Concepts and Features
R&S
®
ZNB/ZNBT
221
User Manual 1173.9163.02 ─ 38
Table 4-24: PAE measurement types
Measurement type /
Circuit diagram
Input parameters /
Description
Constant voltage source
U
0
, R
The DC power supply provides a constant
voltage U
0
; a precision resistor R is connec-
ted in series to the DUT. A single measure-
ment of the DC voltage at the DUT U
m
pro-
vides the current and hence the DC input
power:
R
U
U
U
I
U
P
m
m
m
DC
0
Constant current source
I
0
The DC power supply provides a constant
current I
0
; the DC voltage at the DUT U
m
is
measured. This provides the DC input power:
0
I
U
P
m
DC
Voltage and current
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
simultaneous DC voltage measurements pro-
vide the DC input power:
R
U
U
U
I
U
P
m
m
m
m
DC
1
2
1
1
Optional Extensions and Accessories
