RIGOL DSA875 - Manual (Page 121)

Chapter 2 Front Panel Operation RIGOL
User’s Guide for DSA800 Series 2-69
Table 2-44 Average Number for C/N Ratio Measurement
Parameter Description
Default 10
Range 1 to 1000
Unit N/A
Knob Step 1
Direction Key Step 1
2. Avg Mode
Set the average operation mode to “Exp” or “Repeat” and the default is “Exp”.
 When “Exp” is selected, the result is the exponential average of the
current N (N is specified in “Avg Num”) measurement results.
 When “Repeat” is selected, the result is the arithmetic average of the
current N (N is specified in “Avg Num”) measurement results.
3. Offset Freq
Set the difference between the carrier center frequency and the noise center
frequency. You can use the numeric keys, knob and direction keys to modify
this parameter.
Table 2-45 Frequency Offset for C/N Ratio Measurement
Parameter Description
Default 2 MHz
Range 33 Hz to 2.5 GHz
Unit GHz, MHz, kHz, Hz
Knob Step Offset Frequency/100, the
minimum is 1Hz
Direction Key Step in 1-1.5-2-3-5-7.5 sequence
4. Noise BW
Set the bandwidth of the noise to be measured. You can use the numeric keys,
knob or direction keys to modify this parameter.