Speciality cables from FEMTO

Why are special cables required?

In precision measurement technology, the overall performance of a system is not solely determined by amplifier specifications. The connecting cable between the signal source and the amplifier is an integral part of the signal path. Particularly with ultra-low-noise current amplifiers (transimpedance amplifiers – TIAs), unsuitable cables can massively degrade the signal-to-noise ratio (SNR). Therefore, FEMTO offers special cables for various applications. Using these cables at the amplifier's input and output can lead to an overall significantly more accurate and less noisy measurement setup.

Which cable for which amplifier input?

To simplify cable selection for connecting the source, please use the following matrix based on your FEMTO amplifier model

Amplifier
Series		 Typical
Application		 Recommended
FEMTO cable		 Why?
LCA
DLPCA-200
DDPCA-300		 Current measurement, high gains (>105) with bandwidths below 1 MHz Low-Noise Eliminates vibration artefacts at high gains
Low-Capacitance For cable lengths over 1 m in a mechanically undisturbed environment, to minimise capacitively induced noise
HCA
DHPCA-100		 Current measurement, bandwidths of 1 MHz until 100 MHz Low-Capacitance Keeps the capacitively conditioned noise floor flat at high frequencies
RF cable For 50 Ω Impedance matching and/or in an electromagnetically disturbed environment
DLPVA
HVA
DHPVA
HSA
DUPVA		 Voltage measurement, bandwidths from DC to GHz RF cable The source capacity plays a subordinate role, focus on maximum EM shielding and 50 Ω impedance matching
Lock-In-Amplifiers Lock-In Detection Low-Noise In a mechanically disturbed environment (vibrations)
RF cable In an electromagnetically stressed environment

Which cable for the output?

For connecting our amplifiers and photodetectors to the signal receiver (e.g. oscilloscope or ADC card), we recommend without exception our RF cable, to minimise interference.