155-0076-00: Difference between revisions
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[[File:Tek m94 probe ring decoder.png|600px|M94 Probe Ring Decoder]] | [[File:Tek m94 probe ring decoder.png|600px|M94 Probe Ring Decoder]] | ||
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When a 10x probe is connected, the voltage of the probe pin ring is determined by a voltage divider | When a 10x probe is connected, the voltage of the probe pin ring is determined by a voltage divider | ||
formed by the 5 kΩ resistor (to +5 V) in the scope and the 11 kΩ resistor (to ground) in the probe. | formed by the 5 kΩ resistor (to +5 V) in the scope and the 11 kΩ resistor (to ground) in the probe. | ||
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[[File:Tek m94 probe ring decoder 11k.png|600px]] | [[File:Tek m94 probe ring decoder 11k.png|600px]] | ||
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When a 100x probe is connected, the voltage at pin 11 is 2.77 V. | When a 100x probe is connected, the voltage at pin 11 is 2.77 V. | ||
Q57 is on and Q56 is off. | Q57 is on and Q56 is off. | ||
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[[File:Tek m94 probe ring decoder 6.2k.png|600px]] | [[File:Tek m94 probe ring decoder 6.2k.png|600px]] | ||
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Some probes have an "identify" button. | Some probes have an "identify" button. | ||
When pressed, that button shorts the probe detect pin to ground. | When pressed, that button shorts the probe detect pin to ground. | ||
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[[File:Tek m94 probe ring decoder identify.png|600px]] | [[File:Tek m94 probe ring decoder identify.png|600px]] | ||
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==Used in== | ==Used in== | ||