86108B Precision Timebase
The precision timebase is an alternate timebase source for the instrument. Normally, an external trigger is required to synchronize data samples with the input waveform. As an alternative, the precision timebase provides a stable reference clock that is synchronous to the input signal thus providing a reference for time calculations. This improves jitter performance and timebase linearity. Sampling is random and the precision timebase precisely identifies the timing of each random sample. You can select between an internal timebase or you can provide either a full or sub-rate reference clock via the front panel. The external time reference must be as clean of a sine wave as possible. Some internal filtering is provided within certain bands.