1502: Difference between revisions

package used to protect the sampler and TD.  It's pretty obscure.  The BNC connector on later 1502s contained an internal shorting bar that shorted the center conductor to the shell with no mating connector installed.  In use, it was to short out the connecting cable so that any static on the line would be discharged before opening up the BNC connector to the internals of the TDR.  Often, this shorting bar would break off rendering the connector unable to discharge a cable to be connected.  Replacing this BNC connector (or any front-panel component, for that matter) is a laborious process involving resealing the front panel for waterproofing.  The original 1502 and 1503 were the first Tektronix instruments to be fully waterproof (with the X-Y Module installed) such that it could actually be operated while submerged to a shallow depth.  The front panel sealing is a very involved process utilizing several different silicone (grease and RTV) products to do the job.  Tektronix produced a separate Instuction Manual specifically for waterproofing details of the 1500-series.