srs FS725-10 MHz Rb frequency standard

srs FS725-10 MHz Rb frequency standard

主要指标与说明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.

FS725 Rubidium Frequency Standard10 MHz and 5 MHz outputs20 year aging less than 0.005 ppmUltra low phase noise(<-130 dBc/Hz at 10 Hz)Built-in distribution amplifiers1 pps input and outputRS-232 computer interfaceFS725 Rubidium Frequency StandardThe 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.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.FS725 Single Sideband Phase NoiseUp 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 1pps input. The relays are SPDT, providing both normally-open and normally-closed contacts. FS725 Rubidium Frequency StandardOutputOutput frequencies 10 MHz sine, 5 MHz sine, 10 μs wide 1 pps pulseAmplitude 0.5 Vrms, ±10 %1 pps pulse amplitude 2.5 V into 50 Ω, 5 V into high-impedance loadsPhase noise (SSB) <-130 dBc/Hz (10 Hz)<-140 dBc/Hz (100 Hz)<-150 dBc/Hz (1 kHz)<-155 dBc/Hz (10 kHz)Spurious <-100 dBc (100 kHz BW)Harmonics <-60 dBcAccuracy at shipment ±5 × 10-11Aging (after 30 days) Monthly <5 ×10-11 (<2.5 ×10-11 with opt. C) Yearly <5 × 10-10 20 years (typ.) 5 × 10-9Short term stability (Allan variance) <2 × 10-11 (1 s)<1 × 10-11 (10 s)<2 × 10-12 (100 s)Holdover 72 hour Stratum 1 level (1 × 10-11)Frequency retrace ±5 × 10-11 (72 hrs. off, then 72 hrs. on)Settability <5 × 10-12Trim range ±2 × 10-9 (0 to 5 VDC)±0.5 ppm (via RS-232)Warm-up time <6 minutes (time to lock)<7 minutes (time to 1 × 10-9)

Front-Panel Indicators (Green LEDs)Power "On" when AC power is appliedLocked "On" when frequency is locked to rubidium1 pps input Blinks with each 1 pps reference input applied to rear panel1 pps sync "On" when 1 pps output is synchronized within ±1 μs of 1pps inputReceive Blinks when RS-232 characters are received by FS725Send Blinks when RS-232 characters are sent by FS725Rear-Panel ConnectionsFrequency adjust 0 to 5 VDC adjusts frequency by ±0.002 ppm (normally unconnected)1 pps input One 100 kΩ input. Requires CMOS level pulses (0 to 5 VDC). If an external 1 pps input is applied, lock is maintained between the 1 pps input and 1 pps output with computer adjustable time constant from 8 minutes to 18 hours.10 MHz outputs Two 50 Ω isolated sine outputs5 MHz output One 50 Ω sine output1 pps output One 50 Ω pulse outputOptional outputs Each option board provides four 10 MHz, one 5 MHz and one 1 pps outputs. Up to 3 boards can be installed.Alarm relays Max. current, 3 A. SPDT, normally open or normally closed. May be wired in parallel with other relays to "wire-or" a single alarm.Rb lock Relay status matches the front-panel "Locked" LED.1 pps Relay status matches the front-panel "1 pps sync" LEDRS-232 9-pin connector configured as DCE, 9600 baud. Windows RbMon software is provided.EnvironmentalOperating temperature +10 °C to +40 °CTemperature stability Δf/f < ±1 × 10-10 (+10 °C to +40 °C)Storage temperature -55 °C to +85 °CMagnetic field Δf/f < 2 × 10-10 for 1 Gauss field reversalRelative humidity 95 % (non-condensing)

GeneralAC power 90 to 132 VAC or 175 to 264 VAC, 47 to 63 Hz, 50 WDimensions 8.5" × 3.5" × 13" (WHL)Weight 9 lbs.Warranty One year parts and labor on defects in materials and workmanship

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