Units - SAF 0.3-3 GHz Spectrum Compact User Manual

0.3-3 GHz SPECTRUM COMPACT (FW V5.2.6)

2.7.4 UNITS

The UNITS submenu allows changing the displayed units of the spectrum analyzer.
There are 6 logarithmic units available.
Power units:

dBm (the default units) – decibels referenced to one milliwatt

dBuW – decibels referenced to one microwatt
Voltage units:

dBmV – decibels referenced to one millivolt

dBuV – decibels referenced to one microvolt
Current units:

dBmA – decibels referenced to one milliampere

dBuA – decibels referenced to one microampere
The input power values are converted for the vertical axis, reference level REF
indication and for Center, MARKER and POWER IN BAND readouts.
Only the displayed units on the Spectrum Compact are changed, the power
values are still detected and stored in dBm.

dBuV/m
The "dBuV/m" submenu allows placing a special marker, which shows the electric
field strength at the specified frequency in decibels referenced to one microvolt per
meter. The electric field strength is calculated from the detected input power level
value at the specified frequency.
"dBuV/m" marker is not compatible with the regular MARKER and POWER IN
BAND and with non-default units – the input power values for the vertical axis
and reference level REF indication will be displayed in dBm.
The parameters required for the calculation are:

gain of the receiver antenna GAIN, in dBi;

the MARKER frequency;

(optional) LOSSES value to account for any known additional losses e.g.
cables, rain, obstacles, in dB.
The currently selected parameter (GAIN/ MARKER/ LOSSES) is displayed in white.
To select a different parameter, tap on it once. The color of the keypad buttons shows
which numbers can be entered at the current digit position to obtain a valid parameter
value – the numbers on the
buttons cannot be entered. If the currently entered value is valid, it is displayed in
green (also OK button is green). If the value is not valid, it is displayed in
button is red). To confirm a valid value, tap the OK button or tap the selected
parameter's box
green buttons can be entered, the numbers on the
17
OPERATION
red
red (also OK