  The axion search experiments based on haloscopes at the Center for Axion and
Precision Physics Research (CAPP) of the Institute for Basic Science (IBS) in
South Korea are performed in the frequency range from 1 GHz to 6 GHz. In order
to perform the experiments in a strong magnetic field of 12 T and a
large-volume cavity of close to 40 liters, we use He wet dilution refrigerators
with immersed superconducting magnets. The measurements require continuous
operation for months without interruptions for microwave component
replacements. This is achieved by using different cryogenic engineering
approaches including microwave RF-switching. The critical components, defining
the scanning rate and the sensitivity of the setup, are the Josephson
parametric amplifiers (JPA) and cryogenic low noise amplifiers (cLNA) based on
high-electron-mobility-transistor (HEMT) technology. It is desirable for both
devices to have a wide frequency range and low noise close to the quantum limit
for the JPA. In this paper, we show a recent design of a 4-channel measurement
setup for JPA and HEMT measurements. The setup is based on a 4-channel wideband
noise source (NS) and is used for both JPA and HEMT gain and noise
measurements. The setup is placed at 20 mK inside the dry dilution
refrigerator. The NS is thermally decoupled from the environment using plastic
spacers, superconducting wires and superconducting coaxial cables. We show the
gain and noise temperature curves measured for 4 HEMT amplifiers and 2 JPAs in
one cool-down
