As with all electronic equipment, component failures are increasing as the T Series oscilloscopes age. In plastic case units only, VR, a 33 volt zener diode, can fail and cause loss of the CRT display. VR, a 4. If your TR works when connected to a panel equipped with its own scope output coupling capacitor SIE bond panels, for instance , but misbehaves when connected directly to the line, suspect a shorted C These two problems with the vertical input are often caused by exceeding the rated input voltage, but also look for a shorted CR or CR as a cause of the dual JFET failure.
Problems have been reported with the various interconnect cables. Check all internal wiring for bad connections at the various connectors.
Shorts or opens are sometimes seen in the high voltage tripler assembly U These are potted assemblies not intended to be repaired at the component level. At present there is no known source of replacement tripler assemblies, except from scrapped instruments.
Stan Griffiths , scope guru, has indicated he is looking for a solution to this problem; visit Stan's Scope Site , and the Tektronix Resource Site which he co-created. The CRT in the later production TR scopes it was never used in the plastic case version T or T has a "halo reducing mesh" which was probably incorporated due to complaints about sharpness, and likely because of the VDL application.
The CRT does not have the "halo reducing mesh" feature. Tektronix actively sought comments from the well logging industry while the TR was being developed. Prototypes were actually left with selected logging companies for evaluation. Our good friend Paul Knight, then with The Western Company, was among those who made suggestions that helped shape the design. The TR has a very rugged face to support the heavy 70 mm cameras used for cement bond logging in those days.
It has rear switch selectable inputs not usually found on even rack mount oscilloscopes. It has a bright display useful in sunlit logging trucks , using a nominal accelerating potential of It has scale illumination useful for night time logging. It has user selectable chop or alternate mode for dual trace display, and a single sweep feature. And it has internally selectable Z-axis polarity. Except for the bright display, all of the foregoing features are present only on the TR version, and not present on the plastic case T The Time Base provides stable triggering over the full bandwidth of the Vertical Amplifier and provides calibrated sweep rates from 0.
Service and User Manual. Vertical Amplifier Time Base Display and Power supply. Comments No comments yet. Be the first!
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