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The HP 8655A Synchronizer/Counter is a phase lock frequency stabilizer that provides HP 8654A and 8654B signal generators with crystal oscillator frequency stability. Thus the generator can attain the drift stability of the counter's time base reference or an external 1 MHz reference. The HP 8655A is also a 1 kHz to 520 MHz frequency counter with very low RF leakage. When used with an 8654 signal generator, frequency can be phase locked over the range of 10 to 520 MHz with special purity preserved. Two 8654/8655A combinations can also be locked together for various intermodulation distortion measurements. FM capability of the 8654B is retained in the locked mode. FM can be added to a locked 8654A by summing a modulation signal with the phase lock signal at the generator's FM input. In phase lock mode, a lock resolution of 500 Hz is possible. In count mode, resolution 1 Hz is attainable in the 1 kHz to 10 MHz range or 100 Hz in the 10 to 520 MHz range.
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