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Agilent Technologies PN 8510-16 manual

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Table of contents for the manual

  • Page 1

    Agilent PN 8510-16 Controlling T est Port Output Power Flatness Product Note UNCORRECTED POWER CORRECTED POWER OUTPUT POWER Agilent 8510C Network Analyzer[...]

  • Page 2

    2 Introduction Designers and manufacturers of active devices oft en need to control the pow er lev el at the t est port 1 of t heir pow er -sensitive devices, but f ind dif- ficulty in o vercoming inser tion losses. The insertion losses occur as a result of connecting components in the measurement pat h between the source and the DUT . The A gilent[...]

  • Page 3

    3 System Configuration The basic 8510C measurement system conf igura- tion needed for test por t f latness correction is sho wn in Figure 1. A sing le channel pow er meter such as the A gilent 437B, E4418A, or E4418B is required, along with a compatible sensor , for per- forming t he po wer f latness calibration. Po wer meters with t he 437B comman[...]

  • Page 4

    4 Flatness-Correction Operation The basic setup procedure t o obtain f lat t est port output po wer is illustrated in Table 1. To simplify the execution of t he procedure, t he front panel hardk eys are enclosed in [brackets]. The sof tkeys are enclosed in {braces}. Table 2 pro vides t he pro- cedure for setting up the pow er meter . The net- w ork[...]

  • Page 5

    5 T able 1. Flatness-correction calibration procedure 8510C Keystrokes Description Set up the power meter (see T able 2) For proper operation, the E4418B must be set up before initiating the flatness-correction routine. See T able 2 for specific instructions. V erify the power meter's address on the 8510 system [LOCAL] When shipped from the fa[...]

  • Page 6

    6 T able 2. Agilent E4418B power meter setup E4418B Keystrokes Description Preset and zero the power meter [PRESET/LOCAL] Return the power meter to a known state. {CONFIRM} [ZERO/CAL] {ZERO} Set up the 437B emulation on the power meter [SYSTEM/INPUTS] The 437B command set must be activated in order to perform the power flatness calibration. Power m[...]

  • Page 7

    7 The follo wing er ror messages may occur while attempting t o enable the f latness cor rection and/or reducing the test por t pow er level: • If f latness cor rection is enabled before reducing the test por t pow er level, IF Overload or Source 1 W arning—RF Unleveled ma y be display ed on the analyzer as the source becomes unlev eled. U nlev[...]

  • Page 8

    8 V erifying a flatness-correction calibration T o verify t he f latness-correction calibration, t he po wer sensor should be reconnected t o the t est port t o measure the t est por t po wer at individual frequencies. Since the measurement system is calibrated in 50W , inaccuracies will occur when a device is not well mat ched. Since the f latness[...]

  • Page 9

    9 Using test port 1 calibrations on test port 2 In most cases, port 1 will be t he input por t of t he DUT . When por t 2 must be used as the input por t to t he device, t he user may choose to use a por t 1 f latness-cor rection calibration on por t 2 since the port 1 and por t 2 signal pat hs are symmetrical. 1 Figure 3 illustrates t he use of po[...]

  • Page 10

    10 Practical Application Examples Absolute output power measurements with flatness correction One benefit of t he f latness-correction capability is the ability t o measure the absolute output pow er of active devices. Since the input pow er level to t he DUT is kept constant, t he magnitude of fset feature of the A gilent 8510 can be used to displ[...]

  • Page 11

    11 Amplifier measurement example Step-by-step instr uctions for setting up and apply- ing f latness cor rections for t he measurement of an amplifier are sho wn in Table 7 . Gain, absolute output po wer , and gain compression measurements procedures are cov ered. For more information on measuring amplifiers, refer to A gilent product not e 8510-18,[...]

  • Page 12

    Agilent T echnologies’ T est and Measurement Support, Services, and Assistance Agilent Technologies aims to maximize the value you receive, while minimizing your risk and problems. W e strive to ensure that you get the test and measurement capabilities you paid for and obt ain the suppor t you need. Our ext ensive suppor t resources and services [...]