Measuring the channel power of continuously modulated signals
R&S FSH
1145.5973.12 4.38
E-14
Press the CHAN BW softkey.
The value entry box showing the current channel
bandwidth setting opens.
Using the number keys enter a new channel
bandwidth and terminate the entry with the
appropriate unit, or
Using the rotary knob or the cursor keys, change
the channel bandwidth and confirm with the
ENTER key or the CHANNEL BW softkey.
The R&S FSH automatically sets the appropriate span
for the channel bandwidth that has been entered (span
= 1.2 x channel bandwidth) to ensure that no incorrect
channel power measurements are made.
The minimum channel bandwidth that can be set is
8.33 kHz with R&S FSH3 models 1145.5850.03 and
1145.5850.13.
If you attempt to enter a smaller channel bandwidth,
the R&S FSH will automatically set 8.33 kHz and
output the message “Out of range
”
.
With the R&S FSH3 model 1145.5850.23 and with the
R&S
FSH6 / R&S
FSH18, the minimum channel
bandwidth is 833 Hz at a span of 1 kHz.
Changing the span
The span set by the R&S FSH yields extremely precise measurement results. However, signals in the
environment of the measurement channel are no longer detectable. To enable users to see the
spectrum outside the measurement channel, the span can be changed up to a factor of ten times the
channel bandwidth during the channel power measurement.
Operation:
Press the SPAN key.
The AUTO SPAN softkey label is highlighted in green
to indicate that the optimum span for the channel
power measurement is set. MANUAL SPAN is
activated to allow immediate entry of another span.
Using the numeric keys, enter a new span and
terminate the entry with the appropriate unit, or
Change the span with the rotary knob or the cursor
keys and terminate the entry with the ENTER key
or the MANUAL SPAN softkey.
深圳市盛腾仪器仪表有限公司
Tel:0755-83589391
Fax:0755-83539691
Website: www.Sengt.com
