) Full-scale Sensitivity 0.5 Hz ?/font> F ?/font> 250 kHz 10 nV to 1 V in a 1-2-5 sequence 250 kHz < F ?/font> 2.0 MHz 100 nV to 1 V in a 1-2-5 sequence Max. Dynamic Reserve > 100 dB Impedance 100 MW // 25 pF Maximum Safe Input 20 V pk-pk Voltage Noise 5 nV/?/font>Hz @ 1 kHz C.M.R.R. > 100 dB @ 1 kHz Frequency Response 0.5 Hz to 2.0 MHz Gain Accuracy ?.3% typ, ?.6% max. (full bandwidth) Distortion -90 dB THD (60 dB AC gain, 1 kHz) Line Filter attenuates 50, 60, 100, 120 Hz Grounding BNC shields can be grounded or floated via 1 kW to ground Current Input Mode Low Noise, Normal or Wide Bandwidth Full-scale Sensitivity Low Noise 10 fA to 10 nA in a 1-2-5 sequence Normal 10 fA to 1 �A(ch��) in a 1-2-5 sequence Wide Bandwidth F ?/font> 250 kHz 1 pA to 100 �A(ch��) in a 1-2-5 sequence F > 250 kHz 10 pA to 100 �A(ch��) in a 1-2-5 sequence Max. Dynamic Reserve > 100 dB Frequency Response (-3 dB): Low Noise ?/font> 500 Hz Normal ?/font> 50 kHz Wide Bandwidth ?/font> 1 MHz Impedance Low Noise < 2.5 kW @ 100 Hz Normal < 250 W @ 1 kHz Wide Bandwidth < 25 W @ 10 kHz Noise Low Noise 13 fA/?/font>Hz @ 500 Hz Normal 130 fA/?/font>Hz @ 1 kHz Wide Bandwidth 1.3 pA/?/font>Hz @ 1 kHz Gain Accuracy ? 0.6% typ, midband Line Filter attenuates 50, 60, 100, 120 Hz Grounding BNC shield can be grounded or floated via 1 kW to ground Reference Channel TTL Input Frequency Range 0.5 Hz to 2.0 MHz Analog Input Impedance 1 MW // 30 pF Sinusoidal Input Level 1.0 V rms�� Frequency Range 0.5 Hz to 2.0 MHz Squarewave Input Level 250 mV rms Frequency Range 2 Hz to 2 MHz ��Note: Lower levels can be used with the analog input at the expense of increased phase errors Phase Set Resolution 0.001?/font> increments Phase Noise at 100 ms TC, 12 dB/octave slope: Internal Reference < 0.0001?/font> rms External Reference < 0.01?/font> rms @ 1 kHz Orthogonality 90?/font> ?.0001?/font> Acquisition Time Internal Reference instantaneous acquisition External Reference 2 cycles + 50 ms Reference Frequency Meter Resolution 1 ppm or 1 mHz, whichever is the greater DemodulatorOutput Processing Output Zero Stability Digital Outputs No zero drift on all settings Displays No zero drift on all settings Not Available Analog Outputs < 5 ppm/?/font>C Harmonic Rejection -90 dB Output Filters X, YR outputs only Time Constant 1 �s to 1 ms in a 1-2-5 sequence,4 ms Slope (roll-off) 612 dB/octave All outputs Time Constant 5 ms to 100 ks in a 1-2-5 sequence Slope 6, 12, 1824 dB/octave Synchronous Filter Available for F < 20 Hz Offset AutoManual on X and/or Y: ?00% full-scale Absolute Phase Measurement Accuracy ?/font> 0.01?/font> Oscillator Frequency Range 0.5 Hz to 2.0 MHz Setting Resolution 1 mHz Absolute Accuracy ? 50 ppm Distortion (THD) -80 dB @ 1 kHz100 mV rms Amplitude (rms) Range 1 mV to 1 V Setting Resolution 1 mV Accuracy ?.2% Stability 50 ppm/?/font>C Output Impedance 50 W Sweep Amplitude Sweep Output Range 0.000 to 1.000 V rms Law Linear Step Rate 20 Hz maximum (50 ms/step) Frequency Sweep Output Range 0.5 Hz to 2.0 MHz Law Linear or Logarithmic Step Rate 20 Hz maximum (50 ms/step) Auxiliary Inputs ADC 1, 2, 34 Maximum Input ?0 V Resolution 1 mV Accuracy ?0 mV Input Impedance 1 MW // 30 pF Sample Rate ADC 1 only 40 kHz max. ADC 12 17.8 kHz max. Trigger Mode Internal, External or burst Trigger Input TTL compatible Outputs Main Analog (CH1CH2) Outputs: Function X, Y, R, q, Noise, Ratio, Log RatioUser Equations 1 & 2. Amplitude ?.5 V full-scale; linear to ?00% full-scale Impedance 1 kW Update Rate X, Y or R @ TC ?/font>4 ms 7.5 MHz All outputs @ TC ?/font>5 ms 1 kHz Signal Monitor Amplitude ? V FS Impedance 1 kW Auxiliary D/A Output 12: Maximum Output ?0 V Resolution 1 mV Accuracy ?0 mV Output Impedance 1 kW 8-bit Digital Port 0 to 8 lines can be configured as inputs, with the remainder being outputs. Each output line can be set high or loweach input line read to allow interaction with external equipment. Extra line acts as trigger input Reference Output Waveform 0 to 3 V rectangular wave, active in External Reference Mode only Impedance TTL-compatible Power - Low Voltage ?5 V at 100 mA rear panel 5-pin 180?DIN connector for powering SIGNAL RECOVERY preamplifiers Data Storage Buffer Size 32k ?16-bit data points, may be organized as 1?2k, 2?6k, 3?0.6k, 4?k, etc. Max Storage Rate From LIA up to 1000 16-bit values per second From ADC1 up to 40,000 16-bit values per second User Settings Up to 8 complete instrument settings can be saved or recalled at will from non-volatile memory Not available Interfaces RS232GPIB (IEEE-488). A second RS232 port is provided to allow "daisy-chain" connectioncontrol of up to 16 units from a single RS232 computer port General Power Requirements Voltage 110/120/220/240 VAC Frequency 50/60 Hz Power 200 VA max Dimensions Width 17?quot; (435 mm) Depth 19" (485 mm) Height With feet 6" (150 mm) Without feet 5?quot; (130mm) Weight 25.4 lb (11.5 kg)  
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  • The model 7280 DSP Lock-in Amplifier is an exceptionally versatile instrument with outstanding performance. With direct digital demodulation over an operating frequency extending up to 2.0 MHz, output filter time constants down to 1 �sa main ADC sampling rate of 7.5 MHz it is ideal for recovering fast changing signals. But unlike some other high frequency lock-ins, it also works in the traditional audio frequency band. In addition to its excellent technical specifications, it is also very easy to use. The front panel is dominated by a large electroluminescent display panel, used both to show the instrument''s outputsfor adjusting its controls via a series of menus. Controls are set by a combination of the use of the keys surrounding the displaythe keypad, while four cursor-movement keys simplify use of the graphic display menus. Users of the SIGNAL RECOVERY (formerly PerkinElmer/EG&G) 72607265 will find switching to the 7280 very easy, since we''ve designed it with a similar menu structure. The only significant changes are in some of the control menus, where the better resolution of the display allows both the controlsthe instrument outputs to be shown simultaneously, for even faster feedback on the effects of control adjustments. Naturally, the instrument includes the extended operating modes like dual reference, dual harmonicvirtual reference made popular by the 72607265, as well as the spectral display mode used to aid reference frequency selection. It also includes GPIBRS232 interfaces for remote computer controla range of auxiliary analogdigital inputsoutputs. Software support is available in the form of a LabVIEW driver supporting all instrument functions,the Acquire™ data acquisition software. The drivera demonstration version of the software, DemoAcquire, are available for download from this site. In summary, if you need a lock-in capable of working beyond the traditional audio frequency band but still want the drift-free performance that only digital demodulation brings, then look no further - you have found it in the SIGNAL RECOVERY Model 7280.
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