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If, instead, the softkey for channel 1 had been set to 3P-4W-3M, then channels 1 through 3
would equate to lines 1 through 3, respectively, as shown below.
On the PA2201A, the wiring diagram only shows two channels, as shown below.
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Keysight IntegraVision PA2200 Series Power Analyzers Operating and Service Guide