Rubidium Frequency Standard - FS725

10 MHz and 5 MHz outputs 20 year aging less than 0.005 ppm Ultra low phase noise (<-130 dBc/Hz at 10 Hz) Built-in distribution amplifiers 1 pps input and output RS-232 computer interface FS725 Rubidium Frequency Standard The FS725 integrates a rubidium oscillator (SRS model PRS10), a low noise universal AC power supply, and distribution amplifiers in a compact half-width 2U chassis. It provides stable and reliable performance, with an estimated 20 year aging of less than 5 × 10 -9 and a demonstrated rubidium oscillator MTBF of over 200,000 hours. The FS725 is an ideal instrument for calibration and R&D laboratories, or any application requiring a precision frequency standard. ... click for FS725 Tech Support FS725 Software Download Single Rack Mount Drawing Double Rack Mount Drawing 3D Step File FS725 Volatility Statement FS740 GPS Frequency Std. PRS10 Rb Oscillator FS735 Distribution Amplifier RF Signal Generator FS725 Software Download Single Rack Mnt. Dwg. Double Rack Mnt. Dwg. 3D Step File FS725 Volatility Statement FS740 GPS Freq. Std. PRS10 Rb clock FS735 Distr. Amp. SG380 RF Sig. Gen. FS725 10 MHz Rb Frequency Standard FS725 Rb Frequency Std. There are two 10 MHz and one 5 MHz outputs with exceptionally low phase noise of (-130 dBc/Hz at 10 Hz offset) and one second Allan Variance of (<2 × 10 -11 ) . The FS725 can be phase-locked to an external 1 pps reference (like GPS) providing Stratum 1 performance. A 1 pps output is also provided that has less than 1 ns of jitter, and may be set with 1 ns resolution. X FS725 Single Sideband Phase Noise FS725 FS725 Single Sideband Phase Noise Up to three internal distribution modules can be added to the FS725. Each module has four 10 MHz outputs, one 5 MHz output, and one 1 pps output, all with the same low phase noise, harmonic distortion and jitter. An RS-232 interface allows direct communication with the rubidium oscillator. Using the provided Windows software, you can easily monitor and control 1 pps timing, and determine the instrument's operational status. There are two alarm relays that indicate the status of the rubidium oscillator lock state and synchronization to an external 1 pps input. The relays are SPDT, providing both normally-open and normally-closed contacts . FS725 Specifications 10 MHz sine, 5 MHz sine, 1 pps pulse (10 µs wide) 1 pps pulse amplitude 2.5 V into 50 Ω, 5 V into high-impedance loads <-130 dBc/Hz (10 Hz) <-140 dBc/Hz (100 Hz) <-150 dBc/Hz (1 kHz) <-155 dBc/Hz (10 kHz) <-100 dBc (100 kHz BW) Accuracy at shipment Aging (after 30 days) <5 × 10 -11 <2.5 × 10 -11 (at shipment) with opt. C Short term stability (Allan variance) <2 × 10 -11 (1 s) <1 × 10 -11 (10 s) <2 × 10 -12 (100 s) 72 hour Stratum 1 level (1 × 10 -11 ) ±5 × 10 -11 (72 hrs. off, then 72 hrs. on) ±2 × 10 -9 (0 to 5 VDC) ±0.5 ppm (via RS-232)