Assessments - 4, GPA: 4
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Site Master S332C ON/OFF KEY Figure 3-1. Site Master On/Off Key Chapter 3 Getting Started Select the Frequency or Distance Regardless of the calibration method used, the frequency range for the desired measurements must be set before calibrating the Site Master. The following procedure selects the frequency range for the calibration. Step 1. Press the FREQ/DIST key. Step 2. Press the F1 soft key. Step 3. Enter the desired start frequency using the key pad or the Up/Down arrow key. Step 4. Press ENTER to set F1 to the desired frequency. Step 5. Press the F2 soft key. Step 6. Enter the desired stop frequency using the keypad or the Up/Down arrow key. Step 7. Press ENTER to set F2 to the desired frequency. Check that the start and stop frequencies displayed match the desired measurement range. Calibration For accurate results, the Site Master must be calibrated before making any measurements. The Site Master must be re-calibrated whenever the setup frequency changes, the temperature exceeds the calibration temperature range or when the test port extension cable is removed or replaced. The Site Master may be calibrated manually with Open, Short, Load (OSL) calibration components, or by using the InstaCal module provided with the system. If a Test Port Extension Cable is to be used, the Site Master must be calibrated with the Test Port Extension Cable in place. The Test Port Extension Cable is a phase stable cable and is used as an extension cable on the test port to ensure accurate and repeatable measurements. This phase stable cable can be moved and bent while making a measurement without causing errors in the measurement. NOTE: The test port extension cable should have the appropriate connectors for the measurement. Use of additional connector adapters after the test port extension cable can contribute to measurement errors not compensated for during calibration. Chapter 3 Getting Started Calibration Verification During the calibration process in Return Loss mode, either with discrete calibration components or with the InstaCal module, there are typical measurement levels expected. Verifying the measurement levels displayed on the screen during calibration can save valuable time in the field. Trace Characteristics in Return Loss Mode As the discrete calibration components are connected to the Site Master RF out port, the following measurement levels will be displayed on the screen: • When an OPEN is connected, a trace will be displayed between 0-10 dB. • When a SHORT is connected, a trace will be displayed between 0-10 dB. • When a LOAD is connected, a trace will be displayed between 0-50 dB. When an InstaCal module is connected to the Site Master RF out port, the following measurement levels will be displayed on the screen: • When the Site Master is measuring an equivalent OPEN, a trace will be displayed between 0-20 dB. • When the Site Master is measuring an equivalent SHORT, a trace will be displayed between 0-20 dB. • When the Site Master is measuring an equivalent LOAD, a trace will be displayed between 0-50 dB. The following procedures explain Manual and InstaCal calibration methods. Refer to Figure 3-2 for a calibration setup diagram. Manual Calibration Procedure If the “CAL OFF” message is displayed, or the test port cable has been changed, a new calibration is required. The following procedure details how to perform the calibration. Step 1. Select the appropriate frequency range, as described in the procedure above. Step 2. Press the START CAL key. The message “CONNECT OPEN or InstaCal TO RF Out PORT” will appear in the display. Step 3. Connect the calibrated Open and press the ENTER key. The messages “Measuring OPEN” and “CONNECT SHORT TO RF Out” will appear. Step 4. Remove the Open, connect the calibrated Short and press the ENTER key. The messages “Measuring SHORT” and “CONNECT LOAD TO RF Out” will appear. Step 5. Remove the Short, connect the calibrated Termination and press the ENTER key. The messages “Measuring LOAD” will appear. Step 6. Verify that the calibration has been properly performed by checking that the “CAL ON” message is now displayed in the upper left corner of the display. 3-4 Chapter 3 Getting Started HOLD RUN START CAL AUTO SCALE SAVE SETUP RECALL SETUP LIMIT MARKER SAVE DISPLAY RECALL DISPLAY PRINT MODE FREQ/DIST AMPLITUDE SWEEP SYS ENTER CLEAR ESCAPE ON OFF / 1 2 4 5 6 7 8 9 0 3 +- . Site Master S332C OPEN LOAD SHORT CALIBRATION RFOUT/REFLECTION TEST PORT TEST PORT CABLE (OPTIONAL) Figure 3-2. Calibration Setup Chapter 3 Getting Started 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 circuitry 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 Termin...
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