Anritsu VectorStar ME7838 Series, Руководство по обслуживанию

Страница: 41 / 178

Performance Verification 3-5 ME7838A/E System Verification—Waveguide Millimeter-Wave System
VectorStar ME7838 Series MM PN: 10410-00306 Rev. F 3-5
3-5 ME7838A/E System Verification—Waveguide Millimeter-Wave System
Configuration
The performance of ME7838A/E Waveguide Millimeter-Wave system configuration is verified by looking at the
calibrated system residual performance at the waveguide interfaces.
Equipment Required
• Anritsu 3655 Series Waveguide Calibration Kit
• Extended E Band (WR-12): 3655E-1
• Extended W Band (WR-10): 3655W-1
• Flann Microwave Precision Waveguide Straight Section
• Extended E Band (WR-12): 26443-4122
• Extended W Band (WR-10): 27443-4123
Best Practices for Waveguide Connections
• The flange flat surface around the device waveguide aperture should be free of debris, nicks and
scratches. Use appropriate size protective cap to cover the waveguide flange(s) when not in use.
• Through line and shim waveguide channels should be free of debris. Clean pressurized air is permissible
to clean the channel. DO NOT use cold spray as the resultant condensation may affect the channel
surface.
• DO NOT attempt to clean out the channel of any other waveguide device besides a through line or shim.
• Use only captivated (partially threaded) screws for waveguide connections. The threads should contact
ONE flange only when fully tightened. The unthreaded length is critical when inserting shims.
• Carefully observe the threads of waveguide screws before use, especially the starting threads, for nicks
and burrs.
• There are two standard hex head sizes for waveguide captivated screws; one is more common than the
other

3/32” or 0.093”.
• Essential tools are a hex head driver for the waveguide screws with a ball joint end and a short right
angle hex head wrench. There is no standard torque specification for waveguide screws in this
application.
• When mating two waveguide devices, use care that the fixed index pins do not scratch the flat surface of
the opposite flange.
• If the Test Ports are precision type flanges, ALWAYS use the removable precision index pins from the
calibration kit at every step of the calibration. Note if one end of the pin is beveled, that end projects out
of the flange, to facilitate mating. Also note that the precision flange index pin length and the depth of
the bore in the flange are not standardized, so mixing parts from different manufacturers may result in a
(short) pin being “lost” in a (deep) bore!
• Always use four screws when connecting waveguide devices. It is permissible to use two back side and
two front side but both screws on each side must be 180 degrees apart.
• Use extreme care when starting the threading of waveguide screws, especially with aluminum material.
Ensure the screw is perpendicular to the flange—this is made difficult when the ball head driver is used
and mechanical interferences dictates that it is set at an angle. If the screw starts to bind, STOP and
back it out. Discard this particular screw and start with another.
• When mating waveguide devices, the four screws should first be threaded down just until they stop and
then backed slightly. Observe closely the two mating surfaces of the waveguide flanges. This is
particularly important if the flange are not of the precision type. Make sure that the flange mating
surfaces are parallel to each other now and while the screws are subsequently tightened. Move one or
both flanges to set the parallel surfaces. If the flanges are not mated properly (cocked), a small gap will
be observed at the outside rim of the mating surface circumference.
• The four waveguide screws should be torqued as follows: