EG&G Instruments 7220 DSP Lock-in Amplifier Instruction Manual

Below you will find brief information for 7220. This manual details setup and operation of the EG&G Instruments Model 7220 Digital Signal Processing (DSP) dual-phase lock-in amplifier. It covers installation, initial checks, technical descriptions, front/rear panel operation, and computer control via GPIB and RS232 interfaces. The device functions as an AC signal recovery instrument, vector voltmeter, phase meter, spectrum analyzer, transient recorder, precision oscillator, frequency meter, and noise measurement unit.

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EG&G Instruments 7220 Lock-in Amplifier Manual | Manualzz

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Key features

  • Frequency range: 0.001 Hz to 120 kHz
  • High voltage and current sensitivity
  • Dual-phase demodulator with X-Y and R-θ outputs
  • Very low phase noise (< 0.0001° rms)
  • Auto-modes for simplified operation
  • IEEE-488 and RS232 interfaces
  • Dual backlit LCD displays
  • 32768-point curve storage buffer

Frequently asked questions

A lock-in amplifier recovers signals buried in noise or provides high-resolution measurements of relatively clean signals across a wide frequency range. The Model 7220 has expanded capabilities for various scientific measurements.

The 7220 can operate from 90-110V, 110-130V, 200-240V, and 220-260V at 50-60Hz. The voltage range is selectable via an internal switch.

The manual provides a procedure involving setting the line voltage, powering on the unit, checking the initial display messages, accessing the setup menu, and using the default setting function. A test with the internal oscillator is also included.

The signal input amplifier can be configured for single-ended or differential voltage mode, or single-ended current mode operation, offering AC or DC coupling (voltage mode) and selectable gains (current mode).
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