Specifications
Measuring the Carrier-to-Noise Ratio R&S FSH
1145.5973.12 2.26 E-10
Measuring the noise power
Enter an unoccupied transmission channel and its channel bandwidth to determine the noise power.
Selecting the result display:
¾ Press the SELECT MEASURE softkey.
¾ Using the rotary knob or the cursor keys, select the desired result display (C/N or C/N
0
) and
confirm your choice with the ENTER key or the F1 softkey.
The R&S FSH outputs the power ratio according to the selected result display.
Selecting the unoccupied transmission channel:
¾ Press the NOISE MEASURE softkey.
¾ Using the rotary knob or the cursor keys, select the desired entry (Channel, Vision Carrier Freq,
Center Freq or 8VSB Pilot Freq) and confirm your choice with the ENTER key or the F5 softkey.
You can alternatively also enter the channel center frequency after pressing the FREQ function key.
The R&S FSH measures the noise power in the selected transmission channel.
Entering the channel bandwidth of the noise channel:
¾ If the noise power measurement is active, press the CHANNEL BW softkey.
¾ Enter the desired value and terminate the entry with the appropriate unit key.
The R&S FSH sets the span in accordance with the selected bandwidth.
The channel center frequency is calculated when the vision carrier frequency is entered.
Automatic levelling:
¾ If the noise power measurement is active, press the LEVEL softkey.
¾ Using the rotary knob or the cursor keys, select LEVEL ADJUST and confirm your choice with
the ENTER key or the F2 softkey.
Depending on the input signal, the R&S FSH is optimally levelled.
Blanking out the result display:
The C/N ratio or the reference is indicated at the bottom of the display. This insertion can be
deactivated.
¾ Press the NOISE MEASURE or REF MEASURE softkey.
¾ Using the rotary knob or the cursor keys, select DISPLAY OFF and confirm your choice with the
ENTER key or the F4 or F5 softkey.
The R&S FSH blanks out the result display.
Inserting the result display:
¾ Press the NOISE MEASURE or REF MEASURE softkey.
¾ Using the rotary knob or the cursor keys, select DISPLAY ON and confirm your choice with the
ENTER key or the F4 or F5 softkey.
The R&S FSH inserts the result display at the bottom of the display.