477 AC Current Pre-amplifier Module

  • 477 modular AC current preamplifier unit

Offering short-circuit detector operation and an impressive six decades of gain, wide dynamic range measurements with excellent linearity can be realised.

The 477 can be operated from the front panel or fully automated over the USB interface. Over-load and under-load flags are included to enhance optimal remote operation.

Core benefits


  • Single width module housed within the 417/417T unit
  • Dual input, six decade pre-amplifier
  • Pre-amplifier for lock-in amplifier
  • Virtual ground input
  • Front panel control
  • Fully programmable via USB 2.0 interface


Channel 1 input Current input to trans-impedance amplifier
Channel 2 input Current input to trans-impedance amplifier
Gain Ranges 108-103 V/A
Maximum Current Input 10mA
Gain Accuracy +1%
Gain Stability 200ppm/°C
Output Stability 5ppm/°C to 500ppm/°C depending on sensitivity
Linearity < 0.025% departure from linearity from zero to full scale
Input Impedance Virtual earth
Frequency Response 103 V/A Range (-3dB) > 1MHz
Frequency Response 104 V/A Range (-3dB) 1MHz
Frequency Response 105 V/A Range (-3dB) 260kHz
Frequency Response 106 V/A Range (-3dB) 30kHz
Frequency Response 107 V/A Range (-3dB) 23kHz
Frequency Response 108 V/A Range (-3dB) 4kHz

Interface & Mechanical

Interface USB via 417/417T Unit (I2C)
Control Front panel/ USB
Front Panel Controlled Features Input select, gain range select
Dimensions Single width module, 3U high
Connector BNC
Display Digital display of 417 unit, channel A

Ordering Information

S400_477 477 AC Current Pre-amplifier Module

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