Specifications

Figure 2-16. Comparison of typical Q accuracy
2-7. Key measurement functions
2-7-1. OSC level
The oscillator output signal is output through the coaxial test port (coaxial connector) with source
impedance of 50 Ω. The oscillator output level can be controlled to change the test signal level
applied to the DUT. Specified test signal level is obtained when the connector is terminated with a
50 Ω load (The signal level for open or short condition is calculated from that for 50 Ω). When a
DUT is connected to the measurement terminals, the current that flows through the DUT will cause
a voltage drop at the 50 Ω source impedance (resistive). Actual test signal level applied to the
device can be calculated from the source impedance and the DUT’s impedance as shown in Figure 2-
6. Those instruments equipped with level monitor function can display the calculated test signal
level and measurement results.
2-7-2. Test port
The test port of the RF I-V instrument usually employs a precision coaxial connector to ensure opti-
mum accuracy throughout high frequency range. The coaxial test port allows RF test fixtures to be
attached and the instrument to be calibrated using traceable coaxial standard terminations. The
test port is a two-terminal configuration and does not have a guard terminal separate from a ground
terminal. Therefore, the guarding technique does not apply as well to the RF I-V measurements as
compared to network analysis.
2-20