数字锁相放大器

Model 7225
Dual Phase DSP Lock-in Amplifier

Models 7225/7225BFP and 7265
Specifications

The table gives the specifications for the models 7225/7225BFP and 7265 DSP Lock-in Amplifiers. Where specifications differ between models they are shown on a gray background.

		7225/7225BFP	7265
Input
Voltage
	Mode	A only -B only or Differential	A only -B only or Differential
	Sensitivity	2 nV to 1 V	2 nV to 1 V
	Impedance
	FET Device	10 MW // 30 pF	10 MW file://30 pF
	Bipolar Device	10 kW // 30 pF	10 kW // 30 pF
	Noise
	FET Device	5 nV/?/font>Hz at 1 kHz	5 nV/?/font>Hz at 1 kHz
	Bipolar Device	2 nV/?/font>Hz at 1 kHz	2 nV/?/font>Hz at 1 kHz
	C.M.R.R.	> 100 dB at 1 kHz	> 100 dB at 1 kHz
	Gain Accuracy	0.2% typ (full bandwidth)	0.2% typ (full bandwidth)
	Line Filter	attenuates 50 60 100 120 Hz	attenuates 50 60 100 120 Hz
Current
	Mode	Low-noise or Wideband	Low-noise or Wideband
	Sensitivity
	Low Noise	2 fA to 10 nA	2 fA to 10 nA
	Wideband	2 fA to 1	2 fA to 1
	Impedance
	Low Noise	< 2.5 kW	< 2.5 kW
	Wideband	< 250 W	< 250 W
	Noise
	Low Noise	13 fA/?/font>Hz	13 fA/?/font>Hz
	Wideband	130 fA/?/font>Hz	130 fA/?/font>Hz
	Gain Accuracy
	Low Noise	?/font> 0.6% typ (midband)	?/font> 0.6% typ (midband)
	Wideband	?/font> 0.6% typ (midband)	?/font> 0.6% typ (midband)
Dynamic Reserve		> 100 dB	> 100 dB
Frequency Response		1 mHz to 120 kHz	1 mHz to 250 kHz
Detection Modes
	Phases	2	2
	Harmonic	nF (nF < 250 kHz n < 32)	nF (nF < 250 kHz n < 65536)
	Dual Harmonic	N/A	Detects and measures two different harmonics simultaneously (F1 and F2 < 20 kHz)
	Dual Reference	N/A	Detects and measures at two different reference frequencies simultaneously (F1 and F2 < 20 kHz)
	Virtual Reference™	N/A	Detects a signal without a reference (100 Hz ?/font> F ?/font> 60 kHz)
	Spectral Display	N/A	Computes and displays graphically the input signal power spectral density at frequencies up to 60 kHz
	Noise	Measures noise in a given bandwidth centered on frequency F	Measures noise in a given bandwidth centered on frequency F
Output
	Fast outputs
	Time constant	10  to 640	10  to 640
	Outputs available	X & Y	X & Y or X & MAG
	Voltage for 眆ull-scale input	?.5 V linear to ?00% f.s.	?.5 V linear to ?00% f.s.
	Impedance	1 kW	1 kW
	Update Rate	166 kHz	166 kHz
	Roll-off	6 dB/octave	6 dB/octave
	Other Outputs
	Time constant	5 ms to 100 ks	5 ms to 100 ks
	Outputs available	X Y R q Noise	X Y R q Noise Ratio Log Ratio
	Voltage for 眆ull-scale input	?0.0 V linear to ?10% f.s.	?0.0 V linear to ?10 f.s.
	Impedance	1 kW	1 kW
	Update Rate	200 Hz	200 Hz
	Roll-off	6 12 18 and 24 dB/octave	6 12 18 and 24 dB/octave
Oscillator
	Amplitude Range	1 mV to 5 V	1  to 5 V
	Amplitude Sweep	Linear: computer control only	Linear: manual or computer control
	Amplitude Resolution
	1 礦 to 4 mV	N/A	1
	1 mV to 4 mV	1 mV	N/A
	4 mV to 500 mV	1 mV	125
	501 mV to 2 V	4 mV	500
	2.001 V to 5 V	10 mV	1.25 mV
	Frequency Range	1 mHz to 120 kHz	1 mHz to 250 kHz
	Frequency Sweep	Linear or Logarithmic: computer control only	Linear or Logarithmic: manual or computer control
	Impedance	50 W	50 W
Auxiliary Control		2 ADC &  2 DAC with ? mV resolution ?0 mV accuracy in ?0 V 8 logic lines	3 ADC & 4 DAC with ? mV resolution ?0 mV accuracy in ?0 V 8 logic lines
Data Buffer		32k 16-bit data points	32k 16-bit data points
Interface		RS232 GPIB (IEEE-488). A second RS232 is provided for "daisy-chain" connection of up to sixteen compatible instruments	RS232 GPIB (IEEE-488). A second RS232 is provided for "daisy-chain" connection of up to sixteen compatible instruments

 

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