Keysight Technologies N1918A Power Analysis Manager and U2000 Series USB Power Sensors Demo Guide
Introduction This demonstration guide helps you to get familiar with the basic setup and coniguration requirements to perform power measurements using the Keysight Technologies, Inc. U2000 Series USB power sensor via Keysight N1918A Power Analysis Manager. All demonstrations exercised in this guide require the U2000 Series bundled application software N1918A Power Analysis Manager Power Panel, any of the U2000 Series USB power sensors and a Keysight ESG E4438C vector signal generator. This demonstration guide includes a step-by-step demonstration of basic average and pulse measurements.
03 Keysight N1918A Power Analysis Manager and U2000 Series USB Power Sensors - Demo Guide Power Panel The Power Panel is the basic version of the Power Analysis Manager and is bundled with the purchase of a U2000 Series USB power sensor. The Power Panel provides an easy-to-use GUI that offers basic features that can be found in a typical power meter. Key Features Processes and displays multi-channel power measurements (with more than 10 channels simultaneously) Provides larger, enhanced visual display, including power versus time graph (trend chart) Performs delta and ratio computations between data from two channels Saves and restores instrument settings Stores up to 10,000 measurement points Stores data in comma separated value (CSV) iles that are compatible with Microsoft Excel Provides up to 10 frequency dependent offset (FDO) tables Supports time-gated measurement capability save image ile disconnect instrument connect instrument Menu bar Toolbar Instrument Navigator panel start measurements stop measurements create Soft Panel create Gauge create Strip Chart remove view preset save instrument settings load instrument settings save instrument screen unlock local access show error list reset instruments FDO table Instrument Properties toolbar Instrument Properties tab Gauge View Multi List View channel offset (db) duty cycle (%) input frequency in MHz Soft Panel View Figure 1. Power Panel View graphical user interface and functions U2000 Series USB Power Sensors The U2000 Series USB power sensors are average, wide dynamic range power sensors that can be used with a PC or any selected Keysight USB-based instrument. Key Features Performs power measurements without a power meter Offers a frequency range of 9 khz to 24 GHz (sensor-dependent) Provides a dynamic range from 60 dbm to +44 dbm Offers internal zeroing capability and external calibration-free measurements Allow average power measurement of CW and modulated signals, including GSM, EDGE, WLAN and WIMAX TM Figure 2. U2000 Series USB power sensor
04 Keysight N1918A Power Analysis Manager and U2000 Series USB Power Sensors - Demo Guide Demonstration Preparation The following instruments and software are required in order to perform the demonstrations illustrated in this demo guide: Keysight N1918A Power Analysis Manager (Power Panel) Keysight U2000 Series USB Power Sensors Keysight IO Libraries Suite Keysight ESG E4438C Vector Signal Generator Product type N1918A Power Analysis Manager Keysight U2000 Series USB Power Sensors Keysight ESG E4438C Vector Signal Generator Keysight Automation-Ready CD Description Power Panel Basic version Any of the USB sensors U200xA/B/H Series E4438C irmware revision C.04.60 or later Keysight IO Libraries Suite 14.2 or higher In this guide, keystrokes surrounded by [ ] represent instrument front panel keys. Connecting and Verifying ESG and U2000 Series USB Power Sensors Instructions 1. Connect the USB sensor to a PC that runs the Power Analysis Manager and the Keysight IO Libraries Suite 14.2 or higher using the USB mini-b connector. 2. Connect the other end of the USB sensor to the ESG as shown in Figure 3. 3. Go to Start > All Programs > Keysight IO Libraries Suite > Keysight Connection Expert to launch the Keysight Connection Expert application. 4. Detect and verify all connected instruments to ensure successful connections have been established. Right-click on each listed instrument in the Keysight Connection Expert and send the standard *IDN? command to the instrument for identiication. 5. Once all connected instruments have been successfully veriied, launch the Power Panel to begin. Go to Start > All Programs > Keysight N1918A Power Analysis Manager > Power Panel. 6. To start using the Power Panel, search for a connected instrument using the options available in the Find Connected Instrument panel. 7. Click Find to search for a connected instrument via the supported IO connectivity GPIB, LAN, or USB options. 8. Select the USB sensor and click Connect. The Power Panel is ready to use. 9. Select the USB sensor on the Instrument Navigator panel. On the Instrument Properties panel, click Zero to perform zeroing on the USB sensor. Connecting U2000 Series USB sensor to PC using USB mini-b connector RF Out For more information on the Power Panel installation, system requirements, setup, and usage, visit www.keysight.com/ind/n1918a. Figure 3. PC, ESG and USB power sensor coniguration diagram
05 Keysight N1918A Power Analysis Manager and U2000 Series USB Power Sensors - Demo Guide Average Power Measurement Demonstration Objective To demonstrate the capability of the Power Panel to carry out average power measurement using the U2000 Series USB power sensor. Instructions On the ESG 1. Set the instrument to default Press [Preset] 2. Set the frequency and amplitude 1. Press [Frequency] 1900 > MHz 2. Press [Amplitude] 0 > dbm 3. Turn on the RF Output Toggle [RF On/Off] to ON In the Power Panel 1. Set the frequency 1. Click Channel on the Instrument Navigator panel. 2. Set Frequency (Hz) to 1.900 G on the Instrument Properties panel. 2. Start the measurement (See Figure 4) Click on the Power Panel toolbar. Figure 4. Setting the properties in the Power Panel for average power measurements using USB power sensor
06 Keysight N1918A Power Analysis Manager and U2000 Series USB Power Sensors - Demo Guide Pulse Power Measurement Demonstration Pulse power is determined by measuring the average power of the pulse and then dividing the measurement results by the pulse cycle value to obtain the pulse power reading, as expressed by the following equation: P p = P avg / Duty Cycle The measurement result is a mathematical representation of the pulse power rather than the actual measurement with the assumption of constant peak power. To ensure accurate pulse power readings, the input signal must be a repetitive rectangular pulse with a constant duty cycle. Power B (Pulse Repetition Interval) Duty Cycle = A B Measured Average Power A (Pulse Width) Time Figure 5. Pulse power calculation Objective To demonstrate the capability of the Power Panel to carry out pulse power measurement using the U2000 Series USB power sensor. In this demonstration, we supplying a pulsed signal with the pulse width of 10 μs and a pulse period or pulse repetition interval (PRI) of 40 μs. The pulse signal is set to the power level of approximately 0 dbm. The measured average power of the signal is 6.24 dbm (See Figure 6). The duty cycle is known to be 10 μs divided by 40 μs, which is 25% this value can be conigured in the Power Panel. This generates a pulse reading of 0.22 dbm (See Figure 7). To understand what the USB power sensor does, we can look at the duty cycle calculation. The equation, Average Power = 10 log (Pulse Width/PRI), provides the difference between average power and pulse power. The calculated value in this demonstration shows that the average power is 6.02 dbm lower than the pulse power. The Power Panel makes this correction to show the pulse power using the provided duty cycle. Instructions On the ESG 1. Set the instrument to default Press [Preset] 2. Set the frequency and amplitude 1. Press [Frequency] 1900 > MHz 2. Press [Amplitude] 0 > dbm 3. Set the pulse signal 1. Press [Pulse] Pulse Period > 40 > usec 2. Pulse Width > 10 > usec 4. Activate the pulse signal Toggle Pulse On/Off to ON
07 Keysight N1918A Power Analysis Manager and U2000 Series USB Power Sensors - Demo Guide Instructions In the Power Panel 1. Set the frequency 1. Click Channel on the Instrument Navigator panel. 2. Set Frequency (Hz) to 1.900 G on the Instrument Properties panel. 2. Acquire average power measurement (See Figure 6) Click on the Power Panel toolbar. 3. Stop the power measurement Click the Stop button on the Power Panel toolbar. 4. Enable and set the duty cycle to 25% 1. Click Channel on the Instrument Navigator panel. 2. Select Duty Cycle checkbox. 3. Set the Duty Cycle (%) to 25.000. 5. Start the measurement (See Figure 7) Click on the Power Panel toolbar. Figure 6. Average power measurement of pulse signal Figure 7. Pulse power measurement with duty cycle value set to 25%
08 Keysight N1918A Power Analysis Manager and U2000 Series USB Power Sensors - Demo Guide Time-Gated Average Power Measurement Demonstration Objective To demonstrate the capability of time-gated function to carry out average power measurement of a 900 MHz GSM pulse using the U2000 Series power sensor. Instructions On the ESG 1. Set the instrument to default Press [Preset] 2. Set the frequency and amplitude 1. Press [Frequency] 900 > MHz 2. Press [Amplitude] 0 > dbm 3. Set GSM signal 1. Press [Mode], {Real Time TDMA}, {GSM}. 2. Toggle {GSM} to On. 3. Press {Data Format Framed}. 4. Turn off the Timeslot #0 1. Press {Conigure Timeslot}. 2. Toggle {Timeslot} to Off. 5. Turn on the Timeslot #5 1. Press {Timeslot #0}, {5} and {Enter}. 2. Toggle {Timeslot} to On. 6. Turn on the RF signal 1. Toggle [RF On/Off] to On. In the Power Panel 1. Set the frequency 1. Click Channel on the Instrument Navigator panel. 2. Set Frequency (Hz) to 900 M on the Instrument Properties panel 2. Set the gate 1. Click Gate on the Instrument Navigator panel. 2. Select Enable Gate to enable the gate. 3. Set gate 1 Start (s) to 2.912 m. 4. Set Length (s) to 520 μ. 3. Set instrument source to external trigger 1. Click Trigger on the Instrument Navigator panel. 2. Select Cont Trig on the Instrument Properties panel. 4. Start the measurement (See Figure 8) Click on the Power Panel toolbar. Figure 8. Time-gated average power measurement of a GSM pulse at Timeslot #5.
09 Keysight N1918A Power Analysis Manager and U2000 Series USB Power Sensors - Demo Guide References Publication title Application Note 1449-1: Fundamental of RF and Microwave Power Measurements (Part 1) Application Note 1449-2: Fundamental of RF and Microwave Power Measurements (Part 2), Application Note 1449-3: Fundamental of RF and Microwave Power Measurements (Part 3) Application Note 1449-4: Fundamental of RF and Microwave Power Measurements (Part 4) Application Note 64-4D: 4 Steps for Making Better Power Measurements Pub number 5988-9213EN 5988-9214EN 5988-9215EN 5988-9216EN 5989-8167EN Product Note: Choosing the Right Power Meter and Sensors 5968-7150EN Related Literature Publication title Data Sheet: N1918A Power Analysis Manager Installation Guide: N1918A Power Analysis Manager Technical Overview: N1918A Power Analysis Manager Data Sheet: U2000 Series USB Power Sensor Technical Overview: U2000 Series USB Power Sensor Pub number 5989-6612EN N1918A-90002 5989-6613AEN 5989-6278EN 5989-6279EN
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