Anritsu S113C Guía de usuario descargar pdf (Pagina 48)

InstaCal Module Verification

Verifying the InstaCal module before any line sweeping measurements is critical to the

measured data. InstaCal module verification identifies any failures in the module due to cir

cuitry damage or failure of the control circuitry. This test does not attempt to characterize

the InstaCal module, which is performed at the factory or the service center.

The performance of the InstaCal module can be verified by the Termination method or the

Offset method. The termination method is the preferred method in the field, and is similar

to testing a bad load against a known good load.

Termination Method

The Termination method compares a precision load against the InstaCal Module and pro

vides a baseline for other field measurements. A precision load provides better than 42 dB

directivity.

Step 1. Set the frequency according to the device under test (cellular, PCS, GSM).

Step 2.

Press the MODE key and select

FREQ-RETURN LOSS mode.

Step 3. Connect the InstaCal module to the Site Master RF OUT port and calibrate the

Site Master using the InstaCal module (page 3-6).

Step 4. Remove the InstaCal module from the RF OUT port and connect the precision

load to the RF OUT port.

Step 5. Measure the return loss of the precision load. The level should be less than 35

dB across the calibrated frequency range.

Step 6.

Press the MARKER key and set the M1 marker to

MARKER TO PEAK. The M1

value should be less than 35 dB return loss.

Step 7.

Press SAVE DISPLAY (page 3-12) name the trace, and press ENTER.

Offset Method

An alternative to the termination method is to measure the return loss of a 20 dB offset.

This is similar to measuring an antenna that has been specified to have a 20 dB return loss

across the frequency of operation. A 20 dB offset provides a 20 dB return loss across a very

wide frequency range. Measuring the return loss with the 20 dB offset will provide a rela

tively flat response across the operating frequency range of the Site Master models (S113C,

S114C, S331C, and S332C).

Step 1. Set the frequency according to the device under test (cellular, PCS, GSM).

Step 2.

Press the MODE key and select

FREQ-RETURN LOSS mode.

Step 3. Connect the InstaCal module to the Site Master RF OUT port and calibrate the

Site Master using the InstaCal module (page 3-6).

Step 4. Remove the InstaCal module from the RF OUT port and connect the 20 dB Off

set to the RF OUT port.

Step 5. Measure the return loss of the 20 dB Offset. The level should be 20 dB, ±2dB

across the calibrated frequency range.

Step 6.

Press the MARKER key and set the M1 marker to

MARKER TO PEAK. The M1

value should be approximately 20 dB return loss.

Step 7.

Press SAVE DISPLAY (page 3-12) name the trace, and press ENTER.

3-5

Chapter 3 Getting Started

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