Keysight Technologies 85033E, User And Service Manual

Page: 25 / 52

Keysight 85033E User’s and Service Guide 3-
7
Use, Maintenance, and Care of the Devices
Gaging Connectors
Gaging Connectors
The gages available from Keysight Technologies (see Table 6-3 on page 6-4 for
part number information) are intended for preventive maintenance and
troubleshooting purposes only. They are effective in detecting excessive center
conductor protrusion or recession, and conductor damage on DUTs, test
accessories, and the calibration kit devices.

Do not use the gages for precise
pin depth measurements.
Connector Gage Accuracy
The connector gages are only capable of performing coarse measurements.
They do not provide the degree of accuracy necessary to precisely measure the
pin depth of the kit devices. This is partially due to the repeatability
uncertainties that are associated with the measurement. Only the
factory—through special gaging processes and electrical testing— can
accurately verify the mechanical characteristics of the devices.
With proper technique, however, the gages are useful in detecting gross pin
depth errors on device connectors. To achieve maximum accuracy, random
errors must be reduced by taking the average of at least three measurements
having different gage orientations on the connector. Even the resultant
average can be in error by as much as

0.0001 inch due to systematic
(biasing) errors usually resulting from worn gages and gage masters. The
information in Table 2-3 on page 2-3 assumes new gages and gage masters.
Therefore, these systematic errors were not included in the uncertainty
analysis. As the gages endure more use, the systematic errors can become
more significant in the accuracy of the measurement.
The measurement uncertainties are primarily a function of the assembly
materials and design, and the unique interaction each device type has with the
gage. Therefore, these uncertainties can vary among the different devices. For
example, note the difference between the uncertainties of the opens and
shorts in Table 2-3 on page 2-3 .
The observed pin depth limits add these uncertainties to the typical factory pin
depth values to provide practical limits that can be referenced when using the
gages. See “Pin Depth” on page 2-2 . Refer to “Kit Contents” on page 1-1 for
more information on the design of the calibration devices in this kit.
When measuring pin depth, the measured value (resultant average of three or more
measurements) contains measurement uncertainty and is not necessarily the true value. Always
compare the measured value with the observed pin depth limits (which account for measurement
uncertainties) in
Table 2-3 on page 2-3
to evaluate the condition of device connectors.