The accessory power supply 1103 enables the external power supply of the BNC interface probes via TekProbe. This allows probes that require a TekProbe interface power supply to be used with an oscilloscope or analyzer that does not provide a TekProbe BNC power supply (see data sheet). 1103 provides two independent channels consisting of a TekProbe BNC input, a voltage offset control with variable offset (±10 V or ±5 V) and a BNC signal output. The offset control provides a voltage that is adjustable via the front panel. This offset control is possible for special TekProbe BNC probes, e.g. P6235, P6245, P6246, P6247, P6248, P6249 and P6330.