Instruction/ maintenance manual of the product PN 8510-16 Agilent Technologies
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Agilent PN 8510-16 Controlling T est Port Output Power Flatness Product Note UNCORRECTED POWER CORRECTED POWER OUTPUT POWER Agilent 8510C Network Analyzer.
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 .
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.
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}.
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.
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.
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.
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.
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.
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.
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.
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