Spectrum Analyzer 2-12 Field Strength
Spectrum Analyzer MG PN: 10580-00349 Rev. H 2-15
2-12 Field Strength
Required Equipment
Portable Antenna for which antenna factors or antenna gain and bandwidth data are
available.
Procedure
1. Press the Shift key then the Measure (4) key. Then press the Power and Bandwidth
submenu key, and press the Field Strength submenu key followed by pressing the On/Off
submenu key so that On is underlined.
2. Press the Antenna submenu key to display the loaded antenna profiles with their model
number and frequency range. Use the up or down arrow keys or the rotary knob to
select the desired antenna. Press the Enter key to select or ESC to cancel.
3. Connect the antenna to the RF In port.
4. Press the Freq main menu key, press the Center Freq submenu key, and enter the
center frequency.
5. Press the Span main menu key. Set the span wide enough to include the primary
channel bandwidth and upper and lower channel bandwidths. At least a portion of the
span has to include a frequency within the antenna’s specified range.
6. Press the BW main menu key and verify that Auto RBW and Auto VBW are On.
7. To change the units of measurement, press the Amplitude main menu key, then press
the Units submenu key and press dBm/m
2
, dBV/m, dBmV/m, dBµV/m, Volt/m, Watt/m
2
,
dBW/m
2
, A/m, dBA/m, or Watt/cm
2
. The instrument automatically adjusts the
measurement by the antenna factors selected. Marker values will be displayed in the
same units as selected for amplitude.
Antenna Calculations
The following is a list of various antenna calculations should you find it necessary to convert
from one parameter to another:
Conversion of signal levels from watts to volts in a 50 ohm system:
P = V
2
/R
where:
P = power in Watts
V = voltage level in Volts
R = resistance in ohms
Note that 1mW = 10
–3
W and 1µV = 10
–6
V.
For power in dBm, and voltage in dB (µV):
V
dB(µV)
= P
(dBm)
+ 107 dB
Note
Select an antenna from the standard list available or use the Antenna Editor
feature of Anritsu Master Software Tools to define a custom antenna and upload
the antenna information to the antenna list.
ООО "Техэнком" Контрольно-измерительные приборы и оборудование www.tehencom.com
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