132
edits
1502: Difference between revisions
Jump to navigation
Jump to search
m
→Repair issues: fixed first person text and broken link
No edit summary |
m (→Repair issues: fixed first person text and broken link) |
||
| Line 28: | Line 28: | ||
21 mA, 1.5 pF) is simply no longer available. The closest Russian replacement is GI308E, it requires soldering to the original heatsink. | 21 mA, 1.5 pF) is simply no longer available. The closest Russian replacement is GI308E, it requires soldering to the original heatsink. | ||
Replacement of the pulse generator might be done with Analog Devices ADCMP580. An interesting circuit can be found in Starecki and Misiaszek's paper, | |||
''[http:// | ''[http://smicp.ise.pw.edu.pl/~tomi/papers/wilga2006_50ps.pdf Low cost programmable pulse generator with very short rise/fall time]''. | ||
There appears to have been an optional "static suppressor" in a BNC M-F package, Tek [[011-0132-00]], 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 instruction manual specifically for waterproofing details of the 1500-series. | There appears to have been an optional "static suppressor" in a BNC M-F package, Tek [[011-0132-00]], 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 instruction manual specifically for waterproofing details of the 1500-series. | ||