GW Instek GSP-930 User Manual - Manual (Page 154)

GSP-930 User Manual
152
3. Press Reference[F2] to set the reference to the
upper or lower base frequencies.
4. Press Limit[F3] and set the limit for the upper
and lower 3 rd order intermodulation product
amplitude.
5. Press Pass/Fail Test[F4] to toggle pass/fail
testing on/off.
CNR/CSO/CTB Measurement
Carrier to Noise Ratio (CNR)
Description Carrier to noise ratio calculates the difference in
amplitude between the carrier signal and the
noise level present in the transmission. CNR
measurements are used for both analog and
digital CATV.
Parameters Noise Marking Sets the position of the delta
marker (Δ1) using two
options:
MIN:
The delta marker will search
for the minimum between
the carrier frequency and the
carrier frequency + 4MHz.
Δ
Marker:
User defined delta marker
position.