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20 Chapter 2
Operation
Getting Started
Operation
If you are using an 11970Q, 11970U, 11970V or 11970W Mixer, and the shoulder of its waveguide
flange is not properly aligned with the flange of the device under test, amplitude measurement errors can
result. To ensure proper alignment, tighten each of the four flange screws in turn by small amounts,
moving clockwise around the flange.
NOTE 11970K and 11970A Mixers require flange screws that are different from
those used with the 11970Q, 11970U, 11970V and 11970W; 11970K and
11970A use Part Number 3030-0221 (#4-40 hex head screw). 11970Q,
11970U, 11970V and 11970W use Part Number 1390-0671 (#4-40 hex head
captive screw).