R&S ZNB Series User Manual page 264

®
R&S ZNB/ZNBT
Table 4-26: PAE measurement types
Measurement type /
Circuit diagram
Constant voltage source
Constant current source
Voltage and current
User Manual 1173.9163.02 ─ 62
Concepts and features
Optional extensions and accessories
Input parameters /
Description
U , R
0
The DC power supply provides a constant
voltage U ; a precision resistor R is connec-
0
ted in series to the DUT. A single measure-
ment of the DC voltage at the DUT U
vides the current and hence the DC input
power:
  
P U I U
DC m m
I
0
The DC power supply provides a constant
current I ; the DC voltage at the DUT U
0
measured. This provides the DC input power:
 
P U I
DC m 0
R
Voltage and current of the DC power supply
can be both unknown; a precision resistor R
is connected in series to the DUT. Two simul-
taneous DC voltage measurements provide
the DC input power:
  
P U I U
DC m 1 m 1
pro-
m

U U

0 m
R
is
m

U U

m 2 m 1
R
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