RS PRO 123-6460, Quick Start Manual

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1. Counter
BNC connector. The input impedance is 1MΩ. This connector is used to accept the signal measured by the frequency counter.
2. Aux In/Out
BNC connector. The function of this connector is determined by the current work mode of the instrument.
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Sweep/Burst trigger signal input port of external trigger.
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Sweep/Burst trigger signal output port of internal/manual trigger.
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Burst gating trigger input port.
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ASK/FSK external modulation signal input port.
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Synchronization output port. When synchronization is on, the port can output a CMOS signal with the same frequency as basic waveforms (except Noise and DC),
arbitrary waveforms, and modulated waveforms (except external modulation).
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AM, DSB-AM, FM, PM and PWM external modulation signal input port.
3. 10MHz Clock Input / Output Port
BNC connector. The function of this connector is determined by the type of the clock source.
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If the instrument uses internal clock source, the connector outputs the 10MHz clock signal generated by the crystal oscillator inside the generator.
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If the instrument uses external clock source, the connector accepts an external 10MHz clock source.
4. Earth Terminal
Used to ground the instrument.