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SWR (Return Loss) and Cable Loss Measurement
The following frequency domain measurement is an example of a Standing Wave Ratio (or
Return Loss) and Cable Loss measurement made over a selectable frequency range. This
measurement example determines the quality and loss of the test port cable or device under
test.
Required Equipment
·
Site Master Model S251B
·
Precision N (m) Open/Short, Anritsu 22N50 and
Precision N (m) Load, Anritsu SM/PL
or
Precision N (m) Open/Short/Load, Anritsu OSLN50LF
·
N (m) - N (f) Test Port Extension Cable, Anritsu 15NNF50-1.5A
Device-Under-Test Specification
Procedure
Step 1. Press the ON/OFF key on the Site Master.
Selecting the Measurement Mode
Step 2. Press the MODE key.
Step 3. Use the Up/Down arrow key to scroll to
FREQ-SWR or FREQ-RETURN LOSS.
Step 4. Press the ENTER key to select Frequency SWR or Return Loss measurement
mode.
Selecting the Frequency Range
Step 5. Press the FREQ/DIST key.
Step 6. Press the
F1 soft key.
Step 7. Enter 6, 2, 5 using the key pad or the Up/Down arrow key.
Step 8. Press
ENTER to set F1 to 625 MHz.
Step 9. Press the
F2 soft key.
Step 10. Enter 2, 5, 0, 0 using the keypad or the Up/Down arrow key.
Step 11. Press
ENTER to set F2 to 2500 MHz.
Step 12. Check that the FREQ (MHz) scale in the display area indicates the new fre
-
quency start and stop values (F1 = 625 MHz, F2 = 2500 MHz).
4-9
Chapter 4 Measurements
Type Typical Loss @1.5m V
g
Return Loss SWR
15NNF50-1.5A
0.4 dB @ 625 MHz
0.5 dB @ 800 MHz
0.6 dB @ 1000 MHz
0.7 dB @ 1500 MHz
0.8 dB @ 2000 MHz
0.9 dB @ 2500 MHz
0.86 ³ 21 dB £ 1.20