
In the chart below, a widely used traceability path for making scattering
parameter measurements is presented. The basic elements in this chart
include a calibration kit, a VNMS, and a verification kit for each user. The
calibration kit is characterized and traceable mainly through impedance
standards, for example airlines and proper circuit modeling.
The vertical path is a process that is used by most of the manufacturers
and primary standards laboratories. It is impractical for regular users to
demonstrate the system traceablity before every use; therefore, a verifica
-
tion kit consisting of an airline, mismatch airline, and two fixed
attenuators was introduced to perform a routine check for the calibrated
system. These components were characterized by their manufacturers or
by a standards laboratory, and they have excellent repeatability charac
-
teristics.
The horizontal path shows the conventional traceability chain for the ver
-
ification kit. The stated uncertainty in the verification program comes
from three major sources:
q
NIST Report
q
Anritsu Reference Standards
q
Device-under-test
4-8 MS462XX MM
VNMS TRACEABILITY PERFORMANCE VERIFICATION
Calibration Kit
Working Standards
Calibrated VNMS
Reference Standards
Verification Kit
Working Standards
Calibrated VNMS
Reference Standards
Calibration Kit
Working Standards
Assurance Airline
(i.e., Partially Supported
Airline)
Calibrated VNMS
Reference Standards
Calibration Kit
Working Standards
NIST Airline
(i.e., Beadless Airline)
Working Standards
Verification Kit
Reference Standards
Verification Kit
Traveling Standards
Users
Anritsu National Standards
Traceability Chain
Figure 4-1. VNMS Traceability Chart
Comentários a estes Manuais