24 Keysight EXG and MXG X-Series Signal Generators User’s GuideModels, Options, and Front/Rear Panels for All ModelsRear Panel Overview (N5171B, N5172B, N5181B, & N5182B)2. EXT 1 & EXT 23. LF OUT4. SWEEP OUT5. PULSE6. TRIG 1 & 27. REF INIn its factory default mode, the signal generator can detect a valid reference signal at thisconnector and automatically switch from internal to external reference operation. See “Returningto a Known State with the Preset Key” on page 56. With Option 1ER (flexible reference input), youmust explicitly tell the signal generator the external reference frequency you wish to use; enter theinformation through the front panel or over the remote interface.Connector female BNC Impedance nominally 50 ΩSignal An externally supplied ±1 V p signal that produces the indicated depth.Damage Levels 5 V rms and 10 VpConnector female BNC Impedance 50 ΩSignal Voltage range: 0 to +5 VpOffset: -5 V to +5 V, nominalFor more information, see page 137.Connector female BNCCan drive 2 kΩ.Impedance <1 ΩSignal Voltage range: 0 to +10 V, regardless of sweep widthIn swept mode: beginning of sweep = 0 V; end of sweep = +10 VIn CW mode: no outputThis is a multiple use connector. For signal routing selections, see pages 63 and 135.Connector female BNC Impedance nominally 50 ΩSignal Externally supplied: +1 V = on; 0 V = offThis can also serve as a burst envelope input: 0V = 100% amplitude, –1.00V = 0% amplitudeDamage Levels ≤ −0.3 and ≥+5.3 VConnector female BNC Impedance high ZSignal An externally supplied TTL or CMOS signal for triggering operations, such as point to point inmanual sweep mode or an LF sweep in external sweep mode.Triggering can occur on either the positive or negative edge.Damage Levels ≤ −0.5 and ≥+5.5 VConnector female BNC Impedance nominally 50 ΩSignal An externally supplied −3.5 to +20 dBm signal from a timebase reference that is within ±1 ppm.
