Stanford PRS10 Rubidium Frequency Standard
PRS 10 Rubidium Frequency Standard (Distributed only in Germany.)
| Output | |
| Output frequency | 10 MHz sine wave |
| Amplitude | 0.5 Vrms, ± 10 % (approx. 1.41 Vpp or + 7 dBm) |
| Phase noise (SSB) | <-125 dBc/Hz (10 Hz) <-140 dBc/Hz (100 Hz) |
| Spurious | <-130 dBc (100 kHz B.W.) |
| Harmonic distortion | <-40 dBc |
| Return loss | >25 dB @ 10 MHz |
| Accuracy at shipment | ± 5x10-11 |
| Aging (after 30 days) | <5x10-11 (monthly) <5x10-10 (yearly |
| Short term stability | <1x10-11 (1 s) |
| Allan variance | <1x10-11 (10 s) <2x10-12 (100 s) |
| Frequency retrace | ±5x10-11 (72 hrs off then 72 hrs on) |
| Settability | <5x10-11 |
| Trim range | ±2x10-9 (0 to 5 VDC) ± 1 ppm (via RS-232) |
| Warm-up time | <5 minutes (time to lock) <6 minutes (time to 1x10-11) |
| Voltage sensitivity | <2x10-11 for a 1 VDC supply change |
| Electrical | |
| Input voltage | +24 VDC (nom.), +22 VDC (min.), +30 VDC (max.) |
| Current | 2.2 A (warmup), 0.6 A (steady-state) at 25 °C |
| Protection | ±30 VDC to any pin except rf output |
| RF protection | 100 mA (stable with any termination) |
| Cal reference out | 5.00 ± 0.05 VDC |
| RS-232 | 9600 baud, 8 bits, no parity, 1 stop bit, 0 to 5 volt levels with x-on/x-off protocol |
| 1 pps measurement | ±10 ns (accuracy), ±1 ns (resolution) |
| 1 pps output set | ±10 ns (accuracy), ±1 ns (resolution) |
| Environmental | |
| Operating temp | -20 °C to +65 °C baseplate |
| Temp coefficient | ±5x10-11 (-20 °C to +65 °C baseplate) |
| Storage temperature | -55 °C to +85 °C |
| Magnetic field | <2x10-10 for 1 Gauss field reversal |
| Relative humidity | 95 % (non-condensing) |
| Miscellaneous | |
| Customer AQL1 | 0.26 % |
| Customer MTBF1,2 | 1,600,000 hrs |
| Design life3 | 10 yrs |
| Size | 2.00 " x 3.00 " x 4.00 " (HWL) |
| Weight | 1.32 lbs |
| Baseplate threads | 4-40 (4 places) |
| Connector | Mates with ITT/Cannon DAM11W1S series |
| Warranty | Two year parts and labor on materials and workmanship. |
1. Preliminary estimates for customer acceptance quality level (AQL) and mean time between failures (MTBF) are based on data from 750 units delivered over a 12 month period to a telecom equipment manufacturer. Two units of the 750 were returned following incoming inspection and environmental testing. Not all specifications were tested by the customer.
2. This MTBF represents a single unit failure in a lot of 748 units with a mean operating time of 90 days. In this customer's application, any ``unlock event" is considered a failure, and the unit is removed from service. Other failures, which are not relevant to this customer's application, may not be detected.
3. Lamp lifetime is the dominant consideration in the design life estimate. The estimate is based on the measured reduction of lamp intensity and the elevation of lamp start voltage with time.
