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498 Hybrid AC Current Pre-amplifier-DC Nanoammeter Module

  • 498 modular hybrid AC current pre-amplifier-DC nanoammeter unit

In the AC mode, the 498 is deployed as a pre-amplifier for lock-in amplifiers employing current source detectors, i.e. photomultipliers and photodiodes.

In DC mode, the 498 nanoammeter represents the main detection electronic. Offering short-circuit detector operation and an impressive six decades of gain, wide dynamic range measurements with excellent linearity can be realised.

The 498 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


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


Channel 1 inputCurrent input to trans-impedance amplifier
Channel 2 inputCurrent input to trans-impedance amplifier
Gain Ranges108-103 V/A
Maximum Current Input10mA
Gain Accuracy+1%
Gain Stability200ppm/°C
Output Stability5ppm/°C to 500ppm/°C depending on sensitivity
Linearity< 0.025% departure from linearity from zero to full scale
ADC Resolution4½ digit BCD (0 to 19999) i.e. > 14 bit resolution
ADC Integration Time100ms
Input ImpedanceVirtual 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

InterfaceUSB via 417/417T Unit (I2C)
ControlFront panel/ USB
Front Panel Controlled FeaturesInput select, gain range select
DimensionsDual width module, 3U high
Connector BNC
DisplayDigital display of 417 unit, channel A

Ordering Information

S400_498498 Hybrid AC Current Pre-amplifier-DC Nanoammeter Module

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