Keysight NFA Series - Page 82

62 Chapter 2
Test Descriptions
Noise Figure Range and Accuracy
Equation 1 Range
dB
0.125 = Metrology Data
dB
at 1dB / 8
Range
dB
0.5 = Metrology Data
dB
at 1dB / 2
Range
dB
1 to 11 = Metrology Data
dB
from 1 to 11
Range
dB
12 to 22 = Metrology Data
dB
from 1 to 11 + (11dB to
re-reference)
Equation 2 Range
dB
0.125 = Measured Attenuation
dB
at 1dB / 8
Range
dB
0.5 = Measured Attenuation
dB
at 1dB / 2
Range
dB
1 to 11 = Measured Phot
dB
Ref 1 - Measured Phot
dB
from -55
to -65
Range
dB
12 to 22 = Measured Phot
dB
Ref 2 - Measured Phot
dB
from -66
to -76 + (11dB to re-reference)
NOTE The ENR values given in the calculations are taken to be 5dB, 15dB and
22dB respectively. The actual and measured attenuations supplied
within the appropriate Test Records are calculated from in the equations
in the Tables on page 63.
8-73 19
9-74 20
10 -75 21
11 -76 22
Table 2-14 Noise Figure Range and Accuracy Test Worksheet
Attenuator
Step Size (dB)
Input
Level
(dBm)
Measured
Phot (dB)
Range
(dB)
Actual
Attenuation (dB)
Equation 1
Measured
Attenuation (dB)
Equation 2