21
Auto Scale
To set the highest resolution for Y axis of current screen on condition that the signal
is full displayed. A reference level is set automatically and ensures the peak of
signal always on the topmost of grid for best view of tracing line.
Figure 2-2 Before Auto Scale
Figure 2-3 After Auto Scale
Ref Level
Set the reference level, indicates at the top scale as amplitude power or voltage.
When change the reference level, the topmost scale of absolute amplitude level
changes accordingly shown at the upper left of the display grid.
Key points:
Maximum reference level is affected by combination of maximum mixing level, input
attenuation and preamplifier. When adjust it, the input attenuation is adjusted under
a constant max mixing level, meeting:
L
Ref
, a
RF
, a
PA
and
L
mix
denote reference level, input
attenuation, preamplifier and maximum mixing level.
You can modify this parameter by numeric keys, knob and arrow keys. For more
details, please refer to “Paramter Input”.
Table 2-6 Reference Level
Input Atten
Set the front attenuation of the RF input in order to permit big signals (or small
signals) to pass from the mixer with low distortion (or low noise).
Parameter
Description
Default
0dBm
Range
-100 dBm ~ 30 dBm
Unit
dBm, -dBm, mV, uV
Knob Step
in Log scale mode, step=scale/10
in Lin scale mode, step=0.1 dBm
Arrow Keys Step
in Log scale mode, step=scale
in Lin scale mode, step=1 dBm
