Anritsu S251C manual Insertion Loss Measurement, Procedure - Cable Loss Mode, Insertion Loss M1 M2

Chapter 4 Measurements

Insertion Loss Measurement

The transmission feed line insertion loss test verifies the signal attenuation level of the ca- ble system in reference to the specification. This test can be conducted with the Site Master in either FREQ–CABLE LOSS or FREQ–RETURN LOSS mode. In Cable Loss mode, the Site Master automatically considers the signal traveling in both directions when calculating the insertion loss, making the measurement easier for the user in the field. Both methods are explained below.

Required Equipment

￿Site Master Model S251C

￿Precision Open/Short, Anritsu 22N50 or Precision Open/Short/Load, Anritsu OSLN50LF

￿Precision Load, Anritsu SM/PL

￿Test Port Extension Cable, Anritsu 15NNF50-1.5C

￿Optional 510-90 Adapter, DC to 7.5 GHz, 50 ohm, 7/16(F)-N(M)

Device Under Test

￿Transmission Feed Line with Short

Procedure - Cable Loss Mode

Step 1. Press the MODE key.

Step 2. Select FREQ-CABLE LOSS using the Up/Down arrow key and press ENTER. Step 3. Set the start and stop frequencies, F1 and F2, as described on page 3-2.

Step 4. Connect the Test Port Extension cable to the RF Out port and calibrate the Site Master as described on page 3-2.

Step 5. Save the calibration set up (page 3-5).

Step 6. Connect the Device Under Test to the Site Master phase stable Test Port Exten- sion cable. A trace will be displayed on the screen as long as the Site Master is in sweep mode.

Step 7. Press the AMPLITUDE key and set the TOP and BOTTOM values of the dis- play. In the example below, the TOP is set to 2, and the BOTTOM is set to 5.

Step 8.

Step 9.

Step 10.

Step 11.

Step 12.

Step 13.

Press the MARKER key.

Set M1 to MARKER TO PEAK.

Set M2 to MARKER TO VALLEY.

Calculate the measured insertion loss by averaging M1 (marker to peak) and M2 (marker to valley) as follows:

Insertion Loss￿ M1￿ M2

2

Press SAVE DISPLAY (page 3-5) name the trace, and press ENTER.

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