011-0068-00
The Tektronix 011-0068-00 is an input RC standardizer with BNC connectors for calibrating instruments with 1 MΩ // 47 pF BNC inputs. It must be connected directly to the instrument input connector.
It was superseded by the 067-0541-00 input RC normalizer, which is identical except for the name and part number.
The 011-0030-00 (superseded by the 067-0535-00) is the equivalent with UHF connectors.
Pictures
Example With Short Part Number
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011-068