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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