7
Tutorial
328
Keysight 34970A/34972A User’s Guide
Sources of Error in RF Switching
Impedance mismatching can cause a variety of errors in an RF multiplexing
system. These errors can cause distorted waveforms, overvoltage, or
undervoltage conditions.
To minimize RF impedance mismatching:
– Use the correct cable and connector for the circuit impedance (50
Ω
or 75
Ω
).
Note that it is difficult to visually differentiate a 50
Ω
connector from a 75
Ω
connector.
– Be sure that all leads and signal paths are properly terminated. Unterminated
sections of line can appear as near shorts at RF frequencies. Note that the
34905A and 34906A
do not
automatically terminate open channels.
Insertion Loss (75
Ω
)
Insertion Loss (50
Ω
)
VSWR (50
Ω
)
VSWR (75
Ω
)
Direct to Module
Using provided adapter cables
