Models 7280 and 7280BFP
Specifications

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

		7280	7280BFP

General		Dual-phase DSP lock-in amplifiers operating over a reference frequency range of 0.5 Hz to 2.0 MHz. Direct digital demodulation using a main ADC sampling rate of 7.5 MHz. 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	The following outputs are available: X In-phase Y Quadrature R Magnitude Θ Phase Angle Noise
	Harmonic Detection	nF, n ≤ 32
	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
	Frequency Ranges for Dual Harmonic and Dual Reference Modes:
	Standard Unit	F1 and F2 ≤ 20 kHz
	With option -/99	F1 and F2≤ 800 kHz
	With option -/98	F1 and F2 ≤2.0 MHz
	Virtual Reference	Locks to and detects a signal without a reference (100 Hz ≤ F ≤ 2.0 MHz)
	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 1 Hz and 2.0 MHz. 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	Not available
Display		320 ´ 240 pixel (¼ VGA) electroluminescent panel giving digital, analog bar-graph and graphical indication of measured signals. Menu system with dynamic key function allocation. On-screen context sensitive help	Not fitted
Signal Channel
	Voltage Input
	Modes	A only, -B only or Differential (A-B)
	Full-scale Sensitivity
	0.5 Hz ≤ F ≤ 250 kHz	10 nV to 1 V in a 1-2-5 sequence
	250 kHz < F ≤ 2.0 MHz	100 nV to 1 V in a 1-2-5 sequence
	Max. Dynamic Reserve	> 100 dB
	Impedance	100 MΩ // 25 pF
	Maximum Safe Input	20 V pk-pk
	Voltage Noise	5 nV/√Hz @ 1 kHz
	C.M.R.R.	> 100 dB @ 1 kHz
	Frequency Response	0.5 Hz to 2.0 MHz
	Gain Accuracy	±0.3% typ, ±0.6% 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 kΩ 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 µA in a 1-2-5 sequence
	Wide Bandwidth
	F ≤ 250 kHz	1 pA to 100 µA in a 1-2-5 sequence
	F > 250 kHz	10 pA to 100 µA in a 1-2-5 sequence
	Max. Dynamic Reserve	> 100 dB
	Frequency Response (-3 dB):
	Low Noise	≥ 500 Hz
	Normal	≥ 50 kHz
	Wide Bandwidth	≥ 1 MHz
	Impedance
	Low Noise	< 2.5 kΩ @ 100 Hz
	Normal	< 250 Ω @ 1 kHz
	Wide Bandwidth	< 25 Ω @ 10 kHz
	Noise
	Low Noise	13 fA/√Hz @ 500 Hz
	Normal	130 fA/√Hz @ 1 kHz
	Wide Bandwidth	1.3 pA/√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 kΩ to ground
Reference Channel
	TTL Input
	Frequency Range	0.5 Hz to 2.0 MHz
	Analog Input
	Impedance	1 MΩ // 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° 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 + 50 ms
	Reference Frequency Meter Resolution	1 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	Not Available
	Analog Outputs	< 5 ppm/°C
	Harmonic Rejection	-90 dB
	Output Filters
	X, Y and R outputs only
	Time Constant	1 µs to 1 ms in a 1-2-5 sequence, and 4 ms
	Slope (roll-off)	6 and 12 dB/octave
	All outputs
	Time Constant	500 µs to 100 ks in a 1-2-5 sequence
	Slope	6, 12, 18 and 24 dB/octave
	Synchronous Filter	Available for F < 20 Hz
	Offset	Auto and Manual on X and/or Y: ±300% full-scale
	Absolute Phase Measurement Accuracy	≤ 0.01°
Oscillator
	Frequency
	Range	0.5 Hz to 2.0 MHz
	Setting Resolution	1 mHz
	Absolute Accuracy	± 50 ppm
	Distortion (THD)	-80 dB @ 1 kHz and 100 mV rms
	Amplitude (rms)
	Range	1 mV to 1 V
	Setting Resolution	1 mV
	Accuracy	±0.2%
	Stability	50 ppm/°C
	Output Impedance	50 Ω
	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	1 kHz maximum (1 ms/step) @ output time constant settings of 500 µs or longer; 140 ms/point otherwise
Auxiliary Inputs
	ADC 1, 2, 3 and 4
	Maximum Input	±10 V
	Resolution	1 mV
	Accuracy	±20 mV
	Input Impedance	1 MΩ // 30 pF
	Sample Rate
	ADC 1 only	40 kHz max.
	ADC 1 and 2	17.8 kHz max.
	Trigger Mode	Internal, External or burst
	Trigger Input	TTL compatible
Outputs
	Main Analog (CH1 and CH2) Outputs:
	Function	X, Y, R, Θ, Noise, Ratio, Log Ratio and User Equations 1 & 2.
	Amplitude	±2.5 V full-scale; linear to ±300% full-scale
	Impedance	1 kΩ
	Update Rate
	X, Y or R @ TC £ 4 ms	7.5 MHz
	All outputs @ TC ³ 500 µs	1 kHz
	Signal Monitor
	Amplitude	±1 V FS
	Impedance	1 kΩ
	Auxiliary D/A Output 1 and 2:
	Maximum Output	±10 V
	Resolution	1 mV
	Accuracy	±10 mV
	Output Impedance	1 kΩ
	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 low and each 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	±15 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 1×32k, 2×16k, 3×10.6k, 4×8k, 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
		RS232 and GPIB (IEEE-488). A second RS232 port is provided to allow "daisy-chain" connection and control 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	17¼" (435 mm)
	Depth	19" (485 mm)
	Height
	With feet	6" (150 mm)
	Without feet	5¼" (130mm)
	Weight	25.4 lb (11.5 kg)

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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Models 7280 and 7280BFP Specifications

Models 7280 and 7280BFP
Specifications