Anritsu S251B manual 4-16, DTF Measurement, Required Equipment, Device-Under-TestSpecification

Chapter 4 Measurements

DTF Measurement

The following distance domain measurement is an example of a Distance-to-Fault (DTF) measurement over a selectable distance range.

Required Equipment

￿Site Master Model S251B

￿Precision Open/Short, Anritsu 22N50 and Precision Load, Anritsu SM/PL

or

Precision Open/Short/Load, Anritsu OSLN50LF

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

Device-Under-Test Specification

Type	Typical Loss @1.5m	Vg	Return	SWR
			Loss
	0.4 dB @ 625 MHz
15NNF50-1.	0.5 dB @ 800 MHz
	0.6 dB @ 1000 MHz	0.86	￿ 21 dB	￿ 1.20
5A	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 DTF-SWRor DTF-RETURN LOSS.

Step 4. Press the ENTER key to select DTF-SWR or Return Loss measurement mode. If the Site Master has not been calibrated (CAL OFF displayed in the upper left of the display), the DTF AID parameter table will appear.

NOTE: Where CAL ON is indicated on the Site Master, pressing the DTF AID soft key will activate the DTF parameter table. However, distance and cable type (propagation velocity and loss) have not been optimized. F1 and F2 are set by “CAL ON” setup. DTF measurement is valid for D2 ￿ Dmax (as defined by F2 and F1).

The number of data points (resolution) will automatically adjust according to the length of D2.

Step 5. Use the Up/Down arrow key to scroll to D2, then press ENTER to select the ca- ble length.

Step 6. Enter 2 using the keypad or the Up/Down arrow key. Press ENTER to set D2 to 2.0 meters.

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