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155-0076-00: Difference between revisions
→Probe Readout Ring Decoder
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The M94 has a circuit for decoding the probe attenuation factor based on the probe readout pin. | The M94 has a circuit for decoding the probe attenuation factor based on the probe readout pin. | ||
The probe readout pin contacts the readout ring on the probe input of the scope. | The probe readout pin contacts the readout ring on the probe input of the scope. | ||
The readout ring is pulled up to 5 volts by a 5 kΩ resistor. | The readout ring is pulled up to 5 volts by a 5 kΩ resistor outside of the M94. | ||
Inside the probe, there is a resistor between the readout pin and the ground of the BNC connector. | |||
This scheme allows the scope to distinguish 1x, 10x, and 100x probes, and adjust on-screen readout scale accordingly, | |||
so that the on-screen scale is referenced to the voltage at the probe tip. | |||
==Used in== | ==Used in== | ||