The keysight CX1203A Sensor Head is
furnished with the CX1101A and CX1102A Current Sensors. It provides an SMA
connector for ammeter + and - terminals of a CX3300 analog channel through a
current sensor. Also provides built-in series 0 Ω and 50 Ω and the switch. The
– (minus) terminal is connected to the circuit common by a 10 MΩ resistor.