Rigol DSA875 Manuel d'utilisateur télécharger pdf (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.

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Rigol DSA875 Manuel d'utilisateur Page 74