Measuring apparatus having: a transmit-receive device; an offset determination apparatus for determining an amplitude offset comprising: a sampling receiver device for receiving time-expanded sampling values (421b, 421 c, 421d, 421e) of a reflection signal of a transmit signal that is periodically sent with a first cycle duration by a transmitter device; a control device for controlling the transmitter device; an offset provision device; wherein the control device is adapted, outside a predefinable measuring time range (407, I) of the time-expanded sampling values (421b, 421c, 421d, 421e) of a reflection signal, to provide a switch-off signal (TX_On) which can deactivate the transmitter device at least intermittently in order to generate a predefinable quiescent time range (408, II) within the time-expanded sampling values (421b, 421 c, 421d, 421e) of the reflection signal; wherein the offset provision device is adapted, by evaluating at least one sampling value (421 b, 421 c, 421d, 421e) of the time-expanded sampling values, which value is determined within the quiescent time range (408, II), to determine a value of an amplitude offset of the time-expanded sampling values (421b, 421c, 421d, 421e) of the reflection signal from a normal value and to supply this value of the amplitude offset at an output (210a, 210b) of the offset provision device; wherein the control device of the offset determination apparatus is connected to the transmit-receive device. a transmit-receive device; an offset determination apparatus for determining an amplitude offset comprising: a sampling receiver device for receiving time-expanded sampling values (421b, 421 c, 421d, 421e) of a reflection signal of a transmit signal that is periodically sent with a first cycle duration by a transmitter device; a control device for controlling the transmitter device; an offset provision device; wherein the control device is adapted, outside a predefinable measuring time range (407, I) of the time-expanded sampling values (421b, 421c, 421d, 421e) of a reflection signal, to provide a switch-off signal (TX_On) which can deactivate the transmitter device at least intermittently in order to generate a predefinable quiescent time range (408, II) within the time-expanded sampling values (421b, 421 c, 421d, 421e) of the reflection signal; wherein the offset provision device is adapted, by evaluating at least one sampling value (421 b, 421 c, 421d, 421e) of the time-expanded sampling values, which value is determined within the quiescent time range (408, II), to determine a value of an amplitude offset of the time-expanded sampling values (421b, 421c, 421d, 421e) of the reflection signal from a normal value and to supply this value of the amplitude offset at an output (210a, 210b) of the offset provision device; wherein the control device of the offset determination apparatus is connected to the transmit-receive device. a sampling receiver device for receiving time-expanded sampling values (421b, 421 c, 421d, 421e) of a reflection signal of a transmit signal that is periodically sent with a first cycle duration by a transmitter device; a control device for controlling the transmitter device; an offset provision device; wherein the control device is adapted, outside a predefinable measuring time range (407, I) of the time-expanded sampling values (421b, 421c, 421d, 421e) of a reflection signal, to provide a switch-off signal (TX_On) which can deactivate the transmitter device at least intermittently in order to generate a predefinable quiescent time range (408, II) within the time-expanded sampling values (421b, 421 c, 421d, 421e) of the reflection signal; wherein the offset provision device is adapted, by evaluating at least one sampling value (421 b, 421 c, 421d, 421e) of the time-expanded sampling values, which value is determined within the quiescent time range (408, II), to determine a value of an amplitude offset of the time-expanded sampling values (421b, 421c, 421d, 421e) of the reflection signal from a normal value and to supply this value of the amplitude offset at an output (210a, 210b) of the offset provision device; wherein the control device of the offset determination apparatus is connected to the transmit-receive device.