GW Instek GSP-827 User Manual - Manual (Page 40)

2.7GHz Spectrum Analyzer Operation Manual
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39
8.1.3 Amplitude
Reference Level is the top level on the display. The level of input signal is recommended to
be under the reference level to have accurate result.
The Scale can be switched in 10-5-2-1 dB sequence. Note that the accuracy will not change
following the scale change. It is a graphical Zoom in function.
Unit includes dBm, dBuV, dBmv and dBm/Hz. There is a transformation factor 107 between
dBm and dBuV.under 50Ω system, and 47dB factor between dBm and dBmV. The dBm/Hz
is the so-called noisy marker which normalizes the reading into 1Hz bandwidth.
ExtGain/Loss allows the amplitude offset caused by user’s application.
InputZ can toggle the input impedance between 50Ω and 75Ω. Note the 50Ω and 75Ω
switch here is a software adjustment. Input Z Cal offers the compensation entry of the 75Ω
adaptor. The ideal number is at 5.9dB
Amplitude
F1
F3
F4
F5
F6
Center
Start
stop
Step
Peak-
>Center
Ref
Level
Unit
dBm
Scale
10 dB
Ext Gain
Loss
Input Z
50 Ω 0
1 2 3
7
6 5 4
8 9
. -
Input Z
Cal