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Troubleshooting sampling scopes: Difference between revisions
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often completely unusable, which makes repairing it more difficult. | often completely unusable, which makes repairing it more difficult. | ||
Following these steps can make the repair process more manageable. | Following these steps can make the repair process more manageable. | ||
These | These steps apply to Tektronix modular sampling scopes such as the | ||
661, 567, and the other 560-series scopes fitted with sampling | 661, 567, and the other 560-series scopes fitted with sampling | ||
vertical and horizontal plug-ins. | vertical and horizontal plug-ins. If you need to do work on plug-ins, | ||
extenders are highly desirable. | |||
First, make sure the power supply is working properly. Power up | First, make sure the power supply is working properly. Power up | ||
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signal is applied and does not produce strobe pulses when the trigger signal | signal is applied and does not produce strobe pulses when the trigger signal | ||
is removed. | is removed. | ||
The third step is to get the vertical sampling unit working. Now simultaneously | |||
apply the 100mV 1MHz squarewave to the signal input of the sampling unit and to | |||
the external trigger input of the timing unit. You can use a BNC T-adapter. It | |||
will corrupt the signal integrity, but at this stage that doesn't matter. Confirm | |||
that the strobe pulses are getting to the sampling plug-in. | |||
The fourth step (if the scope is a 567 or 568/230) is the get the digital unit working. | |||