Model 7270
Specifications

The table gives the specifications for the Model 7270 DSP Lock-in Amplifier. A printable PDF brochure is also available - see the link on the left.

General		Dual-phase DSP lock-in amplifier operating over a reference frequency range of 1 mHz to 250 kHz. Main ADC sampling rate, and analog output update rate, of 1 MSa/s. Wide range of extended measuring modes and auxiliary inputs and outputs. User-upgradeable firmware.
Measurement Modes
	Outputs	The instrument can simultaneously show any four of these outputs on the front panel display: X In-phase Y Quadrature R Magnitude Θ Phase Angle Noise
	Harmonic Detection	nF, n ≤ 127
	Dual Harmonic	Simultaneously measures the signal at two different harmonics F1 and F2 of the reference frequency
	Dual Reference	Simultaneously measures the signal at two different reference frequencies, F1 and F2 where F1 is the external and F2 the internal reference
	Tandem Demodulation	Demodulates the signal using the internal reference frequency F1, and then passes the resulting X channel output to a second demodulator running at an external reference frequency F2
	Virtual Reference	Locks to and detects a signal without a reference (100 Hz ≤ F ≤ 150 kHz)
	Noise	Measures noise in a given bandwidth centered at the reference frequency F
	Spectral Display	Gives a visual indication of the spectral power distribution of the input signal in a user-selected frequency range lying between 0.5 Hz and 250 kHz. Note that although the display is calibrated in terms of frequency, it is not calibrated for amplitude. Hence it is only intended to assist in choosing the optimum reference frequency
Display		320 x 240 pixel (¼ VGA) color TFT display panel giving digital, analog bar-graph and graphical indication of measured signals. Menu system with dynamic key function allocation.
Signal Channel
	Voltage Input
	Modes	A only, -B only or Differential (A-B)
	Frequency Response	1 mHz < F < 250 kHz (–3dB)
	Full-scale Sensitivity	2 nV to 1 V in a 1-2-5 sequence (e.g. 2 nV, 5 nV, 10 nV, 20 nV, etc.)
	Impedance - FET input	10 MΩ // 25 pF, AC or DC coupled
	Impedance - Bipolar input	10 kΩ // 25 pF, input must be DC coupled
	Max safe input	±12.0 V
	Voltage Noise	5 nV/√Hz @ 1 kHz
	C.M.R.R.	> 100 dB @ 1 kHz degrading by no more than 6 dB/octave with increasing frequency
	Gain Accuracy	±0.5% typ, ±1.0% max
	Distortion	-90 dB THD (60 dB AC gain, 1 kHz)
	Current Input
	Mode	Low Noise (10E8 V/A) or Wide Bandwidth (10E6 V/A)
	Full-scale Sensitivity
	Low Noise	2 fA to 10 nA in a 1-2-5 sequence
	Wide Bandwidth	2 fA to 1 µA in a 1-2-5 sequence
	Frequency Response (-3 dB):
	Low Noise	1 mHz < F < 500 Hz minimum
	Wide Bandwidth	1 mHz < F < 50 kHz minimum
	Impedance
	Low Noise	< 2.5 kΩ @ 100 Hz
	Wide Bandwidth	< 250 Ω @ 1 kHz
	Noise
	Low Noise	13 fA/√Hz @ 500 Hz
	Wide Bandwidth	130 fA/√Hz @ 1 kHz
	Gain Accuracy	±2.0% typ, midband
	Either Input Mode
	Line Filter	Filter can be set to attenuate 50/60 Hz, 100/120 Hz, or both frequency bands
	Max. Dynamic Reserve	> 100 dB
	Grounding	BNC shield can be grounded or floated via 1 kΩ to ground
	Signal Monitor
	Amplitude	±1 V FS. This is the signal after preamplification and filtering, but before transmission over the optical link
	Output Impedance	1 kΩ
Reference Channel
	Reference Input
	TTL Input (rear panel)
	Frequency Range	1 mHz to 250 kHz
	Analog Input (front panel)
	Impedance	1 MΩ // 30 pF
	Sinusoidal Input
	Level	1.0 V rms*
	Frequency Range	0.5 Hz to 250 kHz
	Squarewave Input
	Level	250 mV rms
	Frequency Range	2 Hz to 250 kHz
	Reference Channel
	Phase Set Resolution	0.001° increments
	Phase Noise at 100 ms TC, 12 dB/octave slope:
	Internal Reference	< 0.0001° rms
	External Reference	< 0.01° rms @ 1 kHz
	Orthogonality	90° ± 0.0001°
	Acquisition Time
	Internal Reference	instantaneous acquisition
	External Reference	2 cycles + 1 s
	Reference Frequency Meter Resolution	4 ppm or 1 mHz, whichever is the greater
Demodulator and Output Processing
	Output Zero Stability
	Digital Outputs	No zero drift on all settings
	Displays	No zero drift on all settings
	DAC Analog Outputs	< 100 ppm/°C
	Harmonic Rejection	-90 dB
	Output Filters
	Time Constant	10 µs to 100 ks in a 1-2-5 sequence
	Slope (roll-off):
	TC < 5 ms	6 or 12 dB/octave
	TC > 5 ms	6, 12, 18 or 24 dB/octave
	Synchronous Filter	Available for F < 20 Hz
	Offset	Auto and Manual on X and/or Y: ±300% full-scale
	Phase Measurement Resolution	< 0.01º
	Reference Monitor	TTL signal at current reference frequency, internal or external
Oscillator - General
	Frequency
	Range	1 mHz to 250 kHz
	Setting Resolution	1 mHz
	Absolute Accuracy	± 50 ppm
	Amplitude
	Range	1 µV to 5 V
	Max. Setting Resolution	1 µV
	Output Impedance	50 Ω
	Sweep
	Frequency Sweep
	Output Range	1 mHz to 250 kHz
	Law	Linear or Logarithmic
	Step Rate	1 kHz maximum (1 ms/step)
	Amplitude Sweep
	Output Range	0.000 to 1.000 V rms
	Law	Linear
	Step Rate	20 Hz maximum (50 ms/step)
	Oscillator Output
	Amplitude
	Accuracy	±0.2% typ
	Stability	50 ppm/ºC
	Distortion (THD)	-80 dB @ 1 kHz and 100 mV rms
Auxiliary Inputs
	ADC 1, 2, 3 and 4
	Maximum Input	±11 V
	Resolution	1 mV
	Accuracy	±20 mV
	Input Impedance	1 MΩ // 30 pF
	Sample Rate	250 kHz maximum (one ADC only)
	Trigger Mode	Internal, External or burst
	Trigger Input	TTL compatible, rising or falling edge
Outputs
	Analog Outputs
	DAC1	X, X1, Mag2, User DAC1, Output function
	DAC2	Y, Y1, Pha2, User DAC2, Output function
	DAC3	X2, Mag, Mag1, User DAC3, Output function
	DAC4	Y2, Pha, Pha2, User DAC4, Output function
	Output Functions	Noise, Ratio, Log Ratio and User Equations 1 & 2
	Amplitude
	X(1), Y(1), Mag(1), Pha(1)	±2.5 V full-scale; linear to ±300% full-scale
	User DACs and Output Functions	±10.0 V full-scale
	Impedance	1 kΩ
	Update Rate
	X(1/2), Y(1/2), Mag(1/2), Pha(1/2) @ TC < 1 s	1.0 MHz
	User DACs, Output Functions and TC’s > 1 s	1 kHz
8-bit Digital Port
	Mode	0 to 8 lines can be configured as inputs, with the remainder being outputs
	Status	Each output line can be set high or low and the status of each input line read
	Power - Low Voltage	±15 V at 100 mA 5-pin 180° DIN connector for powering compatible SIGNAL RECOVERY preamplifiers
Data Storage Buffer
	Size	100,000 data points
	Max. Storage Rate
	Fast Mode	up to 1 MHz (X1, Y1, X2, Y2, ADC1, Demod I/P 1, Demod I/P 2)
	Normal Mode	1 kHz
User Settings
		Up to 8 complete instrument settings can be saved or recalled at will from non-volatile memory
Interfaces
		USB 2.0, Ethernet, and RS232 allow complete control of instrument settings, and data readout.
General
	Power Requirements
	Voltage	110/120/220/240 VAC
	Frequency	50/60 Hz
	Power	40 VA max
	Dimensions
	Width	15½" (390 mm)
	Depth	7¼" (185 mm)
	Height
	With feet	7¼" (185 mm)
	Without feet	6½" (170 mm)
	Weight	12.8 lb (5.8 kg)

Preliminary specifications subject to change without notice

SIGNAL RECOVERY is part of Advanced Measurement Technology, Inc, a division of AMETEK, Inc.
It includes the businesses formerly trading as EG&G Instruments (Signal Recovery),
EG&G Signal Recovery and PerkinElmer Instruments (Signal Recovery)

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Model 7270 Specifications

Model 7270
Specifications