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576: Difference between revisions
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Overall, the instrument has held its value and popularity very well. | Overall, the instrument has held its value and popularity very well. | ||
Vacuum tubes can have their curves traced on a 576. | |||
This requires a fixture that provides the heater current to the tube under test. | |||
Pairs of tubes can be matched this way. | |||
Alternatively, the two triodes in a dual-triode can be compared. | |||
The | The Tektronix [[570]] (last sold around 1966) specializes in tube measurements | ||
and has a built-in heater supply for the tube under test, which makes the 570 convenient. | |||
However, with a custom fixture, the 576 can make most, if not all, | |||
of the same measurements that can be made on a 570. | |||
The AC collector sweep mode is useful when one wants a single plot showing the behavior of a device with positive and negative | |||
voltages. For example, a zener diode typically starts conducting at a few hundred millivolts in the positive direction, | |||
but has minimal reverse conduction until the zener voltage is reached, e.g., at 6.2 volts. | |||
On a different subject, it might be noted here that the introduction of the 576 marked the approximate time | On a different subject, it might be noted here that the introduction of the 576 marked the approximate time | ||