Anritsu S251B manual SWR Return Loss and Cable Loss Measurement, Required Equipment, Procedure

Chapter 4 Measurements

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

Type	Typical Loss @1.5m	Vg	Return Loss	SWR
	0.4 dB @ 625 MHz
	0.5 dB @ 800 MHz
15NNF50-1.5A	0.6 dB @ 1000 MHz	0.86	￿ 21 dB	￿ 1.20
	0.7 dB @ 1500 MHz
	0.8 dB @ 2000 MHz
	0.9 dB @ 2500 MHz

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-SWRor 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).

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