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我也有些lpro，印象中是有二种跳线方式，当时有个不能锁定的，换了另一种方式就锁定了，抽出时间对比看下是否和图片上的一致。对就是c901，铷泡边上的可调电容，最好用无感改锥调，同时监测铷灯电压。
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我很少测试bite来判定rb是否锁定，我通常都是加电1h后测试输出频率，大部分rb精度在-9量级。我刚才查了手册“once the lpro is plugged in and is receiving power, wait 3 to 4 minutes while the unit achieves
atomic lock. during this period, the monitored bite signal should be high (4.2 vdc to 4.8 vdc).
once the unit achieves atomic lock, the bite signal goes low (<50mv with respect to gnd). at
this point, the output frequency should be approximately ±5e-8 of absolute frequency.”，看到bite刚锁定时精度只有5e-8。
