Anritsu S113C Guide de l'utilisateur télécharger pdf (Page 111)

Antenna used for radiated emissions testing are individually calibrated (the antenna factors

can be measured directly) at all appropriate distances. The calibrations produce values that

are defined the “equivalent free space antenna factor.” The calibration procedure corrects

for the presence of the reflection of the antenna in the ground plane, giving the value that

would be measured if the antenna were in “free space.”

Antenna Editor

Step 1.

Once Software Tools has been opened, select Antenna Editor from the Tools

menu on the tool bar. A pop-up box will appear on the screen of the PC.

Step 2. Click on “Edit Antenna” to enter an antenna name, description, frequencies, and

antenna factors. Enter the frequencies in ascending order, starting with lowest

frequency first. A maximum of 60 antenna factors may be entered. Use the ar

row keys on the keyboard to move between entries.

NOTE: Only one input of frequency and antenna factor is allowed per row. Mul

tiple antenna factors for a single antenna must be entered individually. For ex

ample, an antenna having an antenna factor of 5 from 2.0 to 2.25 GHz and an

antenna factor of 4 from 2.25 to 2.5 GHz should be entered as follows:

If necessary, an antenna factor of zero (0) may be entered.

Step 3.

Select Save from the File menu to save the antenna factors to the hard disk.

Uploading Antenna Factors

All 10 available antennas are transferred to the instrument at the same time. To modify only

a single antenna in the instrument, first download the current antennas (see below) then

modify the appropriate antenna, then re-upload the antennas to the instrument.

To upload antenna information from Software Tools to the instrument:

Step 1. Connect the RS232 cable between the PC and the instrument.

Step 2.

Click on the Upload button on the tool bar (or select Upload from the Tools

menu). It is important to note that the instrument must sweep very quickly dur

ing the data transfer, at least every 5 seconds, or the Software Tools program

may “time-out.” To improve the chances of a successful upload, increase the

RBW and VBW settings to the maximum, or set the span to 0, temporarily.

Step 3.

The antennas available can be viewed by pressing the MEAS key, then the

FIELD STRNGTH and SELECT ANTENNA soft keys.

7-8

Chapter 7 Software Tools Program

Frequency (MHz) Antenna Factor

2000 5

2251 4

2500 4

1 2 ... 106 107 108 109 110 111 112 113 114 115 116 ... 119 120

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Anritsu S113C Guide de l'utilisateur Page 111