| CPC G01R 35/005 (2013.01) [G01R 27/32 (2013.01)] | 18 Claims |
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1. A calibration unit for calibrating a measurement device, such as a network analyzer, comprising:
a first port which is arranged for being connected to the measurement device;
a calibration module comprising at least three different calibration standards for calibrating the measurement device; and
a switching module configured to connect the first port with one of the at least three different calibration standards of the calibration module;
wherein the calibration unit further comprises at least one of:
a daisy chain port which is arranged for being connected to a further calibration unit, to an external power meter, or to a device-under-test, (DUT) wherein the first port is connectable to the daisy chain port;
an internal power meter which is arranged within a housing of the calibration unit, wherein the first port is connectable to the internal power meter; or
an internal impedance tuner which is arranged within a housing of the calibration unit, wherein the first port is connectable to the internal impedance tuner,
wherein the internal impedance tuner comprises an electrical line structure and a plurality of switches, especially in the form of transistors, which are arranged at different positions along the electrical line structure,
wherein each switch is configured to connect the respective position of the electrical line structure to ground in order to tune the internal impedance tuner to a specific impedance, and
wherein a matched load is arranged at one end of the line structure.
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