Measuring forward and reflected power
R&S FSH
1145.5973.12 4.78
E-14
Screen layout for measurements with Directional Power Sensors R&S FSH-Z14/-Z44:
Display of the power
sensor type
Readout of matching
value (VSWR or return
loss)
Analog indication of
matching (VSWR or
return loss)
Selected transmission
standard
Reference display
for relative power
measurement
Measurement
frequency
Analog indication
of forward power
Power offset
Readout of forward
power (dBm, W or
dB, relative)
The power sensors contain frequency-dependent correction values. This means that the highest
accuracy is reached for signals whose frequency is known. When the R&S FSH switches to the power
measurement mode from another operating mode, it transfers its current center frequency to the power
sensor.
If a signal at another frequency is to be measured, the new center frequency can be transferred to the
power sensor by entering the frequency (FREQ softkey).
Press the FREQ softkey.
The frequency value entry box opens.
Using the number keys, enter the frequency you
want and confirm the entry with the ENTER key or
by pressing the FREQ softkey again.
The R&S FSH transfers the new frequency to the
power sensor which corrects the measured power
values accordingly.
Zeroing the power sensor
Offset voltages and currents have the greatest effect on the power readout when low powers are being
measured. Zeroing is used to compensate for these offsets. The power sensor automatically performs
zeroing when the corresponding function is activated by the user. No power must be applied to the
sensor while zeroing is being performed, since the sensor cannot distinguish between external powers
and internal offsets.
深圳市盛腾仪器仪表有限公司
Tel:0755-83589391
Fax:0755-83539691
Website: www.Sengt.com