Agilent Technologies E7401A, E7402A, E7403A, E7404A, E7405A Reflection Calibration

Chapter 2 85

Making Complex Measurements

Making a Reflection Calibration Measurement

Reflection Calibration

1. Connect the DUT to the direction a l bridge or coupler as shown in

Figure 2-13. Terminate the unconnected port of the DUT.

NOTE If possible, use a coupler or bridge with the correct te st po rt co n n e cto r

for both calibrating and measuring . Any adapter between the test port

and DUT degrades coupler/bridge directivity and system source match.

Ideally, you should use the same adapter for the calibration and the

measurement. Be sure to terminate the second port of a two port device.

2. Connect the tracking generator output of the analyzer to the

directional bridge or c oupler.

3. Connect the analyzer input to the coupled port of the directional

bridge or coupler.

4. Perform a factory preset by pressing Preset, Factory Preset (if

present).

5. Set the Y-Axis Units to dBm by pressing AMPLITUDE, More,

Y-AxisUnits, dBm.

6. Turn on the tracking generator and if necessary, set the output

power to –10 dBm by pressing Source, Amplitude (On), –10, dBm.

CAUTION Excessive signal input may damage the DUT. Do not exceed the

maximum power that the device und er test can tolerate.

7. Set the span to 100 MHz by pressing SPAN, Span, 100, MHz.

8. Set the center frequ e n c y to 200 MHz by pressing FREQUENCY,

Center Freq, 200, MHz.

9. Set the resolution bandwidth to 3MHz by pressing BW/Avg, Res BW,

3, MHz.

10.Replace the DUT with a short circuit.

11.Normalize the trace by pressing Trace/View, More, Normalize,

StoreRef (1→3), Normalize (On). See Figure2-14.

This will activate the trace 1 minus trace 3 function and display the

results in trace 1. The normalized trace or flat line represents 0 dB

return loss. Normalization occurs ea ch sw eep. Replace the short

circuit with the DUT.

NOTE Since the reference trace is stored in trace 3, changing trace 3 to

Clear Write will invalidate t h e n o rm alization.

Contents

Main Signal Analysis Measurement Guide Agilent Technologies EMC Series Analyzers Notice Safety Information Warrant y LIMITATION OF WARRANTY EXCLUSIVE REMEDIES Where to Find the Latest Informa tion Page Contents Page What is in This Chapter Test Equ ipm ent Comparing Signals Signal Comparison Example 1: Page Signal Comparison Example 2: Page Resolving Signals of Equal Amplitude Resolving Signals Example: Page Page Resolving Small Signals Hidden by Large Signals Resolving Signals Example: Page Page Making Better Frequency Measurements Better Frequency Measurement Example: Page Decreasing the Frequency Span Around the Signal Decreasing the Frequency Span Example: Page Page Tracking Drifting Signals Tracking Signal Drift Example 1: Page Page Tracking Signal Drift Example 2: Page Page Page Measuring Low Level Signals Measuring Low Level Signals Example 1: Page Measuring Low Level Signals Example 2: Measuring Low Level Signals Example 3: Page Measuring Low Level Signals Example 4: Page Page Identifying Distortion Products Distortion from the Analyzer Identifying Analyzer Generated Distortion Example: Page Page Third-Order Intermodulation Distortion Identifying TOI Distortion Example: Page Page Page Measuring Signal-to-Noise Signal-to-Noise Measurement Example: S/N 70 dB/Hz10 30 kHz()log+ 25.23 dB30 kHz()== Making Noise Measurements Noise Measurement Example 1: Page Page Page Page Noise Measurement Example 2: Noise Measurement Example 3: Page Page Demodulating AM Signals (Using the Analyzer As a Fixed Tuned Receiver) Demodulating an AM Signal Example 1: Page Page Page Page Page Demodulating FM Signals Demodulating a FM Signal Example: Page Page Page Page Whats in This Chapter Required Test Equipment Making Stimulus Response Measu rements What Are Stimulus Response Measurements? Using An Analyzer With A Tracking Generator Stepping Through a Transmission Measurement Page Page Page Page Tracking Generator Unleveled Condition Measuring Device Bandwidth Page Page Measuring Stop Band Attenuation Using Log Sweep Page Page Page Page Making a Reflection Calibration Measurement Example: Reflection Calibration Measuring the Return Loss Chapter 2 87 VSWR 110 Making Complex Measurements Making a Reflection Calibration Measurement -----------------------= Table 2-1 Power to VSWR Conversion + 110 Demodulating and Listening to an AM Signal Demodulating and Listening to an AM Signal Example 1: Demodulating and Listening to an AM Signal Example 2: