Agilent CSA Spectrum Analyzer N1996A

Transcription

1 Agilent CSA Spectrum Analyzer N1996A Demonstration Guide Introduction This step-by-step demo guide will help you explore the unprecedented value of the Agilent CSA spectrum analyzer for meeting your design, test and measurement challenges. Demos 1. Physical Attributes and Features Large, high resolution screen Robust Connectivity options Easy-to-use UI Size/weight 2. Performance TOI (distortion) DANL w/ preamp (noise) 1-dB step attenuation 3. Stimulus/Response Measurement Suite Two-port insertion loss Distance to fault 4. Automatic Features Auto-scale Auto-tune Auto-range 5. Measurements Spectrogram Occupied bandwidth Adjacent channel power Many of these demos are also available in the online demo at

2 1Demo Physical Attributes and Features The industry-leading attributes of the Agilent CSA are shown in Figure 1. Tracking generator and bridge (license enabled, 3 or 6 GHz) Largest display with best resolution 21.3 cm (8.4 in), color XGA LCD Most notable is the large screen, which is the same screen that we use on our high-performance spectrum analyzers. The bail handle allows you to setup the analyzer in an easily viewable configuration as well as easily carry it to where the measurement needs to be made. The USB ports, shown in Figure 2, enable these functions: 20 cm (7.8 in) 25 cm (9.7 in) 48 cm (18.8 in) 7.5 kg / 8.5 kg w/batteries USB +33 dbm (2W) Type N connector Firmware upgrades Screen shot transfer to a PC Figure 1. N1996A Trace data transfer to PC or Agilent CSA State capture transfer to PC or Agilent CSA Built-in bridge and tracking generator for Stimulus/Response measurements. Other analyzers require an external bridge to make these measurements. The Agilent CSA analyzer is extensible, providing two open slots for expansion as shown in Figure 3. This future-proofing is a benefit not seen in many instruments. Batteries (opt) Connection for power adapter Figure 2. Back of N1996A USB 10/100BT LAN Ext ref Ext trig Kennsington lock for secure cable The analyzer is robust. This is evidenced from its ruggedized design with metal shielding and housing as well as rubber feet protect the instrument. 2 Figure 3. Open back

3 2Demo Excellent Performance The Agilent CSA provides excellent performance in its class, offering a mix of performance and features to meet your design, test, or measurement challenges: +18 dbm TOI (nominal) -146 dbm DANL (w/ PreAmp) 1 db Step Attenuation Fast Narrow RBW Sweep Speeds Third Order Intercept (TOI) Two sources are needed to demonstrate TOI using the following steps. 1. First connect two sources outputting CWs with a 1 MHz spacing at 0 dbm. 2. Enter the Spectrum Analyzer mode. Mode > Spectrum Analyzer 3. Set the attenuation. AMPTD > Elec. Atten > ## 4. Set the start and end frequencies. FREQ > Start Freq > ## FREQ > Stop Freq > ## Set these to capture the span including the two CWs and the intermodulation distortion product at an offset of 1 MHz (high or low). 5. Use the auto-scale function and markers to align the signal on the screen to make it easily viewable and measurable. 1-dB Step Attenuation Change the setting in the AMPTD menu to demonstrate the 1 db adjustability. Fast Narrow RBW Sweep Speeds The Agilent CSA sweeps faster than most analyzers in wide spans and narrow RBWs. This capability can be seen with many configurations, such as: a 1 GHz span and a 3 khz RBW. To setup this configuration follow these steps: 1. Preset the instrument. 2. Set the span. SPAN > 1 > GHz 3. Set the RBW. BW > 3 > khz DANL The noise floor on the Agilent CSA permits you to see very low signals. The Agilent CSA will automatically choose a resolution bandwidth that helps view the signals of interest in a reasonable amount of time by making the trade-off between sweep time and noise floor. Leave the RBW set to automatic and use the pre-amp. To demo the DANL, follow these steps: 1. Turn on the pre-amp. AMPTD > More > Internal Preamp (On) 2. Set the frequency. FREQ > 1 GHz 3. Set the span. SPAN > 1 khz 4. Lower the RBW. BW > 10 Hz 5. Autoscale to see the signal. AMPTD > Autoscale 3

4 3Demo Stimulus/Response Measurement Suite The Stimulus/Response (S/R) Measurement Suite comprises four measurements: Two-port Insertion Loss, One-port Insertion Loss, Distance-to-Fault (DTF), and Return Loss. In order to demonstrate these measurements, a DUT is required. For two-port insertion loss, a filter is recommended. For all other measurements, some length of cable is required. Two different measurements are shown below: Two-port Insertion Loss and Distance-to-Fault. Two-Port Insertion Loss 1. Enter the two-port insertion loss Mode > Stimulus/Response > measurement. two-port Insertion Loss 2. Set the start and end frequencies. FREQ > Start Freq > ## FREQ > Stop Freq > ## 3. Normalize for the measurement. FREQ > Normalize Then follow the instructions displayed on screen. 4. After this, connect your DUT. The Agilent CSA now displays the two-port insertion loss of your DUT. Distance to Fault 1. Enter the distance-to-fault Mode > Stimulus/Response > measurement. Distance-to-Fault 2. Input your start and stop distances. FREQ > Start Distance > ## FREQ > Stop Distance > ## This automatically sets the start and stop frequencies. 3. Select your cable type. Meas. Setup > Cable Type > Select Cable 4. Calibrate the measurement. FREQ > Calibrate Then follow the on-screen instructions for the calibration sequence (open/short/load). 5. Finally, connect the cable to be AMPTD > Autoscale measured and observe the results. The display can be scaled easily by using the auto-scale function. Figure 4. Stimulus/response two-port insertion loss 4 Figure 5. Stimulus/response distance to fault

5 4Demo Automatic Features The automatic features of the Agilent CSA enhance your measurement experience. They make measurements more efficient for expert users and more effective for students. The primary automatic features are: 1. Auto-Scale 2. Auto-Tune 3. Auto-Range Each of these can be demonstrated separately. Auto-Scale Auto-scale is designed to give the best view of the signal with very few key strokes. Choose a signal that would otherwise be difficult to show on an analyzer or choose the noise-floor as a measurement specimen. 1. Activate auto-scale. AMPTD > Autoscale Auto-Tune To demonstrate the auto-tune feature well, a distinct (higher power) input signal should be present. The auto-tune feature will search the spectrum looking for the most powerful signal and then attempt to zoom around it and display it near the center of the screen. 1. Activate the feature. Auto-Tune If you want to change the settings, use Undo Auto-Range Auto-ranging ensures accurate measurement by automatically controlling the attenuator and pre-amp to adjust for the input signals. It performs a full-band background sweep, optimizing input attenuation and preamplifier settings to ensure that off-screen signals are not compressing the RF gain stage. To demonstrate this capability, perform the following: 1. Enable auto-ranging. AMPTD > Auto Range (On) 2. Observe the status bar above the graticule displaying the preamplifier status (Preamp On) and the attenuation (Atten: 0 db). Figure 6. Analyzer setup keypad 3. Connect the 10 MHz Reference (REF OUT ) from the back of the instrument to the RF input on the front panel. 4. Observe the status bar again. The Preamplifier is now off and some attenuation has been inserted. The instrument automatically adjusts for the presence of the large signal to ensure no compression occurs. 5

6 5Demo Measurements The Agilent CSA has several built-in measurements with more to come. An input CDMA signal is needed to create the spectrogram display shown in Figure 7. Spectrogram The spectrogram view allows you to view signals changing over time. It can be used for interference analysis, circuit stability, etc. 1. Set the signal to the proper scale AMPTD > Autoscale before enabling the Spectrogram view. The color scale of the spectrogram directly corresponds to position (vertical) on the graticule. 2. Enable the spectrogram view in the View/Display > Spectrogram > On Spectrum Analyzer mode. Figure 7. Spectrogram 6

7 5Demo Measurements (continued) Occupied Bandwidth (OBW) The Occupied Bandwidth measurement in the Agilent CSA will be of use for determining the power and bandwidth of modulated signals. 1. Activate this measurement in the Meas > Occupied BW Spectrum Analysis mode. 2. There are then several parameters Meas Setup in the measurement than can be This will allow you to demonstrate the power adjusted to view these. of the measurement to your customer. Further Information For further information regarding the Agilent CSA, including ordering information, brochures, datasheets, and on-line demos please refer to: Adjacent Channel Power (ACP) 1. Activate the measurement. Mode > Channel Analyzer > Adjacent Channel Power 2. Configure the measurement. Meas Setup In this menu, change the format type to the input signal that you have connected. Note: Center Frequency can also be changed in the same manner as the above demos. 3. Activate limit lines. Meas Setup > Limits > Power Limits > On This will allow you to display the pass/fail capability of the measurement. Figure 8. Adjacent channel power 7

8 Agilent Technologies Test and Measurement Support, Services, and Assistance Agilent Technologies aims to maximize the value you receive, while minimizing your risk and problems. We strive to ensure that you get the test and measurement capabilities you paid for and obtain the support you need. Our extensive support resources and services can help you choose the right Agilent products for your applications and apply them successfully. Every instrument and system we sell has a global warranty. Two concepts underlie Agilent s overall support policy: Our Promise and Your Advantage. Our Promise Our Promise means your Agilent test and measurement equipment will meet its advertised performance and functionality. When you are choosing new equipment, we will help you with product information, including realistic performance specifications and practical recommendations from experienced test engineers. When you receive your new Agilent equipment, we can help verify that it works properly and help with initial product operation. Your Advantage Your Advantage means that Agilent offers a wide range of additional expert test and measurement services, which you can purchase according to your unique technical and business needs. Solve problems efficiently and gain a competitive edge by contracting with us for calibration, extra-cost upgrades, out-of-warranty repairs, and on-site education and training, as well as design, system integration, project management, and other professional engineering services. Experienced Agilent engineers and technicians worldwide can help you maximize your productivity, optimize the return on investment of your Agilent instruments and systems, and obtain dependable measurement accuracy for the life of those products. Agilent Open Agilent Open simplifies the process of connecting and programming test systems to help engineers design, validate and manufacture electronic products. Agilent offers open connectivity for a broad range of system-ready instruments, open industry software, PC-standard I/O and global support, which are combined to more easily integrate test system development. Agilent Updates Get the latest information on the products and applications you select. Agilent Direct Quickly choose and use your test equipment solutions with confidence. For more information on Agilent Technologies products, applications or services, please contact your local Agilent office. The complete list is available at: Phone or Fax United States: (tel) (fax) Canada: (tel) (fax) China: (tel) (fax) Europe: (tel) Japan: (tel) (81) (fax) (81) Korea: (tel) (080) (fax) (080) Latin America: (tel) (305) Taiwan: (tel) (fax) Other Asia Pacific Countries: (tel) (65) (fax) (65) tm_ap@agilent.com Contacts revised: 05/27/05 Product specifications and descriptions in this document subject to change without notice. Agilent Technologies, Inc Printed in USA, May 16, EN