V4: Emitted power and pulse width

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(Created page with "== Purpose == Check of the control signals and of the emitted pulse of the Modulator, IF and Interface unit (MII). == Remarks == The procedure can also be found in the Fac...")
 
 
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== Purpose ==
 
== Purpose ==
  
Check of the control signals and of the emitted pulse of the Modulator, IF and Interface unit (MII).
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This procedure allows to measure the emitted power and the pulse width. The emitted power is a determining factor for the measurement range and it should always be within the tolerances around the nominal value.
  
  
 
== Remarks ==
 
== Remarks ==
  
The procedure can also be found in the Factory Test Procedure.
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* This procedure contains measurements at high power radiation. Experience and careful handling is absolutely necessary!
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* The procedure has been tested for a lap-3000. For other models, it is referred to the documentation.
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* This procedure can also be found in the Factory Acceptance Test.
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== Material ==
 
== Material ==
  
* RF cables (RG58 type) with BNC and N connectors
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* Male and female SMA, BNC and N adapters
* Oscilloscope (2 channels, bandwidth > 100 MHz)
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* 50Ω loads
* Logic timing diagram of your wind profiler (for lap-3000 [[Media:SchemaLogicTimingVaisala.png]])
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* Attenuators (for example: 20 dB, 0 - 2 GHz, 5 kW peak power, 80 W average power)
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* Directional coupler (for example: 10 kW peak power, 200 W average power, 950 - 2000 MHz)
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* RF cable (type RG58)
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* Power meter with power sensor (>30 MHz bandwidth)
  
  
 
== Procedure ==
 
== Procedure ==
  
# Terminate the TRANSMIT OUTPUT port with a 50Ω load
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# Connect the the power meter to the wind profiler as illustrated here:[[Media: SchemaPowerVaisala.png]] and [[Media: PicturePowerVaisala.png]]
# Start acquisition and press PAUSE
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# Start acquisition using the following configuration file: [[Vaisala Configuration File]]
# Connect channel 1 of the oscilloscope to TX
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# Press PAUSE in the acquisition software
# Measure pulse width and inter pulse period (IPP)
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# Read the pulse width and the peak power value from the power meter
# Connect channel 2 of the oscilloscope to SMPL
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# Convert the peak power to Watts with this formula: peak power (W) = 10^[peak power (dBm) + attenuator loss - 30 dB]. It shoud be >450 W (lap-3000)
# Measure the delay
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# Measure the time (spacing) between two sample pulses (ch2)
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# Measure the total time of the sample pulses (sample period) and the number of sample pulses
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# Connect channel 2 of the oscilloscope to BLANK
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# Measure the period of blanking before and after the TX pulse
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Back to [[Maintenance Procedures]]; Go to [[RWP Maintenance in CWINDE]];
 
Back to [[Maintenance Procedures]]; Go to [[RWP Maintenance in CWINDE]];

Latest revision as of 00:53, 22 November 2013

Contents

[edit] 1 Purpose

This procedure allows to measure the emitted power and the pulse width. The emitted power is a determining factor for the measurement range and it should always be within the tolerances around the nominal value.


[edit] 2 Remarks

  • This procedure contains measurements at high power radiation. Experience and careful handling is absolutely necessary!
  • The procedure has been tested for a lap-3000. For other models, it is referred to the documentation.
  • This procedure can also be found in the Factory Acceptance Test.


[edit] 3 Material

  • Male and female SMA, BNC and N adapters
  • 50Ω loads
  • Attenuators (for example: 20 dB, 0 - 2 GHz, 5 kW peak power, 80 W average power)
  • Directional coupler (for example: 10 kW peak power, 200 W average power, 950 - 2000 MHz)
  • RF cable (type RG58)
  • Power meter with power sensor (>30 MHz bandwidth)


[edit] 4 Procedure

  1. Connect the the power meter to the wind profiler as illustrated here:Media: SchemaPowerVaisala.png and Media: PicturePowerVaisala.png
  2. Start acquisition using the following configuration file: Vaisala Configuration File
  3. Press PAUSE in the acquisition software
  4. Read the pulse width and the peak power value from the power meter
  5. Convert the peak power to Watts with this formula: peak power (W) = 10^[peak power (dBm) + attenuator loss - 30 dB]. It shoud be >450 W (lap-3000)



Back to Maintenance Procedures; Go to RWP Maintenance in CWINDE;

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