R&S FSH3 Setting and Using the Measurement Functions
With the MARKER OFFSET function, a new reference plane can be defined for the distance-to-fault
measurement. If a marker offset is defined, all distance values output by the R&S FSH3 are referenced
to the position of the offset marker.
Automatic marker positioning (PEAK, NEXT PEAK, MINIMUM) is always performed on the active
marker. The active marker is indicated ahead of the selected function (example: D1: PEAK). The zoom
function, too, acts on the active marker.
Measuring spectrum and reflection:
Apart from distance-to-fault measurements for cables, the R&S FSH3 also provides an overview
measurement for the frequency spectrum and reflections using the same settings – for example the
center frequency and span. The spectrum display mode is useful for detecting spurious signals.
External signals, e.g. from other transmitters, affect distance-to-fault cable measurements as they are
picked up at the R&S FSH3’s RF input and are superimposed on the measurement signal. Reflection
measurements are useful, e.g. for checking the matching of an antenna connected to the cable.
¾ Press the MEAS MODE softkey.
The R&S FSH3 opens the submenu with the various
measurement mode options.
¾ Select the mode you want using the rotary knob or
the cursor keys.
¾ Confirm your selection by pressing the MEAS
MODE softkey again or by pressing the ENTER
key.
When SPECTRUM is selected, the R&S FSH3 turns
off the tracking generator and displays the spectrum
over the frequency range of the DTF measurement. To
indicate that the R&S FSH3 is in the spectrum mode,
DTF Spectrum is displayed in the top right-hand corner
of the screen. Otherwise, the R&S FSH3 uses exactly
the same settings as it did for DTF measurements.
The spectrum mode is used to check if there are any
spurious signals in the frequency range of the DTF
measurement. These are most likely to be present if
the cable under test is connected to an antenna.
1145.5973.12 4.75 E-6
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