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Probe current voltage pin 420*4450 head diameter 5.0 over current current and voltage pin TP-IP4220CZ6 5V 0.35PF breakdown voltage 6V SOT Filter 18.432M 
The inputs are forward (VFIN) and reverse (VRIN) voltages and are used as routine checks for standing wave ratios. At 40 mA, the ±15 VDC power supply needs to be adjusted. The article gives details and adjustments of important resistors during calibration.
November 14, 2024