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Производитель: Signal Recovery
Синхронный усилитель SR 7265 предлагает пользователю возможности двухфазного выделения поданного сигнала на опорной частоте, но также присущие только оборудованию SIGNAL RECOVERY возможности детектирования в режимах парных опорных сигналов и парных гармоник, позволяющим измерять сигналы одновременно на двух разных частотах (Dual Reference), а также тандемную демодуляцию. Синхронный усилитель SR 7265 также позволяет использовать режим виртуального опорного сигнала (Virtual Reference™), что в ряде случаев позволяет выполнять измерения без опорных сигналов.
Обладая рабочим диапазоном частот 1 мГц ÷ 250 кГц, модель 7265 обладает чувстительностью по напряжению до 2 нВ и по току до 2 фА во всём диапазоне. Прибор предлагает несколько режимов работы, специальные возможности по восстановлению сигнала или эксплуатацию в качестве векторного вольтметра, а использование методов цифровой обработки сигнала позволяет добиться исключительных рабочих характеристик.
Характеристики
Документация
General
Dual-phase DSP lock-in amplifier operating over a reference frequency range of 0.001 Hz to 250 kHz.
Wide range of extended measuring modes and auxiliary inputs and outputs.
User-upgradeable firmware.
| Measurements Modes The instrument can simultaneously show any four of these outputs on the front panel display: X In-phase Y Quadrature R Magnitude ø Phase Angle |
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| Noise | |
| Harmonic | nF, n≤ 65, 536 |
| Dual Harmonic Simultaneously measures the signal at two different harmonics F1 and F2of the reference frequency |
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| Dual Reference Simultaneously measures the signal at two different reference frequencies, F1 F2 where F1 is the external and F2the internal reference |
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| Frequency Range for Dual Harmonic and Dual Reference Modes | F1 and F2 ≤ 20 kHz |
| Virtual Reference Locks to and detects a signal without a reference (100 Hz ≤ F ≤ 250 kHz) |
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| Noise Measures noise in a given bandwidth centered at the reference frequency F |
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| 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 60 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 |
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| Display 240 x 64 pixel cold fluorescent backlit LCD panel giving digital, analog bar- graph and graphical indication of measured signals. Menu system with dynamic key function allocation. On- screen context sensitive help |
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| Signal Channel | |
| Voltage Input Modes |
A only, -B only or Differential (A-B) |
| Full-scale Sensitivity | 2 nV to 1 V in a 1-2-5 sequence |
| Max. Dynamic Reserve | > 100 dB |
| Impedance FET Input Bipolar Input |
10 MΩ // 30 pF 10 kΩ // 30 pF |
| Maximum Safe Input | 20 V pk-pk |
| Voltage Noise FET Input Bipolar Input |
5 nV/√Hz @ 1 kHz 2 nV/√Hz @ 1 khZ |
| C.M.R.R. | > 100 dB @ 1 kHz |
| Frequency Response | 0.001 Hz to 250 kHz |
| Gain Accuracy | ±0.2% typ |
| 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 or Wide Bandwidth |
| Full-scale Sensitivity Low Noise Wide Bandwidth |
2fA to 10 nA in a 1-2-5 sequence 2 fA to 1 µA in a 1-2-5 sequence |
| Max. Dynamic Reserve | > 100 dB |
| Frequency Response | (-3 dB) |
| Low Noise Wide Bandwidth |
> 500 Hz ≥ 50 kHz |
| Impedance Low Noise Wide Bandwidth |
< 2.5 kΩ ! 100 Hz <250 Ω @ 1 kHz |
| Noise Low Noise Wide Bandwidth |
13 fA/√Hz @ 500 Hz 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 (rear panel) Frequency Range |
0.001 Hz to 250 kHz |
| Analog Input (front panel) Impedance Sinusoidal input Level Frequency Range Squarewave input Level Frequency Range |
1 MΩ // 30 pF 1.0 V rms* 0.3 Hz to 250 kHz 250 mV rms* 2 Hz to 250 kHz |
| *Note: Lower levels can be used with the analog input at the expense of increased phase errors | |
| Phase Set Resolution | 0.001º increments |
| Phase Noise at 100 ms TC, 12 dB/octave slope Internal Reference External Reference |
< 0.001º rms <0.01º rms @ 1 kHz |
| Orthogonality | 90º ±0.001º |
| Acquistion 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 Displays Analog Outputs |
No zero drift on all settings No zero drift on all settings < 5 ppm/ºC |
| Harmonic Rejection | -90 dB |
| Output Filters X, Y and R outputs only Time Constant Slope (roll-off) All outputs Time Constant Slope |
10 µs to 640 µs in a binary sequence 6 dB/octave 5 ms to 100 ks in a 1-2-5 sequence 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 | ≤0.01º |
| Oscillator | |
| Frequency Range Setting Resolution 1 mHz ≤ F ≤ 900 Hz F . 900 Hz Absolute Accuracy |
0.001 Hz to 250 kHz 1 mHz 4 mHz ± 50 ppm |
| Distortion (THD) | -80 dB @ 1 kHz and 100 mV rms |
| Amplitude (rms) Range 1µV to 4 mV 4 mV to 500 mV 500 mV to 2 V 2 V to 5 V Accuracy > 1 mV 100 µV - 1 mV Stability |
1 µV to 5 V rms 1µV 125 µV 500 µV 1.25 mV ±0.3%, F ≤ 60 kHz, ±0.5%, F > 60 kHz ±1%,F ≤ 60 kHz, ±3%, F > 60 kHz 50 ppm/ºC |
| Output Impedance | |
| Sweep Amplitude Sweep Output Range Law Step Rate |
0.001 to 5.000 V rms Linear 20 Hz maximum (50 ms/step) |
| Frequency Sweep Output Range Law Step Rate |
0.001 Hz to 250 kHz Linear or Logarithmic 20 Hz maximum (50 ms/step) |
| Auxiliary Inputs | |
| ADC 1 & 2 Maximum input Resolution Accuracy Input Impedance Smple Rate ADC 1 only ADC 1 and 2 Trigger Mode Trigger Input |
±10 V 1 mV ±20 mV 1 MΩ // 30 pF 40 kHz max. 17.8 kHz max. Internal, External or burst TTL compatible |
| ADC 3 Maximum input Resolution Input Impedance Sampling Time |
±10 V 12 to 20 bit, depending on sampling time 1 MΩ // 30 pF 10 ms to 2 s, variable |
| Outputs | |
| Fast Outputs Function Amplitude Impedance Update Rate |
X and Y or X and Mag ±2.5 V full-scale; linear to ±300% full-scale 1 kΩ 166 kHz |
| Main Analog (CH1 and CH2) Outputs Function Amplitude Impedance Update Rate |
X, Y, R, ø, Noise, Ratio, Log Ratio and User Equations 1 & 2. ±10.0 V full-scale; linear to ±120% full-scale 1 kΩ 200 Hz |
| Signal Monitor Amplitude Impedance |
±10 V FS 1 kΩ |
| Auxiliary D/A Outputs 1, 2, 3 and 4 Maximum Output Resolution Accuracy Output Impedance |
±10 V 1 mV ±10 mV 1 kΩ |
| 8-bit Digital Output Port 8 TTL-compatible lines that can be independently set high or low to activate exteranl equipment |
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| Reference Output Waveform Impedance |
0 to 5 V rectangluar wave TTL-campatible |
| Power - Low Voltage | ±15 V at 100 mA rear panel 5-pin 180º DIN connector for powering SIGNAL RECOVERY preamplifiers |
| Data Storage Buffer Size Max Storage Rate From LIA From ADC1 |
32k x 16-bit data points, may be organized as 1x32k, 2x16k, 3x10.6k, 4x8k, etc. up to 1000 16-bit values per second up to 40,000 16-bit values per second |
| User Settings Up to 8 complete instrument settings can be saved or recalled from non-volatile memory |
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| Interfaces RS232 and GPIB (IEEE-488). A second RS232 port is provided to allow "daisy- chain" connection and control of up to 16 compatible instruments from a single RS232 computer port |
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| General Power Requirements Voltage Frequency Power |
110/120/220/240 VAC 50/60 Hz 40 VA max |
| Dimensions Width Depth Height With feet Without feet |
13¼" (350 mm) 16½" (415 mm) 4¼" (105 mm) 3½" (90 mm) |
| Weight | 18 lb (8.1 kg) |
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