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10-4
Determining System Measurement Uncertainties
Sources of Measurement Errors
Sources of Random Errors
The random error sources are noise, connector repeatability and interconnecting cable
stability. There are two types of noise in any measurement system: low level noise (noise
floor) and high level noise (trace noise).
Low level noise is the broadband noise floor of the receiver which can be reduced through
averaging or by changing the IF bandwidth.
High level noise or trace noise is due to the noise floor, the phase noise of the LO source
inside the test set, or by reducing the IF bandwidth.
Connector repeatability is the random variation encountered when connecting a pair of RF
connectors. Variations in both reflection and transmission can be observed.
Cable stability is dependant on the cable used and the amount of cable movement between
calibration and measurement.
The listing below shows the abbreviations used for random errors in the error models and
uncertainty equations.
• N
F
= noise floor
• N
T
= trace noise
• C
R1
= port 1 cable reflection stability
• C
TM1
= port 1 cable magnitude transmission stability
• C
TP1
= port 1 cable phase transmission stability
• C
R2
= port 2 cable reflection stability
• C
TM2
= port 2 cable magnitude transmission stability
• C
TP2
= port 2 cable phase transmission stability
• R
R1
= port 1 connector reflection repeatability
• R
T1
= port 1 connector transmission repeatability
• R
R2
= port 2 connector reflection repeatability
• R
T2
= port 2 connector transmission repeatability
Summary of Contents for 8719ES
Page 6: ...vi ...
Page 10: ...Contents x Contents ...
Page 11: ...1 1 1 HP 8719 20 22ES Specifications and Characteristics ...
Page 60: ...1 50 HP 8719 20 22ES Specifications and Characteristics Instrument Specifications ...
Page 61: ...2 1 2 HP 8719 20 22ET Specifications and Characteristics ...
Page 98: ...2 38 HP 8719 20 22ET Specifications and Characteristics Instrument Specifications ...
Page 99: ...3 1 3 Front Rear Panel ...
Page 111: ...4 1 4 Menu Maps ...
Page 113: ...4 3 Menu Maps Menu Maps Figure 4 2 Menu Map for Copy ...
Page 114: ...4 4 Menu Maps Menu Maps Figure 4 3 Menu Map for Display ...
Page 115: ...4 5 Menu Maps Menu Maps Figure 4 4 Menu Map for Format Figure 4 5 Menu Map for Local ...
Page 116: ...4 6 Menu Maps Menu Maps Figure 4 6 Menu Map for Marker Marker Fctn and Marker Search ...
Page 118: ...4 8 Menu Maps Menu Maps Figure 4 9 Menu Map for Power and Sweep Setup ET only ...
Page 119: ...4 9 Menu Maps Menu Maps Figure 4 10 Menu Map for Power and Sweep Setup ES only ...
Page 120: ...4 10 Menu Maps Menu Maps Figure 4 11 Menu Map for Preset ...
Page 121: ...4 11 Menu Maps Menu Maps Figure 4 12 Menu Map for Save Recall ...
Page 122: ...4 12 Menu Maps Menu Maps Figure 4 13 Menu Map for Scale Ref ...
Page 128: ...5 1 5 Hardkey Softkey Reference ...
Page 194: ...6 1 6 Error Messages ...
Page 222: ...7 1 7 Options and Accessories ...
Page 234: ...8 1 8 Preset State and Memory Allocation ...
Page 253: ...8 20 Preset State and Memory Allocation Memory Allocation ...
Page 254: ...9 1 9 Understanding the CITIfile Data Format ...
Page 269: ...9 16 Understanding the CITIfile Data Format Useful Calculations ...
Page 270: ...10 1 10 Determining System Measurement Uncertainties ...
Page 281: ...10 12 Determining System Measurement Uncertainties Measurement Uncertainty Equations ...