RIGOL DSA875 - Manual (Page 66)

RIGOL Chapter 2 Front Panel Operation
User’s Guide for DSA800 Series 2-14
Table 2-7 Reference Level
Parameter Explanation
Default 0 dBm
Range -100 dBm to 20 dBm
Unit dBm, -dBm, mV, uV
Knob Step In Log scale mode, step = Scale/10
In Lin scale mode, step = 0.1 dBm
Direction Key Step In Log scale mode, step = Scale
In Lin scale mode, step = 1 dBm
Input Atten
Set the front attenuator of the RF input in order to ensure big signals (or small
signals) to pass through the mixer with low distortion (or low noise).
Key Points:
 When the preamplifier is turned on, the input attenuation could be set up to
30 dB. You can adjust the reference level to ensure that the specified
parameter meets the inequality (2-3).
 You can modify this parameter using the numeric keys, knob or direction keys.
For more details, please refer to “Parameter Setting”.
Table 2-8 Input Attenuation
Parameter Explanation
Default 10 dB
Range 0 dB to 30 dB
Unit dB
Knob Step 1 dB
Direction Key Step 5 dB
Scale/Div
Set the logarithmic units per vertical grid division on the display. This function is
only available when the scale type is set to “Log”.