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Troubleshooting sampling scopes: Difference between revisions
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The second step is to get the timing (horizontal) unit working. The best | The second step is to get the timing (horizontal) unit working. The best | ||
technique here is to apply a pulse train ( | technique here is to apply a pulse train (100 mV, 1 MHz, for example) waveform | ||
to the external trigger input of the timing unit while | to the external trigger input of the timing unit while | ||
observing its outputs on a second oscilloscope. | observing its outputs on a second oscilloscope. | ||
Some timing plug-ins such as the 3T77 provide a trigger pulse output on the | |||
front panel. Other plug-ins such as the 5T1A and 5T3 do not provide this | Some timing plug-ins such as the [[3T77]] provide a trigger pulse output on the | ||
front panel. Other plug-ins such as the [[5T1A]] and [[5T3]] do not provide this | |||
signal on the front panel, so for those you have to probe the signal inside | signal on the front panel, so for those you have to probe the signal inside | ||
the plug-in. The timing plug-in is supposed to produce strobe pulses that | the plug-in. The timing plug-in is supposed to produce strobe pulses that | ||
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The third step is to get the vertical sampling unit working. Now simultaneously | The third step is to get the vertical sampling unit working. Now simultaneously | ||
apply the | apply the 100 mV, 1 MHz 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 | 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 | 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. | that the strobe pulses are getting to the sampling plug-in. | ||
The fourth step (if the scope is a 567 or 568/230) is to get the digital unit working. | The fourth step (if the scope is a [[567]] or [[568]]/230) is to get the digital unit working. | ||
[[Category:Repair issues]] | |||