Keysight Technologies 85056D User's And Service Manual

Keysight 85056D and 85563A/85564A User’s and Service Guide 3-7Use, Maintenance, and Care of the DevicesGaging ConnectorsGaging ConnectorsThe gages available from Keysight Technologies are intended for preventivemaintenance and troubleshooting purposes only. See Table 6-2 on page 6-2for part number information. They are effective in detecting excessive centerconductor protrusion or recession, and conductor damage on DUTs, testaccessories, and the calibration kit devices. Do not use the gages for precisepin depth measurements.Connector Gage AccuracyThe connector gages are only capable of performing coarse measurements.They do not provide the degree of accuracy necessary to precisely measure thepin depth of the kit devices. This is partially due to the repeatabilityuncertainties that are associated with the measurement. Only thefactory—through special gaging processes and electrical testing— canaccurately verify the mechanical characteristics of the devices.With proper technique, the gages are useful in detecting gross pin depth errorson device connectors. To achieve maximum accuracy, random errors must bereduced by taking the average of at least three measurements having differentgage orientations on the connector. Even the resultant average can be in errorby as much as ± 0.0001 inch due to systematic (biasing) errors usuallyresulting from worn gages and gage masters. The information in Table 2-2 onpage 2-3 assumes new gages and gage masters. Therefore, these systematicerrors were not included in the uncertainty analysis. As the gages undergomore use, the systematic errors can become more significant in the accuracy ofthe measurement.The measurement uncertainties in Table 2-2 on page 2-3 are primarily afunction of the assembly materials and design, and the unique interaction eachdevice type has with the gage. Therefore, these uncertainties can vary amongthe different devices. For example, note the difference between theuncertainties of the opens and shorts in Table 2-2 on page 2-3.The observed pin depth limits in Table 2-2 on page 2-3 add these uncertaintiesto the typical factory pin depth values to provide practical limits that can bereferenced when using the gages. See “Pin Depth” on page 2-2. Refer to “KitContents” on page 1-1 for more information on the design of the calibrationdevices in the kit.When measuring pin depth, the measured value (resultant average ofthree or more measurements) contains measurement uncertainty and isnot necessarily the true value. Always compare the measured value withthe observed pin depth limits (which account for measurementuncertainties) in Table 2-2 on page 2-3 to evaluate the condition of deviceconnectors.