Chapter 3 Spectrum Analysis Operation
Setting up the level parameters
9102 Handheld Spectrum Analyzer Software version 5.31
61
Changing the vertical
scale
The scale for the vertical axis (power) can be changed in the range
from 1 to 20 dB per division (vertical line in the displayed grid) in 1-3-
5 steps as follows:
1 From the main menu, select
Level.
2 Push the
Scale softkey.
The Scale input field opens.
3 Select a new scale by entering a new number of dB per division
numerically and pressing the E
NTER or MHZ/DB/ΜS key, or by
pushing the U
P/DOWN cursor keys.
Selecting the level unit
for input and output
1 In the main menu, select Level > Units.
2 You can use logarthmic or linear units. In order to toggle the
display between logarithmic and linear units press the
Unit softkey
in the lower right corner of the display and select log or lin.
3 You can now choose between the following units via the Unit
softkey in the upper right corner of the display.
Logarithmic units: dBM, dBμV, dBmV and dBV
Linear units: V, mV, μV, mW, μW.
Compensating gains and
losses
If the device under test is connected to the 9102 Handheld Spectrum
Analyzer via an amplifier or a device attenuating the signal, such as an
antenna or a long cable, the measurement results are wrong by the
gain or loss factor. This factor may be a constant or even frequency-
dependent.
To view the correct measurement results, the gain or loss can be
compensated. The 9102 can even compensate a frequency-depen-
dent factor; a correction curve or table can be entered on an external
PC using the 9100 Data Exchange Software and loaded to the 9102.
The section “Defining and loading external coupling parameters” on
page 243 explains this part in more detail.
Enabling external device
compensation
Once correction values are stored in the 9102, they can be selected
and activated as follows:
NOTE
The attenuation value of 0 dB can be set only with the numeric keys
to avoid accidental deactivation. The 0 dB setting should be selected
carefully because too high input levels at the input may damage the
instrument.
NOTE
For precision measurements, the input level subtracted by the atten-
uation should not exceed –23 dBm.
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