System Overview 3
Keysight 34970A/34972A User’s Guide 87
Multiplexers are available in several types: 
– One-Wire (Single-Ended) Multiplexers for common LO measurements. For 
more information, see page 315. 
– Two-Wire Multiplexers for floating measurements. For more information, see 
page 316. 
– Four-Wire Multiplexers for resistance and RTD measurements. For more 
information, see page 317. 
– Very High Frequency (VHF) Multiplexers for switching frequencies up to 2.8 
GHz. For more information, see page 327. 
Common
Channel 1
Channel 2
Channel 4
Channel 3