N1922A Datasheet, PDF (11/14 Pages) Keysight Technologies – Wideband Power Sensors

11 | Keysight N1911A/N1912A P-Series Power Meters and N1921A/N1922A Wideband Power Sensors - Data Sheet
Graphical Example
A. System contribution to measurement uncertainty versus power level (equates to step 6 result/2)
100.0%
System uncertainty contribution - 1 sigma (%)
10.0%
N1921A: 500 MHz to 10 GHz
N1922A:18 to 40 GHz
Other bands
1.0%
-35 -30 -25 -20 -15 -10 -5 0
Power (dBm)
5 10 15 20
Note: This graph is valid for condi-
tions of free-run operation, with a
signal within the video bandwidth
setting on the system.
Humidity < 70%.
B. Standard uncertainty of mismatch.
0.5
0.45
0.4
0.35
0.3
0.25
0.2
0.15
0.1
0.05
0
0
Standard uncertainty of mismatch - 1 sigma (%)
0.1
0.2
0.3
0.4
0.5
r_DUT
SWR ρ
1.0 0.00
1.05 0.02
1.10 0.05
1.15 0.07
1.20 0.09
1.25 0.11
1.30 0.13
1.35 0.15
1.40 0.17
1.45 0.18
1.5 0.20
1.6 0.23
1.7 0.26
SWR ρ
1.8 0.29
1.90 0.31
2.00 0.33
2.10 0.35
2.20 0.38
2.30 0.39
2.40 0.41
2.50 0.43
2.60 0.44
2.70 0.46
2.80 0.47
2.90 0.49
3.00 0.50
Note: The above graph shows the standard uncertainty of mismatch = ρDUT. ρSensor / ←2, rather than the mismatch uncertainty
limits. This term assumes that both the source and load have uniform magnitude and uniform phase probability distributions.
C. Combine A & B
U_C =
(Value from Graph A)²+ (Value from Graph B)²
Expanded Uncertainty, k = 2, = 2. U_C = . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±
%