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Chapter 1, INTRODUCTION
1.3 Key Specifications and Benefits
The EG&G Instruments Model 7220 represents the latest in DSP Lock-in Amplifier
technology at an affordable price, and offers:-
n Frequency range: 0.001 Hz to 120 kHz
n Voltage sensitivity: 20 nV to 1 V full-scale
n Current input mode sensitivities: 20 fA to 1 µA full-scale
20 fA to 10 nA full-scale
n Line frequency rejection filter
n Dual phase demodulator with X-Y and R-
θθ
θθ
θ outputs
n Very low phase noise of < 0.0001
o
rms
n 5-digit output readings
n Direct Digital Synthesizer (DDS) oscillator with variable output amplitude
and frequency
n Oscillator frequency sweep generator
n Output time constant: 10 µs to 5 ks
n 8-bit programmable digital output port for system control
n Two external ADCs, two external DACs
n Full range of auto-modes
n Standard IEEE-488 and RS232 interfaces with RS232 daisy-chain
capability
n Dual back-lit liquid crystal display (LCD) with variable contrast control
n 32768 point curve storage buffer