| Option model | STD | 30 | 40 |
| Time base type: | TCXO | OCXO | OCXO |
| Uncertainty due to:-Aging per 24h per month per year-Temperature variations: 0˚C to 50˚C 20˚C to 26˚C (typ. values) | n/a <2x10-7 (typ.) <1x10-6 <5x10-7 not specified | <5x10-10 (1) <1x10-8 <5x10-8 <5x10-9 <1x10-9 | <3x10-10 (1) <3x10-9 <1.5x10-8 <2.5x10-9 <4x10-10 |
| Short-term stability: τ =1s (root Allan Variance) τ =10s | <1x10-9 (typ.) | <1x10-11 <1x10-11 | <5x10-12 <5x10-12 |
| Power-on stability:Deviation vs. final value after 24 h on time, after a warm-up time of: | <1x10-6 5 min | <1x10-8 10 min | <5x10-9 10 min |
| Typical total uncertainty, for operating temperature 20˚C to 26˚C, at 2σ (95%) confidence interval: -1 year after calibration -2 years after calibration | <1.2x10-6 <2.4x10-6 | <6x10-8 <1.2x10-7 | <1.8x10-8 <3.5x10-8 |