Rubidium Frequency Standard - SIM940
SIM940
Three 10 MHz outputs 1 pps input & output for GPS sync 20 year aging less than 0.005 ppm Ultra-low phase noise (<-130 dBc/Hz at 10 Hz) 1 pps input & output
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说明
Three 10 MHz outputs 1 pps input & output for GPS sync 20 year aging less than 0.005 ppm Ultra-low phase noise (<-130 dBc/Hz at 10 Hz) 1 pps input & output SIM940 10 MHz Rubidium Oscillator Module The SIM940 integrates a rubidium oscillator (SRS model PRS10) into the SIM900 platform. 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 SIM940 is an ideal instrument for calibration and R&D laboratories or any application requiring a precision frequency standard. Programming Examples SIM Modules PRS10 Rb Oscillator Scientific Instruments SIM Modules PRS10 Rb clock Sci. Instruments SIM940 10 MHz Rb Oscillator There are three 10 MHz outputs with exceptionally low phase noise (-130 dBc/Hz at 10 Hz offset) and one second Allan variance (<2 × 10 -11 ) . The SIM940 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. All functions of the SIM940 can be controlled from a computer via the SIM900 Mainframe. Both RS-232 and GPIB interfaces are supported by the mainframe. SIM940 Specifications 10 MHz sine, 10 µs wide 1 pps pulse 0.5 Vrms (+7 dBm) into 50 Ω 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 (monthly) <5 × 10 -10 (yearly) 5 × 10 -9 (20 years, typ.) 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 remote interface) <6 minutes (time to lock) <7 minutes (time to 1 × 10 -9 ) Front-Panel Indicators (LEDs) Indicates frequency is locked to rubidium Indicates when frequency is unlocked Blinks with each 1 pps reference input applied to rear panel "On" when 1 pps output is synchronized within ±1 µs of 1 pps input Rear-Panel Connections
规格
| 技术参数 | Three 10 MHz outputs |
|---|---|
| 技术参数 | 1 pps input & output for GPS sync |
| 技术参数 | 1 pps input & output |
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