RIGOL DSA875 - Manual (Page 74)

RIGOL Chapter 2 Front Panel Operation
User’s Guide for DSA800 Series 2-22
MaxMixL
Set the max input level of the mixer according to the magnitude of the signal.
Key Points:
 For a larger input signal, select a smaller maximum mixing level to increase
the input attenuation and reduce the distortion of the signal; for a smaller
input signal, select a larger maximum mixing level to reduce the input
attenuation and noise.
 Parameters in inequality (2-3) are always modified on the basis of the
maximum mixing level.
 You can modify this parameter using the numeric keys, knob or direction keys.
For more details, please refer to “Parameter Setting”.
Table 2-12 Maximum Mixing Level
Parameter Explanation
Default -10 dBm
Range -30 dBm to 0 dBm
Unit dBm, -dBm, mV, uV
Knob Step 1 dBm
Direction Key Step 10 dBm
Input Impedance
Set the input impedance for voltage-to-power conversions (refer to equation (2-4)).
The default is 50 Ω. To measure a 75 Ω device, you should use a 75 Ω to 50 Ω
adapter (option) supplied by
RIGOL to connect the analyzer with the system
under test and then set the input impedance to 75 Ω.
Note: “75 Ω” will be shown in the status bar on the screen in this situation.