1.3 Key Specifications and Benefits
The SIGNAL RECOVERY Model 7270 represents a further significant advance in
the application of DSP technology in the design of a lock-in amplifier.
Key specifications include:
Frequency range:
Voltage sensitivity:
Current input mode sensitivities:
Line frequency rejection filter
Dual phase demodulator with X-Y and R- outputs
Very low phase noise of < 0.0001
Output time constant:
5-digit output readings
Dual reference mode - allows simultaneous measurement of two signals at
different reference frequencies.
Single and dual harmonic mode - allows simultaneous measurement of up to two
different harmonics of a signal
Tandem demodulation capability - suitable for double demodulation experiments
that would previously have required two lock-in amplifiers
Spectral Display mode shows frequency spectrum of the signal prior to the
demodulators to help in selecting a reference frequency
Virtual reference mode - allows reference free measurements
Direct Digital Synthesizer (DDS) oscillator with variable amplitude and
frequency
Oscillator frequency and amplitude sweep generator
Voltage controlled oscillator frequency or amplitude
8-bit programmable digital I/O port for external system control
Four configurable DAC outputs which can be used as analog signal outputs
and/or as auxiliary DAC outputs
Four auxiliary ADC inputs
Full range of auto functions
Non-volatile memory for 8 complete instrument settings
Standard USB, Ethernet, and RS232 interfaces with RS232 daisy-chain
capability for up to 16 instruments.
Large high-resolution color LCD display panel with menus for control and
display of instrument outputs in both digital and graphical formats
Easy entry of numerical control settings using keypad
100,000 point internal curve storage buffer
Chapter 1, INTRODUCTION
0.001 Hz to 250.000 kHz
2 nV to 1 V full-scale
2 fA to 1 µA full-scale
2 fA to 10 nA full-scale
°
rms
10 µs to 100 ks
1-3