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Error Correction:
Perform software-guided 12 term calibration.
Special Precautions: When performing the procedures in this chapter, observe the following
precautions:
q
Minimize vibration and movement of system and attached compo
-
nents and through-cable.
q
Clean and check pin depth and condition of all adapters,
through-cable(s), and calibration components.
q
Pre-shape the through-cable(s) so as to minimize its movement dur
-
ing calibration and measurement activities.
q
Ensure the system remains motion free in stable environmental
conditions as defined above throughout warm-up, calibration, and
measurement activities.
4-3 MEASUREMENT
ACCURACY
The verification procedures described in the following paragraphs verify
the published measurement accuracy and measurement traceability* for
the 373XXA.
Verification Software These procedures use the ANRITSU VNA Verification Software, PN:
2300-237, and the NIST traceable impedance transfer standards con-
tained in the appropriate ANRITSU Verification Kit. The Standard Con-
ditions and Special Precautions described in paragraph 4-2 should be
observed when performing these procedures.
The appropriate ANRITSU Verification Kit to be used for performing
these procedures is model dependent, as follows:
q
Models 37317A and below, with Opt 7A: Verification Kit 3667
q
All Models using K Connector test ports: Verification Kit 3668
q
Models 37397A: Verification Kit 3669B
The impedance transfer standards contained in these kits are:
q
20 dB Attenuation Standard
q
50 dB Attenuation Standard
q
50 Ohm Air Line Standard
q
25 Ohm Mismatch (Beatty) Standard
The verification software performs the following functions:
q
It guides the user through a full 12 Term calibration of the 373XXA.
q
It guides the user through the measurement of the S-parameters of
the NIST traceable impedance transfer standards (below).
q
It verifies the measured values are within the specified measure
-
ment uncertainty limits.
q
It indicates the pass/fail status of the measurements on the CRT
display. It can also provide a hard copy printout of the measured
MEASUREMENT ACCURACY PERFORMANCE VERIFICATION
4-4 373XXA MM
∗ Traceability to the U.S. National Institute of Standards and Technology (NIST)