Setting and Using the Measurement Functions R&S FSH3
¾ Press the MEAS key.
¾ Press the MEASURE softkey.
The measurement function submenu opens.
¾ Using the cursor keys or the rotary knob, select the
TRACKING GEN menu item (highlighted in red)
and confirm your selection with the ENTER key or
the MEAS softkey.
The R&S FSH3 turns on the tracking generator and
switches to its softkey menu. However, the frequency
and level settings from the spectrum analyzer mode
are not changed.
The softkey menu for the tracking generator contains softkeys for calibrating transfer function
measurements (TRANSM CAL) and reflection coefficient measurements (REFLECT CAL). Calibration
is necessary because the tracking generator output level is not precisely –20 dBm (or 0 dBm, as the
case may be) and is also frequency-dependent. If transmission measurements are performed on a two-
port, the calibration takes the transmission characteristics of the test setup and the frequency response
of the tracking generator into account and corrects the measurement with the correction data that has
been obtained. When a reflection measurement is to be performed, during calibration the R&S FSH3
measures the reflection coefficient at a short and at an open on the bridge. These two measurements
provide the correction data for reflection measurements.
Tracking generator
mode display
Softkeys for scalar
mode
Softkeys for vector
mode
(Option FSH-K2)
0 dB reference
Softkey menu for
tracking generator
Model 1145.5850.23
only
When the tracking generator is switched on, the R&S FSH3 displays Track Gen Uncal . This indicates
that tracking generator measurements are uncalibrated. The level axis is in the relative unit dB. Apart
from the level values, the 0 dB reference is also displayed. This corresponds to a reference level of
-20 dBm in the spectrum analyzer mode (= nominal output level of the tracking generator). If an output
level of 0 dBm is used with model 1145.5850.23, the 0 dB reference corresponds to a reference level of
0 dBm.
When the tracking generator is on, measurement parameters like bandwidth or the frequency range are
selected with the appropriate keys as in the spectrum analyzer mode. When the MEAS key is pressed,
the softkey menu for the tracking generator is displayed.
1145.5973.12 4.54 E-6
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