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7ghz spectrum analyzer operation manual ⎯ ⎯ 39 – GW Instek GSP-827 User Manual User Manual

Page 40

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2.7GHz Spectrum Analyzer Operation Manual

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

0

1

2

3

7

6

5

4

8

9

.

-

Input Z

Cal