Here are the most popular threads on EDAboard this week pertaining to test and measurement topics:
Measuring an RF transceiver: I have a low-noise mixer IF amplifier and IF filter on the PCB. I want to measure signal power, return loss, insertion loss on the PCB. What is the best solution for this? Should I put a directional coupler at every test point? Are there other ways to measure the signal? Read more
Measuring an antenna’s axial ratio – The definition of an antenna’s axial ratio of an antenna is the ratio of orthogonal components of its E-field, and applies mainly to antennas that are circularly polarized. I know how to get the axial ratio (dB vs frequency graph) from he electromagnetic simulation software CST Studio. Now if I measure the far-field patterns of my fabricated antenna in an EMC chamber, how do I calculate the axial ratio from (dB vs scanning angle) data I get from measurements? Read more.
Wrong parameters for a rectangular waveguide — I have designed a simple rectangular waveguide on the Ansys HFSS software for simulating 3-D full-wave electromagnetic fields. The results are wrong. Parameter S1 1 should be 0 dB as we are talking about the reflection coefficient from port 1… Am I missing something? There is finite conductivity to four surfaces, two ports for my wavefrom. Vacuum inside. Any clues? Read more.
Testing for phase shift – I’m using the ADD mode on an oscilloscope to add two channels to test for phase shift of parallel circuits on identical stages. For the in-phase test, both input signals have the same input frequency and voltage. Both outputs should have no phase shift between the two output channels For the out-of-phase test, one input is in-phase and the second input is 180° out of phase. Both outputs should have a straight horizontal line on the scope if there is a phase difference between the two outputs. What else can you use the ADD mode on the scope for? Read more.
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