Power Meter
R&S
®
ZNH
174
User Manual 1334.5985.02 ─ 02
Center frequency
Note that the R&S
ZNH maintains the center frequency that you have set in another
operating mode. In that case, it uses that frequency as the power sensor frequency.
If you want to perform measurements on another known signal, you can change the
power sensor frequency manually.
1. Select "Freq" softkey.
The R&S
ZNH opens an input field to define the frequency.
2. Enter the frequency of the signal.
The R&S
ZNH transfers the new frequency to the power sensor which then cor-
rects the measured power readings.
Wavelength
Wavelength is typically used in the measurement result for optical power sensor mea-
surement. The R&S
ZNH supports the wavelength: 850 nm, 1300 nm, 1310 nm, 1490
nm, 1550 nm, 1610 nm, 1625 nm for measurement.
1. Select "wavelength" softkey.
The R&S
ZNH opens a submenu for the selection of wavelength settings.
2. Select the required wavelength for measurement.
The R&S
ZNH transfers the new wavelength to the power sensor which then cor-
rects the measured power readings.
Zeroing the power sensor
Offset voltages and currents have most effect on the power readout when measuring
low powers. You can compensate for these offsets by zeroing the power sensor.
Do not apply power during the zeroing process, as the power sensor cannot distinguish
between external powers and internal offsets.
1. Select "Zero" softkey.
2. The R&S
ZNH asks you not to apply any signals to the power sensor during the
zeroing process.
3. Disconnect the power sensor from any signal sources.
4. Select "Continue" softkey to start zeroing.
5. Select "Cancel" softkey to abort zeroing, for example, if you cannot disconnect the
signal source.
Using a Power Sensor
