Measurements on CW Signals
R&S FSH
1145.5973.12 2.10
E-11
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In the main menu for the tracking generator, press
the MEAS key.
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Press the TRANSM CAL softkey.
The R&S FSH now prompts you to connect the RF
input to the tracking generator’s output so that
calibration can be carried out.
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Connect the RF output to the generator’s input
without the DUT.
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Press the CONTINUE softkey to start calibration.
During calibration, the R&S FSH outputs the message
"Calibrating THROUGH, please wait...".
When calibration has been completed, the R&S FSH
outputs the message "Transm. calibrated" for
3 seconds.
The R&S FSH now displays Transmission in the
upper right-hand corner of the measurement diagram.
This tells you that the R&S FSH has been calibrated
for transfer function measurements. In addition, the
TRANS CAL softkey label is highlighted in green.
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Connect the DUT between the RF input and the
generator's output.
The R&S FSH displays the magnitude of the transfer
function. You can read out values with the markers, for
example.
The transmission calibration remains valid until the center frequency or the span is changed on the
R&S FSH. Track Gen Uncal is displayed in the upper right-hand corner of the screen if the calibration
is no longer valid.
If the reference is changed after calibration, greater measurement uncertainty must be anticipated (up
to 1 dB). The R&S FSH retains the calibration data but displays a red dot in front of
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Transmission .
When saving a data set for a scalar transmission measurement in a calibrated state, the R&S FSH can
store the calibration data along with the other settings (see section "Saving Calibration Data"). Thus,
after the setting is recalled, a measurement can be performed without prior calibration, provided that the
instrument's temperature does not deviate more than 5 °C from its temperature when the data set was
stored.
If the temperature deviation is greater, the R&S FSH outputs a (red) dot in front of
•
Transmission . A
precise measurement can then be made only after a calibration.
