Keysight Technologies 3458A Guide D'utilisation page 109

Configuring for Ratio Measurements
For ratio measurements, the multimeter measures a DC reference voltage applied
to the W Sense terminals and a signal voltage applied to the Input terminals. The
multimeter then computes the ratio as:
The signal voltage measurement function can be DC voltage, AC voltage, or
AC+DC voltage. (For AC or AC+DC voltage, any of the three measurement
methods ANA, RNDM, or SYNC may be used.) The reference voltage
measurement function is always DC voltage and has a maximum measurable
input of ±12 VDC.
The W Sense LO and the Input LO terminals must have a common reference and
NOTE
cannot have a voltage difference greater than 0.25 V.
Figure 3-5
Keysight 3458A User's Guide
Signal Voltage
Ratio = - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
DC Reference Voltage
Figure 3-5
Ratio measurement connections
Configuring for Measurements
shows the front connections for ratio measurements.
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