Spectrum Analyzer Mode
R&S
®
Cable Rider ZPH
251
User Manual 1321.0950.02 ─ 07
Transducer factor availability
Transducer factors are not available for measurements with the tracking generator or
the Power Sensors. The "Transducer" softkey is therefore inactive.
You can select two transducer factors, a primary transducer and a secondary trans-
ducer. If a transducer factor is active, the checkbox next to the "Primary" or "Secon-
dary" menu is enabled.
1. Select the "Select Primary" menu item.
The R&S Cable Rider ZPH opens the "File Manager" to select the transducer fac-
tor.
2. Select the transducer factor you need.
The R&S Cable Rider ZPH shows the name of the active transducer on the display
(e.g. "Sec Tran PreAmp", "Pri Tran HE200A-20-200" ).
See
Figure 8-14
.
An example would be the transducer factor of the R&S HE200-A antenna that is
defined between 200 MHz and 500 MHz. The R&S Cable Rider ZPH therefore displays
the noise in this frequency range as a function of frequency incremented by the trans-
ducer factor. Outside the transducer range, the R&S Cable Rider ZPH sets the trans-
ducer factor at zero, i.e. measurements in this range do not yield conclusive results.
You can select a second transducer factor with the "Select Secondary" menu item. The
secondary transducer factor in that case is added to the first. The unit of the second
transducer factor must always be the relative unit dB as otherwise an addition would
not be useful. When you select a secondary transducer factor, the dialog box shows
only those transducer factors that have dB as their unit.
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Unit for Measurements with Transducers
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Setting the Reference Level
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Frequency Range of Transducer
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Data Sets Containing Transducer Factors
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8.4.1
Unit for Measurements with Transducers
If the unit of the transducer is dB, the units dBm, dBmV or dB
µ
V remain unchanged.
The linear units Volt and Watt are not permissible. They are deactivated in the units
menu.
If the unit of the transducer is dB
µ
V/m or dB
µ
A/m, this unit is also used for the R&S
Cable Rider ZPH level display. This means that both the level axis of the diagram and
the level at the marker position are assigned the unit of the transducer. If dBμV/m is
selected as the transducer unit, a switch to absolute level indication in V/m is possible.
1. Press the [SCALE/AMPT] key.
2. Select the "Unit" softkey.
3. Select the "V" menu item.
Using Transducer Factors
