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24 Chapter 1
Signal Generator Overview
Rear Panel
25. SMI (SOURCE MODULE INTERFACE)
This interface is used to connect to compatible Agilent Technologies 83550 Series mm-wave source
modules.
26. 10 MHz OUT
This female BNC connector outputs a nominal signal level of > +4 dBm and has an output impedance of
50Ω. The accuracy is determined by the timebase used.
27. 10 MHz IN
This female BNC connector accepts an external timebase reference input signal level of >−3dBm. The
reference must be 1, 2, 2.5, 5, or 10 MHz, within ±1 ppm. The signal generator detects when a valid
reference signal is present at this connector and automatically switches from internal to external reference
operation. The nominal input impedance is 50Ω. For Option UNR, this BNC connector accepts a signal with
a nominal input level of 5 ±5 dBm. The external frequency reference must be 10 MHz, within ±1 ppm. The
nominal input impedance is 50Ω with a damage level of ≥ 10 dBm.
28. 10 MHz EFC (Option UNR)
This female BNC input connector accepts an external dc voltage, ranging from −5 to +5V, for electronic
frequency control (EFC) of the internal 10 MHz reference oscillator. This voltage inversely tunes the
oscillator about its center frequency approximately −0.0025 ppm/V. The input resistance is greater than
1MΩ. When not in use, this connector should be shorted using the supplied shorting cap to assure a stable
operating frequency.