HP 85029B 7mm Verification Kit
Intended Uses
System
Verification.
Measuring the devices of this kit and comparing the results with supplied data
provides a tops-down verification of an HP
with a 7 mm 50 ohm test set. The frequency range
covered by the HP 850298 is 300
to 6
The system must be calibrated before performing a
system verification.
A tops-down verification is a procedure in which the devices in a verification kit are measured on the HP
system. These measured values are then compared with the NBS traceable data that
Packard supplies with each verification kit. The HP 850298 verification kit contains three verification
devices for this purpose. The kit contains a 7 mm 20
attenuator, a 7 mm 50
attenuator, and a 7
mm mismatch attenuator. NBS traceable magnitude and phase data is provided with the HP 850298
verification kit at specific frequencies from 300
to 6
for all four S-parameters
The uncertainty limits provided with these verification devices is the worst case sum of the measure-
ment uncertainties of the factory HP 850298 production test system plus the measurement uncertain-
ties of the system being verified. If the measured data for the verification devices falls within the
supplied uncertainty limits, then the measurement system passes its performance verification.
Residual errors of the measurement system are, in part, due to the characteristics of the calibration
devices
used during system calibration. You should use the same calibration kit that will be
used when
calibrating the system for actual measurements. Using a different calibration kit can cause inconsistent
performance. Example: A user calibrates the system with a calibration kit that is in excellent condition
and the system passes the verification procedure easily. The system is then sent to production and is
calibrated using a worn or damaged calibration kit. In this case, the residual errors of the system could
fall outside the allowable uncertainty limits.
Each HP 850298 verification kit is measured at the factory in a tightly controlled environment using an
HP 8753. The test system is calibrated with special NBS-traceable standards, allowing the accuracy of
the test system to exceed that of a standard
HP 8753.
This system is verified daily, using a bottoms-up
procedure that quantifies individual sources of measurement error.
Refer to Table 1 to see which measurements are the basis for system verification.
Table 1. Measurements Used for System Verification
1
Verification Device
Magnitude
Phase
Magnitude
Phase
20
attenuator
X
X
X
60
attenuator
X
X
mismatch attenuator
X
X
HP 85029B
7mm Verification Kit
1
