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[[File:Tekprobe_2_interface.png|250px|thumb|right|Tekprobe-BNC interface]] | [[File:Tekprobe_2_interface.png|250px|thumb|right|Tekprobe-BNC interface]] | ||
The '''Tekprobe BNC''' interface was introduced in 1986 and is widely used in 1990s Tektronix equipment to interface active probes (e.g. the [[P6243]]) to oscilloscopes. | The '''Tekprobe BNC''' interface was introduced in 1986 and is widely used in 1990s Tektronix equipment to interface active probes (e.g. the [[P6243]]) to oscilloscopes. | ||
It is a downward-compatible successor to the [[BNC connector with readout ring]] used in earlier instruments like the [[7000 series scopes]]. | |||
It consists of a plain [[BNC connector]] that allows traditional BNC based connections such as from passive probes. (See [[Patent US 4708661A]].) | It consists of a plain [[BNC connector]] that allows traditional BNC based connections such as from passive probes. (See [[Patent US 4708661A]].) | ||
This connector is surrounded by contact pads carrying power and data. | This connector is surrounded by contact pads carrying power and data. | ||
The two larger pad areas match the simple resistive readout pins | The two larger pad areas match the simple [[BNC connector with readout ring|resistive readout pins]], with division factors encoded as resistance to ground, although TekProbe BNC-era instruments accept values that earlier instruments did not. | ||
to ground | The smaller pads carry +15 V, +5 V, −5 V and −15 V power, an offset voltage (-1 V to +1 V) supplied and controlled by the mainframe, and a clock/data signal pair for serial communication between the mainframe and "smart" probes. | ||
Probes are allowed to draw max. 1.25 W, max. 75 mA from the ±5 V rails, and max. 25 mA from the ±15 V rails. | |||
The smaller pads carry +15 V, +5 V, −5 V and −15 V power, an offset voltage (-1 V to +1 V) | |||
supplied and controlled by the mainframe, and a clock/data signal pair for serial communication | |||
between the mainframe and "smart" probes. | |||
from the ±5 V rails, and max. 25 mA from the ±15 V rails. | |||
A [[Tekprobe SMA connector|similar standard]] exists based on [[SMA connector]]s, suitable for higher frequencies. | A [[Tekprobe SMA connector|similar standard]] exists based on [[SMA connector]]s, suitable for higher frequencies. |