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155-0076-00: Difference between revisions
→Probe Readout Ring Decoder
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[[File:Tek m94 probe ring decoder 6.2k.png|600px]] | [[File:Tek m94 probe ring decoder 6.2k.png|600px]] | ||
Some probes have an "identify" button. | |||
When pressed, that button shorts the probe detect pin to ground. | |||
In that situation, pin 11 of the M94 is at ground potential | |||
and the identify switch is sinking 200 μA from the 5 kΩ pullup resistor. | |||
Q52 is on. | |||
Q51 is off, and there is no tail current in Q56/Q57, and the same with Q62/Q63. | |||
The ID pin is sinking current. | |||
[[File:Tek m94 probe ring decoder identify.png|600px]] | |||
==Used in== | ==Used in== | ||