2.3.2 Setup Configurations – Side-by-Side

The measurement requires a configuration point-to-point that simulates a transmission path between a tester and the DUT. The setup is ready to connect a digital attenuator (controlled through Virtual Instrument Software Architecture VISA) in the middle to simulate a transmission path with different attenuations to measure transmission power or sensibility. There are two different configurations of the setups:

  • Configuration A. DUT and reference device connected to CENELEC CISPR16-1 LISN (High Impedance Mode). Mostly used on laboratory and certification processes. See Figure 2-5.
  • Configuration B. DUT and reference device connected to PRIME Adaptation LISN (Low Impedance Mode). Mostly similar to real network scenario in the field. See Figure 2-6.

Both of these setup configurations are described in the next figures.

Figure 2-5. Configuration A: Side by Side Setup with DUT in High Impedance Mode
Figure 2-6. Configuration B: Side by Side Setup with DUT in Low Impedance Mode

Additional fixed attenuators are recommended at the output of LISNs (3 dB in each device) and at the ports of the Digital Attenuator (6 dB in each port) to reduce the possibility of breaking them when the value of the attenuator is changed during the tests. In addition, a guard time in any transmission must be included before and after reprogramming the digital attenuator.