Rohde & Schwarz R&S FSL3 - Video Scope Measurement

Cable TV Measurements (Option K20) R&S FSL
1300.2519.12 2.52 E-11
In the measurement example, all results were within the chosen limits, except the absolute power of
t
he vision carrier. This is indicated by red color and a star.
Fig. 2-34 Analog TV Carriers measurement
Note: The "frequency offsets'' are measured in this way:
For sound carriers:
The TV standard demands that the sound carrier frequency shall be f
1
Hz greater than the
vision carrier frequency. The actual frequency distance might be measured to be f
2
.
The value "Intercarrier frequency offset'' is therefore: f
2
– f
1
.
For the vision carrier:
The value ''frequency offset'' is the measured vision carrier frequency minus the RF frequency.
Video Scope measurement
This measurement determines the luminance signal in dependence of the time. The video scope is
triggered by the chosen trigger event, i.e. the line to be analyzed. From the result trace, the effects of
hum are eliminated ("back porch clamping").
Test setup:
Refer to the section Analog TV test setup.
Procedure:
1. Press the MEAS key.
2. Press the Analog TV softkey.
3. Press the More softkey.
4. Press the Video Scope softkey.
5. For the TV standard M in combination with another color system than PAL, press the Field 1/2
softkey to select field 1 or 2.