Rohde & Schwarz NRP2, User Manual

Page: 111 / 419

Instrument Functions
NRP2
108 User Manual 1173.9140.02 ─ 07
Table 4-5: Formulas for sum and difference of power
Function
Unit
W dBm db
μ
V
Sum (A+B)
B A
P P








mW 1
lg 10 B A
P P
 








 
V μ 1
lg 20
Z P P
B A
Diff (A-B)
B A
P P








mW 1
lg 10
B A
P P
 








 
V μ 1
lg 20
Z P P
B A
Table 4-6: Formulas for relative measurement
Function
Unit
1 dB
Δ
%
Single
R
P
P






R
P
P
lg 10







1 100
R
P
P
Sum
Diff
R
B A
P
P P








mW 1
lg 10
B A
P P








1 100
R
B A
P
P P
Ratio
R
Y
X
B
A
P
P
P
P












R
Y
X
B
A
P
P
P
P












lg 10





















1 100
R
Y
X
B
A
P
P
P
P
Table 4-7: Legend for formula tables
Variable Meaning
P
P
A
P
B
P
R
(P
X
/ P
Y
)
R
Z
Power
Power in channel A (incident power)
Power in channel B (reflected power)
Reference (power)
Reference (power ratio)
Characteristic impedance, i.e. 50
Ω
Unit
The "Unit" drop-down list is used to set the result unit. Units that are provided for the
selected measurement function:
"W" Single, Diff, Sum
"dBm | dB
μ
V" Single, Diff, Sum
"
Δ
% | dB | 1" Ratio
Configuring measurements
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