Ladybug USB PowerSensor+ LB A Series Скачать руководство пользователя страница 34 | Manualshive

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LBXXXA Series USB Powe

™

Product Manual PMA (Power Meter Application)

Revision: 08/02/11

- 34 -

Graph of frequency response below.

The frequency response (RSP) annunciator will appear when response correction is on as shown below. The
frequency response correction button on the toolbar can be toggled on/off. The response feature can also be enabled
from the

Offsets & Response

menu.

Impedance Matching

The sensor normally provides a 50-ohm impedance match at the input (default). However, you can switch to the 75-
ohm MLP (minimum loss pad) from the

Offsets & Response

menu shown below. The display will indicate “75ohm-

MLP” if selected.

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Содержание USB PowerSensor+ LB A Series

Страница 1: ...LBXXXA Series USB PowerSensor Product Manual PMA Power Meter Application Revision 08 02 11 1 Product Manual for the POWER METER APPLICATION MODELS LB478A 479A 480A 559A 579A 589A 679A 680A...

Страница 2: ...MEASUREMENTS 12 Zeroing and Reference Power Calibration 12 Setting the Center Frequency 12 Display Preferences and Measurement Units 13 Measurement Resolution 14 Instrument Preset 14 Making an Averag...

Страница 3: ...hazard that could completely damage the product Do not continue until you fully understand the meaning A CAUTION indicates a potential hazard that could partially damage the product Do not continue un...

Страница 4: ...al source Trigger IN OUT or Recorder OUT connectors in addition to a variety of RF input connectors Please refer to the Options section of this document for a complete listing of product options to in...

Страница 5: ...is 4 75 V minimum How to identify the type of USB port The PowerSensor requires your computer to have USB 2 0 port s for correct operation You can identify what type of USB port you have using the fol...

Страница 6: ...Manufacturing o Maintenance Repair Installation and Service o Communications o Radar Wireless Satellite Radio Links Accessories Supplied The product is shipped with the following items 1 A sensor wit...

Страница 7: ...GHz functional to 10 GHz 1 15 1 35 to 20 dBm Yes No LB479A CW Wide Dynamic Range PowerSensor 01 8 0 GHz functional to 10 GHz 1 09 1 60 to 20 dBm Yes No LB480A Pulse Profiling Wide Dynamic Range Power...

Страница 8: ...h an SMA male however an SMA connector cannot be replaced with Type N Field replacement of the connector voids calibration and should only be done where calibration is not required Service There are n...

Страница 9: ...indows 2000 SP2 or greater Windows XP and Windows 7 operating systems with version 4 5 LB software Support is available for various test development environments including MS Visual Basic 6 0 MS Visua...

Страница 10: ...rface for demonstration purposes throughout this document You may not have the LB480A sensor but the interface is common to all models in the power meter configuration The GUI comes up by default in t...

Страница 11: ...ake longer to respond to mouse clicks and data entry as the measurement rate is increased Addressing the Sensor The Set Address facility allows the address of the sensor s to be assigned from 1 to 255...

Страница 12: ...design of the power sensor does not require zeroing or power calibration and there is no provision for zeroing or calibration NOTE While zeroing is not required for any LadyBug sensor the LB5XXA senso...

Страница 13: ...er and frequency from the Display menu as shown below There are selections for digital or analog presentations of frequency and power an analog frequency scale and an analog power scale You can switch...

Страница 14: ...a thousandth of a measurement unit Frequency is selectable in MHz or GHz ranges Instrument Preset The Preset button returns the unit to the following default state Mode CW Frequency 1 GHz Frequency un...

Страница 15: ...del number 2 Setup the GUI to receive the RF source input as shown below including the power and frequency units All parameters shown can be disabled for this example except for Triggering option 003...

Страница 16: ...parameters shown can be disabled for this example except for Triggering option 003 which should be set to continuous and internal Select Measurement Pulse Power or activate the Pulse button on the too...

Страница 17: ...cle will remain unchanged The LB479A can measure 350 nsec pulses at 55 dBm and lower with a PRF of 1 kHz or lower Such measurements require averaging to be set between 5000 and 10000 Alternate Pulse M...

Страница 18: ...ing the following parameters as shown below Select Measurement CW Power or activate the CW button on the toolbar not required for LB5XXA Select Offsets Response Duty Cycle Setup Enter 10 Select Offset...

Страница 19: ...r an errant measurement has been made This makes the transition between any two ranges a point of potential discontinuity or hysteresis As a result minor differences in the calibration between the two...

Страница 20: ...to 6 dB and turn the auto criteria on and off you will be toggling between 3 dB and 6 dB below peak This can also give you some sense of rise time or slope and the sensitivity to this criteria Pulse c...

Страница 21: ...ges While peak measurement results can be obtained as low as 60 dBm and at rates as fast as 3 MHz with pulse widths less than 250 nsec the best measurements require some care For best results you can...

Страница 22: ...ult We happen to know in our case that this pilot tone has a PRF of about 9 7 Hz and a duty cycle of less than 1 With these settings the measurement is likely to be very unstable It may bounce wildly...

Страница 23: ...d Averaging When the dialog box appears perform the following Enable Extended Averaging check box Averages enter 500 Click the OK button After just a few measurements you should see the readings stabi...

Страница 24: ...adjustment was fairly simple Pulse Power W Average Power W Duty Cyle But this assumes a perfect pulse and no power during the off time We can use this relationship to check the validity of our previou...

Страница 25: ...25 bits of transmitter inactivity out of 156 25 bits total The transmitter is then active or transferring data within 0 928 92 8 of a time slot 156 25 11 25 156 25 0 928 of a slot The duty cycle of t...

Страница 26: ...Duty Cycle Trigger Out Recorder must be enabled for functionality from either the menu or the toolbar Since most menu functions are also accessible from the toolbar we will proceed directly to an expl...

Страница 27: ...and power level More averaging may be required for low level signals Increasing the number of averages also increases the measurement time Extended Averaging Set enable reset extended averaging from...

Страница 28: ...a sheet for parameters Trigger Out Standard and Optional TTL compatible The trigger menu and toolbar button will not appear for the LB478A 479A or LB5XXA if option 003 is not installed See data sheet...

Страница 29: ...This function is reset by the front panel button labeled Rst Max XAvg This button resets or restarts both max hold and extended averaging You can set reset and enable extended averaging from the drop...

Страница 30: ...that is employed for the particular modulation bandwidth either narrow or wide Normally the sampling is 500 kHz As the baseband signals approach the Nyquist criteria realistically about 200 kHz in thi...

Страница 31: ...ency Response Correction further on in this section The following example uses an attenuator to demonstrate the offset feature 1 Connect the sensor and start the application 2 Set the frequency of int...

Страница 32: ...button on the toolbar The REL annunciator will appear and the power units will change to dB relative as shown below Click the Set Ref button below the display to establish the 0 dB reference point 3 Y...

Страница 33: ...xpressed in dB and the frequency is expressed in Hz The interpolation is linear with respect to frequency and dB The Response setup allows up to 201 points to be entered The response points are freque...

Страница 34: ...as shown below The frequency response correction button on the toolbar can be toggled on off The response feature can also be enabled from the Offsets Response menu Impedance Matching The sensor norm...

Страница 35: ...ll look for a negative edge instead of a positive edge and begin the measurement when a negative edge is detected There is provision for setting a timeout period for an external trigger input up to 30...

Страница 36: ...tion Revision 08 02 11 36 The toolbar trigger drop down shown below works in conjunction with the triggering configurations just described It allows the user to conveniently switch between internal ex...

Страница 37: ...ve to specify the power levels and they are used to specify the scale for interpolation That is if the units are logarithmic dBm dBuV etc the interpolation between 0 VDC and 1 VDC will be with respect...

Страница 38: ...d data to file by checking the appropriate box Once a valid path file has been established select Measurement Logger Enabled to start logging data The recorder will start graphing from 0 to 300 readin...

Страница 39: ...f tabular data saved to file is shown below when in pulse power mode The file will indicate date time frequency and offsets in addition to the measured values with time stamp NOTE There is a separate...

Страница 40: ...a single line The value can be below equal to or above this line and you may specify any of these conditions as pass or fail The second type of limit is a double line The value can be equal outside th...

Страница 41: ...ve display below when the measurement limits have been enabled The annunciator will be OFF when not enabled and if the limits are indeterminate the annunciator will indicate Ind Select Display Limits...

Страница 42: ...st of the following error terms 1 Mismatch 2 Calibration factor 3 Linearity 4 Noise 5 Temperature 6 Zero Offset A root sum of the squares RSS uncertainty computation of these error terms yields an ove...

Страница 43: ...ror correction and eliminates the need to zero the sensor Additionally no separate power reference calibration is required which reduces system errors and increases overall accuracy A high degree of t...

Страница 44: ...Functional Block Diagram A block diagram is shown below and is representative of the PowerSensor line of products Notice that the Trigger Input and Recorder Output options are mutually exclusive and s...

Страница 45: ...to LB480A Quick Start Guide for the Pulse Profile Application under Measurements Specific to the LB480A Rev Date 04 15 08 1 Style change to headings 2 Correct install procedure step 22 Rev Date 06 16...

Страница 46: ...Date 04 09 09 1 Change Average Power to CW Power when referenced in the measurement setups that were not corrected previously 2 Add Zero Offset error term to Measurement Accuracy section as per data s...

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