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TU-75B: Difference between revisions
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Revised 3ed paragraph to indicate 3 ballast lights rather than 2 are used, and added the lamp specs per the schematic.
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m (Revised 3ed paragraph to indicate 3 ballast lights rather than 2 are used, and added the lamp specs per the schematic.) |
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It's a Variac set up for 0-150 V and the E Out/Line switch is for the AC voltmeter. | It's a Variac set up for 0-150 V and the E Out/Line switch is for the AC voltmeter. | ||
The 1-2-3 switches provided the choice of | The 1-2-3 switches provided the choice of up to three internal incandescent lamps (parallel connection) for series resistance when the scope was turned on for the first time to prevent damage from shorts that weren't discovered during a visual inspection. Lamp configuration as specified by Tek is one #1 Photoflood lamp (250 watt) and two #2 Photoflood lamps (500 watts each). When all was deemed to be OK then DIRECT was chosen to eliminate the series resistance. | ||
The scope was then given a rough check for proper operation and put in a special room to cycle until the next day where it would be calibrated, sent to QC and then shipped. The DIRECT position was used in the cal procedure to check the power supply regulation from low to high line. | The scope was then given a rough check for proper operation and put in a special room to cycle until the next day where it would be calibrated, sent to QC and then shipped. The DIRECT position was used in the cal procedure to check the power supply regulation from low to high line. | ||